Locksmith Glossary of Terms
Courtesy of the Lock Industry Standards and Training (LIST) Council
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z#
160 prep
A standard door preparation which consists of a 2-1/8" cross-bore with a 2-3/8" backset, and a 1" edge- bore with a mortise 1" wide and 2-1/4" high
161 prep
A standard door preparation which consists of a 2-1/8" cross-bore with a 2-3/4" backset, and a 1" edge- bore with a mortise 1-1/8" wide and 2-1/4" high
A, AA, AA1, 1AA, etc.
The symbol most commonly used in the standard key coding system to indicate the first grand master key in a key system, see also "key symbol", "keying symbol" and "standard key coding system"
A2
An increment of .0125 typically used in a small format interchangeable core (SFIC)
A3
An increment of .018 typically used in a small format interchangeable core (SFIC)
A4
An increment of .021 typically used in a small format interchangeable core (SFIC)
access control
Any barrier or device, either natural or man made, that limits or prohibits, free or unlimited access
access control cylinder
A replacement for a mechanical cylinder which incorporates electronic access control and allows the original host lock to function without additional wiring or hardware modifications
access control key fob
Any device other than a key designed to allow a token to be used and carried on a key ring
accessory position
The position of an ignition switch intended to permit the use of radio or other equipment without turning on a drive train component
active case
The exit device case mounted on the stile of the door on which the lock is located
active leaf
The single door of a pair on which the active or locking hardware is mounted
active relocking device
A device that places its bolts every time a safe door is closed and activation via attack prevents it from retracting its bolts
active retainer
1. a cylinder retaining mechanism which requires that the plug be rotated before the cylinder can be removed, 2. a plug retaining mechanism which requires that the plug be rotated before the retainer can be removed
active plug retainer
One in which the plug must be turned befor the device may be released or removed
actuator
A device, usually connected to a cylinder, which, when activated, may cause a lock mechanism to operate
ADA
Abb. Americans with Disabilities Act
adjustable ball hinge
A pivot with adjustable height for narrow stile doors
adjustable collar
A spring-loaded cylinder collar which can fill a range of gaps between the cylinder head and the door or escutcheon surface
adjustable mortise cylinder
Any mortise cylinder whose length can be adjusted for a better fit in doors of varying thickness
AED
Abb. anti-explosive device
AFTE
Abb. Association of Firearm and Toolmark Examiners
after hours depository
A locked receptacle for the deposit of items after regular hours
AHC
Abb. Architectural Hardware Consultant (as certified by DHI)
AHD
Abb. after hours depository
AHJ
Abb. authority having jurisdiction
alarm system
A system of electrical and/or electronic components which detect and report dangers, such as fire or intrusion
aligning tube
1. a lock component which orients and joins the latch and knob spindles of certain bored locksets, 2. in some combination locks, a tube which houses the spindle, located between the dial ring and the lock
alignment pin
The perpendicular projection from a master lever in a master keyed lever tumbler lock, which engages a group of combination levers and moves their gates to align with the fence
all-section key blank
The key section which enters all keyways of a multiplex key system
ALOA
Abb. Associated Locksmiths of America, Inc.
Americans with Disabilities Act
A US federal law dealing with minimum standards of building accessibility, as well as other issues concerning individuals with disabilities
angularly bitted key
A key which has cuts made into the blade at various degrees of rotation from the perpendicular
annunciator
An audible and/or visual signaling device
ANSI
Abb. American National Standards Institute
ANSI strike
Any of many strikes designed to fit door and frame preparations as specified in the applicable document in the ANSI A115 series, common usage refers to a strike with dimensions of 4 7/8" X 1 1/4"
ANSI 117.1
That section of the American National Standards Institute documents pertaining to handicap access
anti-friction
Pertaining to a feature which, upon contact with the strike, allows smoother operation of a latch bolt
anti-passback
Of or pertaining to an access control system feature designed prevent consecutive use of a given credential to allow entry by more than one person at a time
anti-punch collar
A two part system installed on a spindle shaft and safe body to prevent the spindle shaft from being punched into the lock case
anti-rap
Specifically designed to preclude bypass via attack based on sharp, repetitive blows to the mechanism
anti slip positioned
Of or pertaining to the orientation of a cam on a profile cylinder which requires rotation before it may be removed from the lock case
anti-wrench reinforcement spring
A lock cylinder spring designed to protect the inner and outer halves of a profile cylinder from being forcibly separated as a means of brute force entry
arbor
The threaded end of a safe door handle
architectural finish code
One of a series of specification codes used to indicate the color and texture of a metal end product that can be installed. Some finish specifications also note the base metal characteristics and processes used to obtain the end product.
architectural hardware
1. fittings applied to protect a surface of, or to facilitate use of movable members in a building such as doors, windows, or cabinets, 2. various fixtures used in building construction
area zoning
The standard of limiting access, or detecting access, in multiple areas smaller than the entire installation
arm (of a closer)
Door closer linkage which connects the closer to the frame or door, depending on the mounting style
armored escutcheon
A usually hardened escutcheon, typically beveled, that resists physical attack
armored face plate
A face plate that conceals all lock and/or cylinder mounting screws
ASIS
Abb. American Society for Industrial Security
assembly occupancy
Those buildings or areas which are designated as places of assembly according to life safety or building codes
associated change key
A change key which is related directly to particular master key(s) through the use of constant cuts
associated master key
A master key which has particular change keys related directly to its combination through the use of constant cuts
ASTM
Abb. American Society for Testing and Materials
astragal
A molding attached to the face of the active leaf of a pair of doors and overlapping the inactive leaf
ATM
Abb. automatic teller machine
ATT
Abb. attendant's key
attack resistance
Design qualities of a product that render brute force physical defeat methods less effective or ineffective
attendant's key
A selective master key used in a hospital keying system
audit overrun
A means of attack designed to eliminate entries in an access control database, overfilling and scrolling off previous entries
audit trail
A specific group of events selected from transaction records and listed sequentially
authority having jurisdiction
That person, usually within a municipality, charged with the application and interpretation of local life safety codes
automatic closing
Pertaining to a door which is equipped with a door closer, or other device to close it without manual intervention. Frequently found in Life Safety and fire code requirements.
automatic deadbolt
A deadbolt designed to extend itself fully when the door is closed
automatic flush bolt
A flush bolt designed to extend itself when both leaves of the pair of doors are in the closed position
automatic key machine
A machine capable of cutting keys with manual operations limited to loading and unloading keys
automatic teller machine
A device for dispensing cash, receiving deposits and performing other banking functions upon presentation of the proper
authorizationauxiliary lock
Any lock installed in addition to the primary lockset
auxiliary spring
A secondary spring used to support the lever handles of a lockset
auxiliary spring rose
Oversized trim that interlocks with a lock chassis and external lever as a means to mount an auxiliary spring
b-t
Abb. bow-to-tip
B label
A classification by Underwriters Laboratories for doors with 1 1/2 hour rated fire protection
back plate
A thin piece of metal, usually with a concave portion, used with machine screws to fasten certain types of cylinders to a door
backcheck
The resistance provided by a door closer as a door is opened
backset
The distance between the center of a cross-bore and the bolt edge of a door or drawer
balance (a combination)
To dial a combination 1 number high and 1 number low to verify a correct combination setting
ball bearing
1. a metal ball used in the pin stack to accomplish some types of hotel or construction keying, 2. a ball, usually made of steel, used by some lock manufacturers as the bottom element in the pin stack in one or more pin chambers, 3. any metal ball used as a tumbler's primary component, 4. used as a means of repairing a drilled hole in a safe when welded in place
ball bearing hardplate
A hardplate that contains metal balls, typically two types, imbedded in a honeycomb pattern, or free moving within a hardplate envelope
ball bearing hinge
A hinge which uses ball bearings between its knuckles to reduce friction
ball catch
A latch which uses spring pressure to force a ball bearing into a recess in its strike
ball check
A spring loaded ball bearing in a door closer arm assembly that acts to limit arm travel
ball locking
A method of locking a padlock shackle into its case using ball bearing(s) as the bolt(s)
barium ferrite card
An access control system credential consisting of magnetized ferrite embedded in a plastic card with polarity and location being important features
barrel bolt
A surface mounted slide bolt which has a cylindrical shape
barrel key
A type of bit key with a hole drilled into the shank from the tip
barrier free
Having to do with the absence of restrictions to access by the handicapped
Barron, Robert
The Englishman credited with the invention of the double-acting lever tumbler in 1778
Basic Building Code
Former name for BOCA National Building Code
battery eliminator
An electric device designed to provide energy to equipment normally requiring batteries for operation
BBC
Abb. Basic Building Code
BCH
Abb. bolt control handle
bell box
The protective enclosure for a bell or other alarm sounding device
Bell type key
A key whose cuts are in the form of wavy grooves milled into the flat sides of the key blade. The grooves usually run the entire length of the blade.
bevel (of a door)
The pitch on the leading edge of a door which allows clearance for closing
evel (of a lock)
The pitch of the face designed to match the bevel of a door. Some locks have an adjustable bevel
bezel
A threaded collar commonly used to secure certain cylinder or lock assemblies
BHMA
Abb. Builders Hardware Manufacturers Association
bible
That portion of the cylinder shell which normally houses the pin chambers, especially those of a key-in-knob cylinder or certain rim cylinders
bicentric cylinder
A cylinder which has two independent plugs, usually with different keyways. Both plugs are operable from the same face of the cylinder. It is designed for use in extensive master key systems
bicycle padlock
A padlock with sufficient shackle clearance to secure a bicycle
bi-directional cylinder
A cylinder which may be operated in a clockwise and counterclockwise direction by a single key
bi-fold door
A door with two or more sets of hinges, the additional set(s) allows the door to have an accordion action when opened
Bilevel capable
Typically a key that can operate two compatible mechanisms which have different security features
binary cut key
A key whose combination only allows for two possibilities in each bitting position: cut/no cut
binary type cylinder or lock
A cylinder or lock whose combination only allows for two bitting possibilities in each bitting position
biometric
Of or pertaining to a lock with a hybrid mechanism, part of the mechanism identifies a physical attribute such as finger print, voice print, etc. while another part is a mechanical mechanism
bit
1. the part of the key which serves as the blade, usually for use in a warded or lever tumbler lock 2. To cut a key
bit height
A measurement from the post of a bit key outward to the end of the bit
bit key
A key with one or more projecting bits
bit thickness
A measurement of the bit from one side to the other side
bit width
As inserted into a lock, a measurement from the leading edge to the trailing edge of a bit
bitting
1. the number(s) which represent(s) the dimensions of the key 2. the actual cut(s) or combination of a key
bitting depth
The depth of a cut which is made into the blade of a key
bitting list
A listing of all the key combinations used within a system. The combinations are usually arranged in order of the blind code, direct code, and/or key symbol
bitting orientation
The specification of how a written combination is to be applied to bitting positions of a key (tip-to-bow, etc.)
bitting position
The location of a key cut
blade
The portion of a key which may contain the cuts and/or millings
blank
Uncut, see also "key blank"
blind code
A designation, unrelated to the bitting, assigned to a particular key combination for future reference when additional keys or cylinders may be needed
block master key
The one pin master key for all combinations listed as a block in the standard progression format
blocking lever
A lever in a safe deposit lock which blocks the renters key from completely entering the lock until the guard key has been inserted and turned
BMK
Abb. block master key
BOCA
Abb. Building Officials and Code Administration International (formerly Basic Building Code)
BOCA National Building Code
The model building code developed and published by BOCA
body
The part of a lock assembly into which all the operating components are mounted, see also case
bolt
Any movable projection which blocks the movement of one object relative to another
bolt control handle
A lever or wheel shaped device on a safe or vault door that is used to extend or retract the boltworks
bolt cup
A thimble shaped device in a safe door frame that a locking bolt extends into when the door is closed and the bolt(s) are extended
bolt head
The part of a bolt that enters a strike
bolt motor
1. a mechanical device that extends and retracts the door bolt(s) of a safe, normally engaged by closing the door and disengaged by a time lock, 2. a mechanical device (usually electrically powered) that extends and retracts the bolt of a safe lock. It is commonly disengaged by an electronic input such as that from a keypad
bolt sensor switch
A switch installed to detect when a lock bolt is extended or retracted
bolt shim
A plate or plates mounted to the frame of a vault to provide equal gapping for each locking bolt
bolt tail
The part of a bolt retained in the lock case that contains the bolt slot and maintains bolt alignment
boltwork button
The component which automatically triggers extension of the locking bolt(s) when the door is in the closed position
boltworks
1. the combination of bars, rods, plates and linkages in a safe door designed to hold the door in the locked or unlocked position depending on the status of the lock itself, 2. any part of a lock other than a cylinder, turnpiece, or operating handle that affects movement of, or the ability to move, the bolt
bond box
The removable container within a safe deposit box compartment
bored lock
A lock for a door prepared with one or more cross-bores and one or more edge-bores
borescope
An internally lighted optical instrument for viewing normally concealed or inaccessible components
boring jig
A tool, temporarily affixed to a door, which provides a template structure to guide drill bits properly when preparing for the installation of specific hardware
bottom of blade
The portion of the blade opposite the cut edge of a single bitted key
bottom pin
Usually a cylindrical shaped tumbler which may be conical, ball shaped or chisel pointed on the end which makes contact with the key
bounce
A method used to open certain safes involving dropping the safe and relying on gravity and inertia to move the bolt and open the safe
bow
The portion of the key which serves as a grip or handle
bow stop
A type of stop located near the key bow
bow to tip
A specification that a bitting combination is recorded starting at the bow and proceeding to the tip
box of wards
A complete unit of intricate wards installed in or on a lock case
box strike
A strike equipped to line the bolt cavity for both aesthetic and protective purposes
brace Lock
A deadbolt lock that engages an independent bolt, one end of which is mounted in the floor away from the door
Bramah, Joseph
The Englishman who had the world's first patent of a locking mechanism in 1784. It was the first lock incorporating a cylinder whose key did not contact the lock bolt directly
Bramah type lock
A lock or cylinder using a mechanism with sliders, normally arranged in a circle
bridge assembly
A removable frame that contains the wheel pack and wheel post that is often found in mechanical vault locks
bridge ward
A center ward attached to the interior of a lock by means of a bracket
broach
1. a tool used to cut the keyway into the cylinder plug 2. v. to cut the keyway into a cylinder plug with a broach
building master key
A master key which operates all or most master keyed looks in a given building
build-up dimension
1. the distance between two different shear lines, as expressed in units of the manufacturer's increment or as an actual measurement, 2. the dimension of the buildup pin required in a particular chamber, which will allow one key to operate at the plug shear line and a different key to operate at a different shear line
build-up pin
The additional element of a pin stack required to allow operation at different shear lines in a cylinder
bullet catch
A friction catch with a projecting latch which is spherical or dome shaped
bump key
A lock picking key with uniform steeples between cuts that is forced further into the lock via impact
burglar alarm
A system designed to detect and report conditions, which may indicate intrusion or attempted intrusion
burglar resistant
Of or pertaining to a security container designed to resist forcible entry for a specified period of time determined by the rating of the container
button knob
The knob in a key-in-knob lock that includes a push or turn button
bypass key
The key which operates a key override cylinder
by-pass tool
A device that neutralizes the security of a locking device, or its application hardware, often taking advantage of a design weakness
by-passing door lock
Alock with a bolt that extends to block parallel movement of another door
by-passing sliding door
Two doors mounted on tracks parallel to each other that when one or both are slid to opposite extremes block the opening. Typically, one may be moved behind the other to allow access
C label
A classification by Underwriters Laboratories for doors with 3/4 hour rated fire protection
cabin-door hook
A U-shaped latch that pivots to encircle a strike projection
cable wired remote relocker
A spring loaded relock, triggered by release of the attached wire
CAL
Abb. the title "Certified Automotive Locksmith" as awarded by ALOA
cam
1. a lock or cylinder component which transfers the rotational motion of a key or cylinder plug to the bolt works of a lock 2. the bolt of a cam lock
cam lock
A complete locking assembly in the form of a cylinder whose cam is the actual locking bolt
CAN
Abb. controller area network
cane bolt
A surface mounted deadbolt designed to be moved by hand via a 90o bend in the bolt that serves as a handle
cap
A spring cover for a single pin chamber 2. n. a part which may serve as a plug retainer and/or a holder for the tailpiece 3. v. to install a cap
capping block
A holding fixture for certain interchangeable cores which aids in the installation of the caps
captains wheel
1. a spoked handle on a safe used to extend or retract the bolts, 2. a spoked handle on a safe used to engage or disengage the pressure system
captured combination bit position
The position where a movable key insert is placed on a key
captured hinge
A hinge system for safes where the door may not be lifted off the body of the safe without the removal of one of the hinge blocks
card access system
An access control system that utilizes a controlled security card as the credential
card holder
A person to whom a card has been issued
card reader
A device which interprets coding resident on or in cards
carriage
1. the movable assembly of a key machine which supports the key vise(s), 2. a changeable part of a clipper that holds the key blank
carry bar
The part of a multi-bolt safe boltworks to which the bolts are attached
case
The housing or body of a lock
case cover
The portion of a lock case which is designed to be removable to allow access to the mechanism
casement window
A window with a sash which pivots or swings to open
case ward
Any ward directly attached to or projecting from a lock case
catch
Any device that holds a door closed and may be released by simply pushing or pulling on the door
CBOK
Abb. construction breakout key
CCW
Abb. Counter Clockwise, as used in combination dialing instructions
central locking
1. a power door lock system in vehicles that allows the simultaneous locking or unlocking of all doors, 2. see "maison keying"
central processing
Of or pertaining to an access control system in which all or most control functions are performed by the main computer
central station
A location designed for the express purpose of processing status signals for multiple alarm systems
certificate of occupancy
A document, granted by the authority having jurisdiction, permitting occupancy or use
chain bolt
A spring biased bolt operated by an attached chain, typically for mounting to the top of a door
chain lock
A device used to secure property with interlocking links and secured on both ends by a slide plate or a key locking device
chamber
Any cavity in a cylinder plug and/or shell which houses the tumblers
change index
The point on a key changeable combination lock dial ring to which the old and new combinations must be dialed when changing the combination
change key
1. a key which operates only one cylinder or one group of keyed alike cylinders in a keying system, 2. any device that is used to mechanically or electronically allow resetting of certain key or combination locks, see also "reset key" #1
changeable bit key
A key which can be recombinated by exchanging and/or rearranging portions of its bit or blade
changeable fence
The fence of a lever tumbler lock composed of multiple segments which may be set to various positions in order to change the combination of the lock
changeable lever
A lever tumbler typically made in two or more pieces which can be variably positioned with each other to change the effective location of the gate
changeable tumbler
A tumbler whose reference size can be changed mechanically without removal from the lock or cylinder
chassis
The part of a cylindrical lockset that contains the actuating mechanism and has a means for mounting trim and a bolt
check pin
A device resembling a bottom pin, found in a non-traditional chamber, used to restrict the rotation of the plug unless a specific area of the key is cut
cheek
A projection from a lock case that serves as a guide or race for another part
chip key
See 'transponder key', 'VATS key' or 'PATS Key'
Chubb shackle
A hinged shackle with a pierced hole for the bolt in its movable end
CIL
Abb. the title "Certified Institutional Locksmith" as awarded by ILA
circular strike
A typically round, finished strike, usually driven into place in a drilled hole
CJIL
Abb. the title "Certified Journeyman Institutional Locksmith" as awarded by ILA
CJL
Abb. the title Certified Journeyman Locksmith as awarded by the Professional Locksmith Association of Alberta
CJS
Abb. the title "Certified Journeyman Safecracker" as awarded by NSO
CK
Abb. change key
cladding
An outer casing, usually metallic, typically filled with concrete to protect a safe against theft or penetration
clamshell
The two piece housing (usually plastic) that encases the upper steering column and ignition lock on some automotive applications
claw bolt
A bolt with one or more fingers, which extend out of the bolt and lock behind the strike as the bolt reaches the locked position
clear opening
A portal providing clearance through which passage is unhampered
clevis
A device to permanently attach a chain to a padlock
clipper
A hand held key bitting punch, often incorporating a trigger-like handle
cloner
A device for reading and writing data to electronic or hybrid keys
closed gated
Pertaining to a lever tumbler whose gate is pierced into the body of the tumbler. The lever(s) surround the fence in both the locked and unlocked positions
closed knob
A knob without an opening in its face
closed loop
A detection circuit where discontinuity in a branch will result in a reportable condition
closer size
A numerical value related to the applied force of a door closer, with a larger number being a stronger force. Older closers were assigned alphabetic size designations, where A was the smallest
closet latch
A latchset which has a turning device with minimum projection in place of the inside knob or lever
closet spindle
A spindle with a thumbturn attached to one end
closing combinated
Pertaining to a lever lock which is automatically combinated to the last key to extend the bolt
cloverleaf cam
A style of mortise cylinder cam with three lobes: a ball shaped longer center, and angular projections on either side
clutch
1. the part of a profile cylinder which transfers rotational motion from the inside or outside element to a common cam or actuator, 2. the feature of a lever handle lockset which allows free movement of the lever when locked, 3. the feature of a cylinder which allows turning the plug without operation of the lock when a certain pressure is applied without the correct key
CMIL
The title "Certified Master Institutional Locksmith" as awarded by ILA
CMK
Abb. construction master key
CMK'd
Abb. construction master keyed
CML
Abb. the title "Certified Master Locksmith" as awarded by ALOA
CMS
Abb. the title "Certified Master Safecracker" as awarded by NSO
CMST
Abb. the title "Certified Master Safe Technician" as awarded by SAVTA
CO
Abb. certificate of occupancy
code
1. a designation assigned to a particular key combination for reference when additional keys or cylinders may be needed. See also, "blind code", "direct code", and "key symbol", 2. a standard for Life Safety, structural integrity, fire safety, etc., either incorporated into the statutes of a given jurisdiction, or a model standard
code key
A key cut to a specific code rather than duplicated from a pattern key. it may or may not conform to the lock manufacturer's specifications
code original key
A code key which conforms to the lock manufacturer's specifications
code series
An ordered sequence of unique codes related to specific key combinations, key sections and manufacturers
coercivity
The measure (usually expressed in Oersteds) of a magnetic material's resistance to being recorded or erased. Magnetic stripe cards are either low coercivity or high coercivity
coining
The process of pressing metal between two dies in order to form a raised image and markings. Generally related to the bow of a key
comb attack
1. a pin tumbler defeat tactic using a series of straight pins or teeth on a single tool, intended to push the pin stack past the shear line, 2. a defeat tactic used to force a spring cover off a pin tumbler cylinder
combinate
To set a combination in a lock, cylinder, or key
combination
The group of numbers which represent the bitting of a key and/or the tumblers of a lock or cylinder
combination lock
A lock which is operated by local input of a specific series or sequence of numbers or letters
combination wafer
A type of disc tumbler used in certain binary type disc tumbler key-in-knob looks. Its presence requires that a cut be made in that position of the operating key(s)
combination wheel
A wheel type tumbler in a combination lock
compensate drivers
To select longer or shorter top pins, depending on the length of the rest of the pin stack, in order to achieve a uniform pin stack height
complementary keyway
Usually a disc tumbler keyway used in master keying. It accepts keys of different sections whose blades contact different bearing surfaces of the tumblers
composite blank
A blank designed to enter two or more simplex keyways
composite keyway
A keyway which has been enlarged to accept more than one key section, often key sections of more than one manufacturer
compound bitted key
A key with at least one compound cut
compound cut
A bitting which has another bitting dimension within its dimensions
compound lever
A lever tumbler that has two or more distinct sweeps contacted by two or more different keys
compressor wheel
See 'pressure bar wheel'
concealed key control
A specification that all keys and the non-visible portion of all lock cylinders be stamped with standard keying symbols
concealed screw rose
KIK or KIL trim that snaps into place to hide mounting screws
concealed shell cylinder
A specially constructed (usually mortise) cylinder. Only the plug face is visible when the lock trim is in place
concealed vertical rod exit device
A vertical rod exit device whose rods and header/threshold bolts are concealed within the door
concrete case
An enclosure for mounting a floor closer
configured pin
A bottom pin which is designed not to rotate along its long axis, often associated with off-centerline chambers
constant cut
Any bitting(s) which are identical in corresponding positions from one key to another in a keying system. They usually serve to group these keys together within a given level of keying, and/or link them with keys of other levels. See also "rotating constant"
construction breakout key
A key used by some manufacturers to render all construction master keys permanently inoperative
construction core
An interchangeable or removable core designed for use during the construction phase of a building. The cores are normally keyed alike and, upon completion of construction, they are to be replaced by the permanent system's cores
construction hole
A recess or pocket designed to receive ball bearings in lost-ball keying. The size and/or shape of the recess is such that a pin tumbler cannot enter it
construction master key
key normally used by construction personnel for a temporary period during building construction. It may be rendered permanently inoperative without disassembling the cylinder
construction master keyed
Of or pertaining to a cylinder which is or is to be operated temporarily by a construction master key
contact area
The gate area in a combination lock drive cam where the lever nose does not contact the drive cam
contact point(s)
The area on each side of the drive cam gate that the lever nose makes contact with. Most locks have a left contact point and a right contact point
contact switch
An electrical, magnetic or mechanical device that triggers a circuit(s) to open or closed depending on the application
contactless smart card
A card, conforming to the physical characteristics specified in ISO 7813 & 10536, which contains one or more integrated circuits and does not use contacts to obtain power and allow interface to external equipment
continuous duty
Designed to sustain application of power for extended periods
control additive
The numeric value of the thickness of the control sleeve expressed in increments relative to the A2, A3 or A4 format being used
control chamber
In an interchangeable or removable core, any chamber which has a control shear line, which is different from the operating shear line
control cut
Any bitting which operates the retaining device of an interchangeable or removable core
control dimension
In certain interchangeable or removable cores, the distance between the operating shear line and the control shear line, expressed either in units of the increment or as a measurement
control key
1. a key whose only purpose is to remove and/or install an interchangeable or removable core 2. a bypass key used to operate and/or reset some combination type locks 3. a key which allows disassembly of some removable cylinder locks
control lug
That part of an interchangeable or removable core-retaining device which locks the core into its housing
control number
A number used to calculate the size of the build-up pin when; (a) the sizes of bottom and master pins are known, or (b) the bitting depths of all operating keys are known
control shear line
The shear line which allows operation of the control lug of an interchangeable or removable core
control sleeve
The part of an interchangeable or removable core retaining device which surrounds the plug
controlled cross keying
A condition in which two or more different keys of the same level of keying and under the same higher level key(s) operate one cylinder by design; e.g., XAA1 operated by AA2 (but not XAA1 operated by AB1) Note: This condition could severely limit the security of the cylinder and the maximum expansion of the system when (1) more than a few of these different keys operate a cylinder, or (2) more than a few differently cross keyed cylinders per system are required
controller
A device that has decision making capability by way of authentication or lookup in a database. It serves a control function by having output relays or other interfaces with other devices which may include other controllers, electric strikes, alarms, or printers
Controller Area Network
A communications protocol used in vehicles which allows components to send data via a common electrical conductor
convertible dial
A dial that is designed to readily accept a key locking core at any time
coordinator
In conjunction with a pair of doors, a device designed to cause the inactive leaf to close first
core
1. a complete cylinder unit, often with a "figure eight" shape, see also, removable core and interchangeable core, 2. the key removable tumbler unit, that doesn't have a figure 8 shape
corner bracket
A door closer mounting plate attached to the upper corner of the jamb
covert entry
The use of entry or bypass techniques that can only be detected via disassembly and/or detailed inspection of lock components
CPL
Abb. the title "Certified Professional Locksmith" as awarded by ALOA
CPP
Abb. the title "Certified Protection Professional" as awarded by ASIS
CPS
Abb. the title "Certified Professional Safe Technician" as awarded by SAVTA
crane hinge
A three leaf hinge assembly with two of the leaves being mounted to the body and door and the third only to the other two leaves
CRL
Abb. the title "Certified Registered Locksmith" as awarded by ALOA
credential
Any authorizing instrument, other than a mechanical key, that can cause entry to be allowed
cremone bolt
A surface mounted, top and bottom locking, deadbolt mechanism operated by a central handle
cross-bore
A hole drilled into the face of a door where a bored or interconnected lockset is to be installed
cross keying
The deliberate process of combinating a cylinder (usually in a master key system) to two or more different keys which would not normally be expected to operate it together. See also "controlled cross keying" and "uncontrolled cross keying"
cruciform
Of or pertaining to a key section or keyway which usually resembles a plus sign (+) or the letter "X"
CSI
Abb. Construction Specifiers Institute
CTRL
Abb. control key
cuff
A sleeve mounted around a steering column to protect the column
cup escutcheon
Lock trim that creates a recess in a door face and does not protrude beyond the door face
cup handle
A fitting recessed into a door surface to provide a finger grip with which to move the door
cupboard latch
A latching mechanism typically surface mounted to the outside of cabinet doors or drawers
curb
A round safe lock cover that is rabbeted and has a wheel post as an integral part of its construction
curb post
A wheel post attached to a curb
curtain (British)
In a lever tumbler lock, a device that blocks access to the keyhole when the key is turned
curved lip strike
A strike so shaped as to effect smoother function of the latch while the door is closing
cut
To make cuts into a key blade, see also "key cut(s)"
cut angle
A measurement, usually expressed in degrees, for the angle between the two sides of a key cut, see also "degree of rotation"
cutaway
1. Of or pertaining to a device with material removed or a transparent cover to expose and demonstrate a mechanism or feature 2. n. any cutaway product
cut edge
The portion of the key blade which contains the cuts
cut key
A key which has been bitted or combinated
cut root
The bottom of a key cut
cut root shape
The shape of the bottom of a key cut. It may have a flat or radius of a specific dimension, or be a perfect "V"
cutter
The part of a key machine which makes the cuts into the key blank
cutter guard
A shield over a key machine cutter to protect the operator
CW
Abb. Clockwise, as used in combination dialing instructions
cylinder
A complete operating unit which usually consists of the plug shell, tumblers, springs, plug retainer, a cam/tailpiece or other actuating device, and all other necessary operating parts
cylinder blank
A dummy cylinder which has a solid face and no operating parts
cylinder clip
A spring steel device used to secure some types of cylinders
cylinder collar
A plate or ring installed under the head of a cylinder to improve appearance and/or security
cylinder guard
n. a protective cylinder mounting devicecylinder key
A broad generic term including virtually all keys for pin and disc tumbler locks
cylinder lock
Any lock that is operated by a cylinder key
cylindrical lockset
A bored lockset whose latch or bolt locking mechanism is contained in the portion installed through the cross-bore
day gate
A barrier used to restrict passage during normal business hours, normally used at a vault entrance
day key
1. the key for a day gate or day operation of a safe or vault lock 2. a cash register key which does not allow audit or reset functions 3. see 'change key'
daylock
1. a locking device, other than the primary lock, used to maintain the safe in a locked condition, 2. to insecurely close a safe or vault door without scrambling the combination, even though the door may not be opened by simply turning or pulling the handle
dead pin
An immovable pin in a tubular lock which functions as a ward
deadbolt
A bolt, which requires a deliberate action to extend, and which resists end pressure in the unlocking direction when fully extended
deadlock
A lock which incorporates a deadbolt
deadlocking
Pertaining to any feature which, when fully engaged, resists attempts to move the latch or bolt in the unlocking direction through direct pressure
deadlocking latch
A latchbolt with a deadlocking mechanism
declining step key
A key whose cuts are equal or deeper as you proceed from bow to tip
deco key finish
Any design embossed or imprinted on a key to give it an aesthetic appearance
decode
To determine a key combination by physical measurement of a key and/or cylinder parts
decoder gauge
A measuring device which helps determine the combination of a lock or cylinder without removing the tumblers
deflector cover
A removable shield designed to prevent pin point drilling on a safe
degree of rotation
A specification for the angle at which a cut is made into a key blade as referenced from the perpendicular; e.g., right (R or 2), left (L or 1) or center (= perpendicular) (C). This specification is typically used for some high security keys
delamination
The process on older laminated door safes of having to remove some layers of the lamination to allow access to the lock
delayed action closer
One which has a specific hold-open interval before it moves a door toward the latching position
delayed action timer
A secondary device which prevents movement of a bolt or boltworks until a set amount of time has elapsed. The device is normally set or activated as part of the unlocking process
delayed egress
An exit that will not open until a preset amount of time after actuation has elapsed
department master key
A master key which operates all or most master keyed locks of a given department
depth key set
A set of keys used to make a code original key on a key duplicating machine to a lock manufacturer's given set of key bitting specifications. Each key is cut with the correct spacing to one depth only in all bitting positions, with one key for each depth
derived series
A series of blind codes and bittings which are directly related to those of another bitting list
detector lever
A lever tumbler with an extra gate that, when elevated beyond the bolt fence, accepts a latching fence to prevent further movement of the tumbler
detector lock
A lock that incorporates a detector lever in its mechanism
detention lock
A lock designed for securing a cell or other area in a prison or jail
DHI
Abb. Door and Hardware Institute
dial
1. the typically rotatable member of a combination lock that may be used to differentiate locations on the combination wheels and cause operation of the lock, 2. the act of turning or rotating a dial
dial insert lock
A key operated cylinder used to lock the dial on a combination lock
dial ring
An escutcheon for a combination lock dial
dialer
1. a device, which automatically places a telephone call to a pre-set number when, activated 2. an electro-mechanical device which systematically tries different combinations on a dial operated combination lock
diamond back
Pertaining to a rim cabinet lock whose mounting flanges and case forms the general shape of a diamond
diamond pick
A tumbler manipulation device with a triangular protrusion at its tip
digital dial
A rotatable dial that causes a separate readable index, (typically digital), to change
digital dialer
A telephone communication device that dials a programmed telephone number, and transmits, via tones or pulses, one or more signals to a digital receiver
dimple
A conical or concave depression as used in bitting some types of keys, or for a pilot to guide a key into a keyway
dimple key
A key whose cuts are drilled or milled into its blade surfaces. The cuts normally do not change the blade silhouette
direct code
A designation assigned to a particular key which includes the actual combination of the key
direct drive
Of or pertaining to a combination lock with the drive cam mounted on the dial's spindle shaft
direction of rotation
The direction a combination lock dial is to be turned when the combination is worked. It usually is specified as clockwise (CW) or right (R), or counter clockwise (CCW) or left (L)
disc tumbler
1. a flat tumbler which must be drawn into the cylinder plug by the proper key so that none of its extremities extends into the shell 2. a flat, usually rectangular tumbler with a gate which must be aligned with a sidebar by the proper key
diskette lock
A usually key operated device which blocks access to the drive for a removable disk
display key
A special change key in a hotel master key system which will allow access to one designated guest room, even if the lock is in the shut out mode. It may also act as a shut out key for that room
divided plug keyway
A cylinder plug divided at the keyway into two parts. Either part may be replaced to result in a different keyway combination via different warding for the keyway
dog
1. to place an exit device in the holdback mode 2. in marine applications the latch for a hatch
dogging cylinder
A key operated cylinder used to dog an exit device
dogging device
In an exit device, a mechanism used to temporarily disable the latch from locking
dogging key
A key or tool used to dog an exit device
dogging screw
A screw used to dog an exit device
door bumper
An obstruction installed to prevent a door or lock from contacting another object
door closer
A device designed to regulate the closing of a door automatically by various means
door control
Any device which controls the opening, closing or position of a door
door holder
Any device designed to maintain a door in the open position
door lug
A non-movable projection on a safe door that helps keep the door in the locked position
door puller
A tool designed to open a safe deposit box by forcibly pulling the door and breaking the lock
door silencer
A bumper installed in the jamb stop to quiet the closing of a door
door swing
The direction and degree to which a door opens, as LH 90o, RH 180o, etc.
door viewer
A device with one or more lenses, mounted in a door at eye level, which allows a limited view through a door
double-acting closer
door closer designed to be used on a double-acting door
double- acting door
A door that may be pushed open from either side
double-acting hinge
A hinge which permits movement of a door in either direction from the closed position
double-acting lever tumbler
One that must be lifted a precise amount, neither too little nor too much to allow movement of a bolt
double bitted key
A key typically bitted on two opposite surfaces
double cut
1. two bittings for the same tumbler position 2. see "double bitted key"
double cylinder
Pertaining to a lock with two keyed cylinders
double cylinder deadlock
A deadbolt lock whose bolt may be operated by a key from either side
double-D
A shape consisting of two opposing arcs and two opposing flats adj. 2. Having such a shape
double-D punch
A tool used to make a double-D hole
double horn
Of or pertaining to a safe deposit type lock which requires two separate holes through the door
double locking
Of or pertaining to a lock with one or more bolts with different functions, typically a latch and a deadbolt
double pin
To place more than one master pin in a single pin chamber
double throw bolt
A deadbolt that has two distinct extended positions, both of which are deadlocked
drawback latch/lock
A latch/lock whose latch is disengaged by pushing or pulling an actuator toward the hinge side of the jamb
draw sheet
A page with a completed matrix of potential combinations used in Matrix Format Master Keying
drill point
The exact measurement of the location used to drill a locked up container to effect an opening
drive cam
The first wheel rotated by a dial or key that has an opening designed to allow the fence, lever, or tailbar to enter and facilitate in opening of the lock or safe
drive-in
Pertaining to a latch or bolt with a round face
drive pin
A protrusion on or through a drive cam or tumbler which drives or turns the next tumbler in a combination safe lock
driver spring
A spring placed on top of the pin stack to exert pressure on the pin tumblers
drop
A pivoting or swinging dust cover, see also "increment"
drop bolt
A lock with an interlocking bolt which moves vertically and may enter loops on the strike
drop in
The gate area of the drive cam where the lever nose drops into. Usually identified with a corresponding number on the dial
drop-in point
The location in a combination lock where the wheel gates are aligned with the fence
drop ring
A looped handle which can pivot, typically recessed and falls flush with the door face when not in use
dual custody
1. a function designed to require the presence of two persons with two different keys, combinations or codes to operate the same device 2. pertaining to such a function
dual locking cylinder
A style of lock cylinder whose key operates two independent locking mechanisms within the cylinder
dumbbell pin
A spool pin with serrations at the larger diameter ends
dumb card
An authorization credential that presents recorded data only
dumb reader
An access control interrogation device that can only relay data to a controller
dummy
Pertaining to any type of non-active device applied for aesthetic purposes
dummy cylinder
A non-functional facsimile of a rim or mortise cylinder used for appearance only, usually to conceal a cylinder hole
dummy trim
Non-active trim applied for aesthetic purposes
duplex
1. an early trade name used by Yale for: mortise locks with two pin tumbler cylinders on the same side of the lock, lever tumbler mortise locks with two keyways on the same side of the lock, to accomplish a master keying effect, 2. an early trade name used by Sargent for a master ring cylinder 3. a key machine which has two sets of carriages and cutters in effect creating two separate machines in one
duplicate
To copy, see also "duplicate key"
duplicate key
Any key reproduced from a pattern key
duress code
A special combination or operation sequence which conveys an alarm or other signal to a remote location while allowing access
dust box
An enclosure applied under a strike to enhance appearance and/or performance
dust cover
A device designed to prevent foreign matter from entering a mechanism through the keyway
dustproof cylinder
A cylinder designed to prevent foreign matter from entering either end of the keyway
dust proof strike
A typically floor mounted strike that has a spring loaded internal plunger designed to keep the receptacle free of dust and debris
Dutch door bolt
A bolt which secures the top section of a Dutch door to the bottom section
E label
Burglar resistive chest with door thickness at least 1 1/2" steel and wall thickness at least 1" steel
EAC
Abb. electronic access control
ECM
Abb. engine control module
edge-bore
A hole drilled into the edge of a door where a bored or interconnected lockset is to be installed
edge pull
A handle mounted on, or in, the edge of a sliding or pocket door for gripping to pull the door closed
educational occupancy
Those buildings or areas which are designated as places for education purposes according to life safety or building codes
effective plug diameter
The dimension obtained by adding the root depth of a key cut to the length of its corresponding bottom pin which establishes a perfect shear line. This will not necessarily be the same as the actual plug diameter
effective throw
The distance a deadlatch remains projected when the guard bolt has been engaged and end pressure is applied to the latch
EIA
Abb. Electronics Industry Association
ejector hole
A hole found on the bottom of certain interchangeable cores under each pin chamber. It provides a path for the ejector pin
ejector pin
A tool used to drive all the elements of a pin chamber out of certain interchangeable cores
elbow catch
An "L" shaped latching mechanism typically mounted to the inside of the inactive leaf of a pair of cabinet doors
electric strike
An electro-mechanical strike, which secures or releases the latch via applied current
electrified lockset
A lock which is controlled electrically
electronic access control
Access control that uses electricity
emergency code
In an electronic lock, a factory-set or user-set code or combination that will open the lock a predetermined number of times
emergency escape mechanism
An exit device for a vault
emergency key
The key which operates a privacy function lockset
emergency master key
A special master key which usually operates all guestroom locks in a hotel master key system at all times, even in the shut out mode. This key may also act as a shut out key
EMK
Abb. emergency master key
end cap
The cover typically used on the hinge side edge of many touch bar exit devices
end ward
A ward which prevents complete insertion and/or rotation of an incorrect key by forming an obstruction to the end of the key
end ward cut
Any cut made into a key to bypass an end ward
ENG
Abb. engineer's key
engineer's key
A selective master key which is used by maintenance personnel to operate many locks under different master keys in a system of three or more levels of keying
entrapment key
A key designed to be captured by a cylinder after insertion
entry/exit delay
An alarm or access control feature which allows a specific time lapse between the activation of a switch and the activation of a secondary component
ER label
Burglar resistive safe or chest bearing the following label. "Underwriters' Laboratories, Inc. Inspected tool resisting Safe TL-15 Burglary"
ERD
Abb. external relocking device
escapement
One of the components of a timelock which comprises the escape wheel, escapement lever, corresponding pivot (hole) jewels, bridge(s) and platform (base)
escutcheon
A surface mounted trim which enhances the appearance and/or security of a lock installation
espagnolette
A top and bottom locking system with hooks at either end which rotate to draw a door or window fully closed
exit alarm
An annunciator that signals the opening of an exit door
exit device
A door lock/latch mechanism which releases in the direction of exit travel via a bar or panel extending across the major width of the door
exit door
1. a door which has no provision for ingress, 2. a door which fills some or all the code requirement for safe egress of the occupant load from a building or portion of a building
exit only
Refers to hardware designed to secure an opening in such a way as to permit exit at all times but prevent entry at all times
exit width
1. a specification for the minimum door opening, (side to side), that requires application of an exit device, 2. an expression of an actual opening dimension
exit travel, direction of
The way occupants are expected to move to get out of a building or a portion of a building
expansion specification
A requirement for bittings to be planned beyond the immediate needs of a keying system
exploratory cut
A cut made during impressioning to stop a tumbler from marking
extended lip strike
A strike with a (usually curved) leading edge that protrudes to or beyond the edge of the jamb
extension flush bolt
A flush bolt that has a separate escutcheon and faceplate
extension link
A device which is used to extend the backset of a spring latch or dead latch
external relocking device
A device outside the lock case that prevents the safe door from being opened after attack, two types are typically used, active and passive
extractor key
A tool which normally removes a portion of a two-piece key or blocking device from a keyway
F rated Burglary Chest
A burglary resistive safe or chest bearing a TL-30 torch or tool resistance or a inspected explosive resisting safe with relocking device X-60 burglary rating
face
The finished component of a lock visible on the edge of a door
face cap
A finished cover, that may retain a dust cover or serve as a plug retainer, affixed to the face of some lock cylinders
face plate
The finished, removable plate which covers the front of some locks
factory alarm
One which is installed by the vehicle manufacturer
factory original key
The cut key furnished by the lock manufacturer for a lock or cylinder
fail-safe
A feature of a security device designed to release, for safety purposes, during a power loss
false acceptance rate
In a biometric access control device, the number of incorrect submissions that can be accepted as correct, typically expressed as per cent, e.g. less than 0.0001%
false gate
A gate in a part of the operating mechanism, which is not formed deeply enough to allow operation of the lock
false rejection rate
In a biometric access control device, the number of correct submissions that can be rejected as incorrect, typically expressed as per cent, e.g. less than 0.001%
FAR
Abb. false acceptance rate
FCC ID
Abb. Federal Communications Commission Identification
feather key
A type of flat key used for the original Yale pin tumbler mortise locks
fence
1. a projection on a lock bolt which prevents movement of the bolt unless it can enter gates of properly aligned tumblers, 2. any locking element other than a sidebar or shackle designed to enter a tumbler's gate, 3. a projection on the lever in a combination lock that prevents the lever from engaging the drive cam until the proper combination is entered, see also "sidebar"
file cabinet lock
1. any lock used on a file cabinet 2. a plunger lock cylinder for a gang lock normally used in a file cabinet
fill program
A computer based code reference which determines all combinations in a code series that match a given partial combination
filler plate
A usually flat piece of material used to; cover a hole or opening, provide a foundation for mounting additional hardware, or adjust the position of hardware as mounted
fine ward
A ward made of sheet metal, typically installed as a bridge ward
finger side
1. the side of a flat single sided cylinder key on the right when the cuts are on the top edge, 2. the side of a tubular key on the right when the positioning nib is on the top, 3. the side of a cruciform key on the right when the uncut rib is on the bottom
finish
A material, coloring and/or texturing specification
fire alarm
A system designed to detect and report conditions, which may indicate presence of a fire
fire door
A door constructed to provide a specific degree of fire protection
fire door assembly
Any combination of a fire door, frame, hardware and other accessories, that together provides a specific degree of fire protection to the opening
fire exit hardware
Exit devices, which may legally be installed, on fire doors. Distinguished from other exit devices because it: 1. is labeled for both fire and panic and; 2. has no means of locking the latch in a retracted position
fire separation
construction designed to limit the spread of fire in a structure
fireman’s key
A key used to override normal operation of elevators, bringing them to the ground floor
first generation duplicate
A key which was duplicated using a factory original key or a code original key as a pattern
first key
Any key produced without the use of a pattern key
five column progression
A process wherein key bittings are obtained by using the cut possibilities in five columns of the key bitting array
five pin master key
A master key for all combinations obtained by progressing five bitting positions
fixed fly
In a combination lock, a fly that does not move relative to the wheel it is on
fixed pin hand change wheel
A combination wheel that uses pressed or threaded pins as a fixed fly
fixed rise (chamber)
A plug and shell pin chamber design associated with fixed rise pins
fixed rise (pin)
Of or pertaining to a pin tumbler which is designed to operate properly only when its rotation capabilities are limited or precluded
fixed tumbler
A ward located within the tumbler pack
flat goods
Ancillary architectural hardware such as push plates, mop plates, stretcher plates, kick plates, etc.
flat steel key
Aflat type key made of steel
flat type key
A key which is completely flat on both sides, usually used for warded or lever tumbler locks
flexible head mortise cylinder
An adjustable mortise cylinder which can be extended against spring pressure to a slightly longer length
floor closer
A door closer installed below the door at the floor surface, generally also acting as a bottom pivot for the door
floor master key
A master key which operates all or most master keyed locks on a particular floor of a building
floor safe
A security container designed for mounting below floor level with the top surface flush with the finished floor
flush bolt
A non-keyed deadbolt, with a one piece escutcheon/faceplate, typically mounted flush to door surfaces
flush cup pull
A flush pull with a circular cross-section
flush pull
A recess in a door or drawer which serves as a handle or grip
flush ring
A ring, recessed into a door, which swings out to serve as a handle
fluted key
A key for a lever lock with a section that is wider in the middle than on the edges
fly
The part of a combination wheel pack or a drive cam that makes contact with a similar part on an adjacent wheel in the wheel pack and causes it to turn
fly stop
The part of a combination lock wheel that restricts the motion of a movable fly
folding key
A key with multiple sections that pivot to make it more compact
foot
The cam portion of the trunnion assembly in some lever tumbler locks
foot bolt
A bolt mechanism typically mounted at the bottom of a door, and designed to be easily operated by ones foot
forbidden zone
On a combination lock dial, a range of marks within which the last item of the combination must not be set to provide for proper lock operation
forced entry
Entry or bypass techniques which leave obvious damage to the lock or enclosure
fork lock
A motorcycle or bicycle lock which prevents the front fork from rotating
four column progression
A process wherein key bittings are obtained by using the cut possibilities in four columns of the key bitting array
four pin master key
A master key for all combinations obtained by progressing four bitting positions
Fox police lock
A double acting two point deadlock with a bolt for each side of a door or a three point version with an additional vertical brace to the floor
frangible shackle
A padlock shackle designed to be broken easily
frangible shackle padlock
A padlock equipped with an easily broken shackle
frangible tumbler
A tumbler whose reference size may be permanently altered, or established, mechanically without removal from the cylinder
French doors
A set of double doors composed of many small glass panes and narrow stiles
friction catch
A door or cabinet latching device which contains no actuator and is released by applying a measure of force in the opening direction
friction fence
A combination lock fence that is usually mounted loosely to a rotatable member that biases the fence to test the cam and wheels for alignment at drop in
friction hinge
A device with torque resistance between two parts on a common axis
frictioned plug
A type of clutch system permitting both sides of a double profile cylinder to operate the lock regardless of whether the opposite plug is turned
front
The portion of a lock which provides the means of mounting the locking device to the edge of the door
front drive
Of or pertaining to a combination lock with the drive cam located between the dial and the wheel pack
front reading (dial)
A safe dial that has graduations on the face
FRR
Abb. false rejection rate
full lip strike
A strike plate for a latch with the lip extending the full height of the strike
full mortise
Pertaining to a method of installation in which only the faceplate and trim is exposed. The lock case is installed in a pocket in the door or drawer. To make a rectangular pocket in a door or drawer that is only open on the edge of the door or drawer
full mortise hinge
A type of hinge designed for mortising into the edge of the door and into the rabbet of a door frame
function
A set of operating features for a particular type of lock or exit device which make it suitable for a specific application. The function is designated by a classification name or standards reference number. See ANSI or BHMA for a \specific listing
fusible link
A relock trigger activated by heat
fusible link arm
A door closer arm which includes a mechanism for holding a door open. This mechanism has an element which, when subjected to certain temperatures, melts and allows the door to close
galling
A transfer of material from one surface to another as a result of friction
gang lock
A locking mechanism with multiple bolts which locks different openings simultaneously by a single action
garage door lock
A rim lock mechanism designed for use on an overhead door, which mechanism has a spring loaded bolt which automatically locks the door's bolt mechanism
gate
A notch cut into the edge of a tumbler to accept a fence or sidebar
gate cover
A component to prevent the fence from entering the combination wheel gate while changing a combination on a zero change lock
geographical exclusivity
A feature, offered by some manufacturers, of distributing keyways and/or combinations for locks to ensure uniqueness in a geographic location
GGGMK
Abb. great great grand master key
GGGMK'D
Abb. great great grand master keyed
GGM
Abb. great grand master key
GGMK
Abb. great grand master key
GGMK'D
Abb. great grand master keyed
glass relocker
A device employing a frangible plate intended to permanently incapacitate a security container's normal opening mechanism if activated by physical attack on the container
GM
Abb. grand master key
GMK
Abb. grand master key
GMK section
Abb. grand master key section
GMK'D
Abb. grand master keyed
graduated drivers
A set of top pins of different lengths. Usage is based on the height of the rest of the pin stack, in order to achieve a uniform pin stack height. See also "compensate drivers"
grand master key
The key which operates two or more separate groups of locks, which are each operated by a different master key
grand master key system
A master key system which has exactly three levels of keying
grand master keyed
Of or pertaining to a lock or cylinder which is or is to be keyed into a grand master key system
graphite gun
A usually flexible container designed to dispense a powdered lubricant
gravity pivot hinge
A hinge with complimentary sloped or V shaped knuckles on each leaf that cause gravity to turn the door back to the closed position
great grand master key
The key which operates two or more separate groups of locks which are each operated by a different grand master key
great grand master key system
A master key system which has exactly four levels of keying
great grand master keyed
Of or pertaining to a lock or cylinder which is or is to be keyed into a great grand master key system
great great grand master key
The key which operates two or more separate groups of locks which are each operated by different great grand master keys
great great grand master key system
A master key system which has five or more levels of keying
great great grand master keyed
Of or pertaining to a lock or cylinder which is or is to be keyed into a great great grand master key system
grip
The knob, lever, thumbpiece, push-pull operator, etc. of any working trim
group 1
A UL rating given to a mechanical combination lock able to withstand 20 man-hours of expert manipulation as well as other specifications listed in UL 768
group 1R
A UL rating given to a mechanical combination lock equal to a group 1 lock which has the added feature of being X-Ray resistant, and which meets other requirements listed in UL publication 768
group 2
A UL rating given to a mechanical combination lock able to withstand reasonable expert manipulation as well as other specifications listed in UL 768
group 2M
A UL rating given to a mechanical combination lock able to withstand 2 man-hours of expert manipulation as well as other specifications listed in UL 768
GSA
Abb. General Services Administration (US Government)
GSA Class 1
A GSA approved container meeting Federal Specification AA-F-357(canceled) with entry protection consisting of 10 Man-Minutes forced entry, 30 Man-Minutes surreptitious entry and 1 hour fire rating
GSA Class 2
A GSA approved container meeting Federal Specification AA-F-357(canceled) with entry protection consisting of 5 Man-Minutes forced entry, 20 Man-Minutes surreptitious entry and 1 hour fire rating
GSA Class 3
A GSA approved uninsulated container meeting Federal Specification AA-F-358 with entry protection consisting of 20 Man-Minutes surreptitious entry
GSA Class 4
A GSA approved uninsulated container meeting Federal Specification AA-F-358 with entry protection consisting of 5 Man-Minutes forced entry, 20 Man-Minutes surreptitious entry
GSA Class 5
A GSA approved uninsulated container meeting Federal Specification AA-F-358 with entry protection consisting of 10 Man-Minutes forced entry, 20 Man-Hours surreptitious entry and 30 Man-Minutes Covert entry
GSA Class 6
A GSA approved uninsulated container meeting Federal Specification AA-F-358 with entry protection consisting of 20 Man-Hours surreptitious entry and 30 Man-Minutes covert entry
GSA Class 7
A GSA approved uninsulated container meeting Federal Specification AA-F-2815 (canceled) with entry protection consisting of 20 Man-Hours surreptitious entry and 15 Man-Minutes covert entry
GSA container
Any container approved by the General Services Administration for storage of classified material
GSA weapons container
A GSA vault or map and plan container used to store weapons and requiring a minimum protection of a Group 1 lock
guard bolt
A spring loaded bolt which, when activated, will deadlock a latch bolt
guard filler
A spacer used in place of a lever in the guard lever pack of a safe deposit lock
guard key
A key which must be used in conjunction with a renter's key to unlock a safe deposit lock. It is usually the same for every lock within an installation
guard lever
Any lever tumbler, in a safe deposit lock, intended to be operated by the guard key
guard post
1. the circular member in a safe deposit lock upon which the guard levers are mounted , 2. (sic) the trunnion for the guard key in a safe deposit lock
guard tumbler
Any tumbler installed in a safe deposit lock for the guard key to activate
guest key
A key in a hotel master key system which is normally used to unlock only the one guest room for which it was intended, but will not operate the lock in the shut out mode
guide
1. that part of a key machine which follows the cuts of a pattern key or template during duplication 2. that part of a flat key lever lock which connects the nose to the foot and supports the key blade
half moon cut
A semi-circular cut in the bolt throw bit of a key, with the cut axis running parallel to the key shaft. Found typically on a key for a high security lever safe lock
half mortise
1. pertaining to an installation prep that typically leaves the bolt face plate and a perpendicular surface of the lock visible, with visible surfaces being flush mounted, 2. to make a cavity in a door or drawer that is open on the edge and on one side of the door or drawer, 3. pertaining to a locking device designed to fit in a half mortise prep
half-mortise hinge
A hinge which has one leaf mortised into the door and the second leaf applied to the surface of the frame
half-surface hinge
A hinge which has one leaf mounted onto a face of the door and the second leaf mortised into the frame
hand change
Pertaining to a combination lock in which the wheels must be removed in order to change the combination
handed
Pertaining to hardware which is manufactured only for application on doors with a specific orientation
handleset
A complete lock or latch assembly which incorporates a pitcher handle
handicapped code
Any building code designed to ease access for handicapped persons
hang (rake & hang)
To cause a top or master pin to rest on the plug when picking
hardened core (pin)
A bottom or top pin which is bimetallic, the central portion of which being hardened metal intended to resist drill attack
hardplate
A tempered barrier placed between the lock and the outside of a safe to inhibit drilling
hard wire system
A system which uses metallic conductors to connect the various sensors to the central processor
hardware key
A computer hardware component which protects copyrights by preventing software from running on any computer where the key is not installed. The key is typically accessed via one of the ports
hardware schedule
A listing of the door hardware used on a particular job it includes the types of hardware, manufacturers, locations, finishes, and sizes. It should include a keying schedule specifying how each locking device is to be keyed
hasp
A hinged metal strap designed to be passed over a staple and secured in place
header
The horizontal, top, member of a door jamb
heel & toe locking
Describes a padlock which has locking dogs at both the heel and toe of the shackle
heel (of a padlock shackle)
The part of a padlock shackle which is retained in the case when in the unlocked position
height adjustment screw
A screw contained within the hinge block of a safe that raises or lowers the door to clear the frame
helmet lock
Auxiliary lock on motorcycles used to secure a helmet
HGM
Abb. horizontal group master key
HiCo
Abb. high coercivity
high coercivity
A high energy form of magnetic encoding measuring in the range of 2400 to 4000 Oe which is resistant to accidental erasure
high security cylinder
A cylinder which offers a greater degree of resistance to drilling or other forms of forcible entry and one or more of the following: picking, impressioning, or key duplication
high security key
A lock operating device which offers additional defense against its duplication, and/or provides integral features precluding bypass/neutralization of a lock
hinge security stud
A protrusion on one leaf of a hinge which interlocks with the other when the door is closed
hinge stile
The vertical edge of a door where hinges are installed
hinged shackle
A shackle whose heel is permanently mounted to the padlock case in a manner which allows the shackle to pivot to open
HKP
Abb. housekeeper's key
Hobbs shackle
A hinged shackle with a notch for the bolt in its movable end
hold open
1. a function of self latching hardware which allows a lock to be set in a non-latching mode 2. A function of a door closer, or separate hardware device, which allows the door to be retained in an open position
hold open arm
A door closer arm with the capability of maintaining the door in the open position
hold open cylinder
A cylinder provided with a special cam which will hold a latch bolt in the retracted position when so set by the key
holdback
A function of some self latching locks which allows selective retention of the bolt to prevent latching when the door is closed
holding fixture
A device which holds cylinder plugs, cylinders, housings, and/or cores to facilitate the installation of tumblers, springs and/or spring covers
hole change (wheel)
A perforated tumbler that may have its combination set by placement of a fly relative to, or in, one of the perforations
hollow core door
A non-metal door with structural reinforcement creating air pockets between the two faces
hollow driver
A top pin hollowed out on one end to receive the spring, typically used in cylinders with extremely limited clearance in the pin chambers
hollow metal door
Typically a door made of sheet metal on all surfaces and lightly reinforced to make it rigid
hook
A vertical surface at the top of a cut angle that prevents smooth insertion or withdrawal of a key
hook bolt
A lock bolt shaped in the general outline of a hook. Normally used on sliding doors or where spreading of the frame and door is a possible attack
hook pick
A pick with a tip that curves upward by 45o or more toward perpendicular to the blade
hook ward
A ward that has an offset requiring an 'L' shaped cut in the key
horizontal exit
An exit to the outside or an area of refuge on the same or nearly the same level
horizontal group master key
The two pin master key for all combinations listed in all blocks in a line across the page in the standard progression format
horizontal locking
The locking mechanism associated with vehicle doors with horizontal linkage
horn
In a non-cylinder lock, the housing which surrounds the nose and extends through the door or drawer
horn plate
The cover of a lever tumbler lock case to which the horn is attached
hospital hinge
A hinge with a large chamfer at each end of the knuckle
hotel cylinder
A cylinder which can function to prevent the operation of all keys except emergency, display and some shut out keys. It may also contain an indicator
housekeeper's key
A selective master key in a hotel master key system which may operate all guest and linen rooms and other housekeeping areas
housing
That part of a locking device which is designed to hold a core
HP
Abb. hardplate
hub
1. a lock component, which redirects rotational motion from a spindle or shaft to linear movement of a latch or bolt, 2. (key change), the part of a combination wheel that the change key engages to permit the combination to be changed
hybrid key
A key that can operate locks using two or more different technologies in one device, e.g. mechanical/electronic, mechanical/magnetic, etc.
hybrid locking system
A locking system which derives its security from two or more different technologies operated by the same key in one device, e.g. mechanical/electronic, mechanical/magnetic, etc.
IC
Abb. interchangeable core
ICBO
Abb. International Conference of Building Officials
ignition key release
A button or other actuator which must be pushed before a vehicle's ignition key may be turned to the withdrawal position
ignition lock
The lock assembly associated with a vehicle's engine on-off switch and starter
ignition puller
A tool for removing an ignition cylinder by pulling outward on it
ILA
Abb. Institutional Locksmiths Association
ILCP
Abb. "Institutional Locksmith Certification Program"; a locksmith certification program administered by ILA
impression
1. the mark made by a tumbler on its key cut 2. v. to fit a key by the impression technique
impression technique
A means of fitting a key directly to a locked cylinder by manipulating a blank in the keyway and cutting the blank where the tumblers have made marks
impressioning tool
1. a tool designed to hold a key blank while making a key by the impression method, 2. a tool which fits into a keyway and holds a material that accepts impression marks easily
inactive case
The exit device case mounted on the stile opposite the lock stile
inactive door
The door of a pair, which is secondary in usage and is normally locked by surface or flush bolts
incidental master key
A key cut to an unplanned shear line created when the cylinder is combinated to the top master key and a change key
increment
A usually uniform increase or decrease in the successive depths of a key cut which must be matched by a corresponding change in the tumblers
independent custody
1. a function of a locking mechanism that allows separate access by either of two different people, each with a different type method of opening and closing the lock, 2. pertaining to such a function
index (of a combination lock dial)
The mark outside the dial ring of a combination lock used as a reference point
indicator
A device which provides visual evidence that a deadbolt is extended or that a lock is in the shut out mode
individual key
An operating key for a lock or cylinder which is not part of a keying system, see also "change key" #1
inner ring
That part of a mesh change or key change combination wheel that makes direct contact with the wheel post
inner spindle assembly
A component in some manipulation-resistant safe locks that connects the knob with the drive cam to open the gate in the drive cam
integral lockset
A lockset that combines two or more different mounting or operational methods, typically key-in-knob and mortise
interchange
An undesirable condition whereby a key unintentionally operates a cylinder or lock
interchangeable core
A key removable core which can be used in all or most of the core manufacturer's product line. No tools (other than the control key) are required for removal of the core
interconnected lockset
A lockset whose trim provides a means of simultaneous retraction of two or more bolts which may also be operated independently
interlocking bolt
A bolt which interlocks with its strike when fully engaged
interlocking pin tumbler
A type of pin tumbler which is designed to be linked together with all other tumblers in its chamber when the cylinder plug is in the locked position
intermittent duty
Of or pertaining to an electric strike or lock not designed to be energized for extended periods of time
internal relocking device
Adevice inside a safe lock case that prevents the lock bolt from being retracted after attack
IP
Abb. internet protocol
IR
Abb. Infrared
IRD
Abb. internal relocking device
jackscrew
A threaded rod used for centering and balancing a vault door & frame in position during installation
jamb
The vertical components of a door frame
jiggered finish
A surface adorned with overlapping concentric circles
jimmy proof
Pertaining to a lock having a bolt which interlocks with its strike
JIS
Abb. Japanese Industrial Standard
jumbo cylinder
A rim or mortise cylinder of 1-1/2" diameter
k
Symbol for "keys" used after a numerical designation of the quantity of the keys requested to be supplied with the cylinders; e.g., lk, 2k, 3k, etc. it is usually found in hardware/keying schedules
KA
Abb. keyed alike
KA1, KA2, etc.
Symbol which indicates that all cylinders so designated are or are to be operated by the same key(s). The numerical designation indicates the keyed alike group or set
KA/2, KA/3, etc.
Symbol used to indicate the quantity of locks or cylinders in keyed alike groups. These groups are usually formed from a larger quantity; e.g., 30 cylinders KA/2
Kalamein door
A metal clad door that has a wood filler
KBA
Abb. key bitting array
KBA order
The arrangement of potential key cuts within each chamber position of the key bitting array, e.g. odometer, top-down or randomized
KD
Abb. keyed different
keeper
The movable portion of an electric strike which captures the bolt, see also "strike"
key
A properly combinated device which is, or most closely resembles, the device specifically intended by the lock manufacturer to operate the corresponding lock
key bitting array
A matrix (graphic) display of all possible bittings for change keys and master keys as related to the top master key
key bitting punch
A manually operated device which stamps or punches the cuts into the key blade, rather than grinding or milling them
key bitting specifications
The technical data required to bit a given (family of) key blank(s) to the lock manufacturer's dimensions
key blank
Any material manufactured to the proper size and configuration which allows entry into the keyway of a specific locking device and may then be bitted to become an operating key for the device
key cabinet
A cabinet with hooks, velcro, or other means designed to store keys systematically
key caliper
An outside caliper specifically made with an anvil of size and shape to measure the root depth of bittings
key casting kit
A collection of mold, filler and equipment which permits duplication of a key through the production of a soft metal temporary likeness
key change
Referring to a lock in which the combination can be changed through the use of a special key or tool without disassembling the lock
key change wheel
A safe lock component that may have the orientation of its gate altered via a special key and process
key changeable
Of or pertaining to a lock or cylinder which can be recombinated without disassembly, by the use of a key. The use of a tool may also be required
key check
A small identification tag on which characters are imprinted, typically attached to a key by a ring
key clamp
1. a part on some types of clippers that secures the key, 2. see key vise
key coding machine
A key machine designed for the production of code keys. It may or may not also serve as a duplicating machine
key control
1. any method or procedure which limits unauthorized acquisition of a key and/or controls distribution of authorized keys 2. a systematic organization of keys and key records
key cut(s)
The portion of the key blade which remains after being cut and which aligns the tumbler(s)
key cut profile
The shape of a key cut, including the cut angle and the out root shape
key duplicating machine
A key machine which is designed to make copies from a pattern key
key extractor
A tool designed for use to remove a broken or stuck key from a lock
key gauge
A usually flat device with a cutaway portion indexed with a given set of depth or spacing specifications. It is used to help determine the combination of a key
key holder
A person to whom a key has been issued
key-in-knob cylinder
A cylinder used in a key-in-knob lockset
key-in-knob lockset
Any lockset with a key operated cylinder in one or more knobs
key-in-lever lockset
Any lockset with a key operated cylinder in one or more lever handles
key interchange
An undesirable condition, usually in a master key system, whereby a key unintentionally operates a cylinder or lock
key lock
Pertaining to a device operated by a mechanical key, as opposed to combination, electonics, etc.
key locking dial
A combination lock dial which can be disabled by a keyed lock cylinder
key locking dial ring
A dial ring fitted with a keyed lock that can disable the dial
key machine
Any machine designed to cut keys, See also "key coding machine" and "key duplicating machine."
key manipulation
Manipulation of an incorrect key in order to operate a lock or cylinder
key micrometer
An outside micrometer specifically made with an anvil of size and shape to measure the root depth of bittings
key milling
The grooves machined into the length of the key blade to allow its entry into the keyway
key override
1. a provision allowing interruption or circumvention of normal operation of a combination lock or electrical device 2. of or pertaining to such a provision, as in "key override cylinder"
key override cylinder
A lock cylinder installed in a device to provide a key override function
key pull(s)
A lock specification which indicates by quantity and orientation the position(s) in which a key may be withdrawn
key pull position
Any position, of the cylinder plug at which the key can be removed
key records
Records which typically include some or all of the following: bitting list, key bitting array, key system schematic, end user, number of keys/cylinders issued, names of persons to whom keys were issued, hardware/keying schedule
Key Records Department
The department which is responsible for generating and issuing all lock and key combinations and maintaining records of them
key rest
A non-movable part of a key machine vise that is used to position and align the bottom of the blade
key retaining
1. of or pertaining to a lock which must be locked before its key can be removed. 2. of or pertaining to a cylinder or lock which may prevent removal of a key without the use of an additional key and/or tool
key section
The exact cross sectional configuration of a key blade as viewed from the bow toward the tip
key section identifier
Any tool, device or software used to identify a particular key section
key switch
A switch operated by a keyed lock mechanism, which may be an integral part of the switch assembly
key symbol
A designation used for a key combination in the standard key coding system, e.g., A, AA, AA1, etc.
key system schematic
A drawing with blocks utilizing keying symbols, usually illustrating the hierarchy of all keys within a master key system. It indicates the structure and total expansion of the system
key trap core/cylinder
A special core or cylinder designed to capture any key to which it is combinated, once that key is inserted and turned slightly
key vise
The part of a key machine that holds a key
key wound
Of or pertaining to a time lock, one that is set and or powered by a removable element resembling a key
keyed
1. combinated 2. having provision for operation by key
keyed alike
Of or pertaining to two or more looks or cylinders which have or are to have the same combination. They may or may not be part of a keying system
keyed different
Of or pertaining to a group of locks or cylinders, each of which is or is to be combinated differently from the others. They may or may not be part of a keying system
keyed random
Of or pertaining to a cylinder or group of cylinders selected from a limited inventory of different key changes. Duplicate bittings may occur
keyhole
The opening through which a non-cylinder key must pass to enter a lock
keyhole lock
A portable lock that may be locked into a bit key aperture to block access
keyhole plate
An escutcheon for a keyhole
keying
Any specification for how a cylinder or group of cylinders are or are to be combinated in order to control access
keying conference
A meeting of the and user and the keying system supplier at which the keying and levels of keying, including future expansion, are determined and specified
keying kit
A compartmented container which holds an assortment of tumblers, springs and/or other parts
keying schedule
A detailed specification of the keying system listing how all cylinders are to be keyed and the quantities, markings, and shipping instructions of all keys and/or cylinders to be provided
keying symbol
A designation used for a lock or cylinder combination in the standard key coding system; e.g., AA1, XAA1, XlX, etc.
keyway
1. the opening in a lock or cylinder which is shaped to accept key bit or blade of a proper configuration 2. the exact cross sectional configuration of a keyway as viewed from the front. It is not necessarily the same as the key section
keyway post
1. see "guide" # 2" 2. the projecting pin of a lock or cylinder which enters the hollow end of a key
keyway unit
The plug of certain binary type disc tumbler key-in-knob locks
keyway ward
A ward which prevents entry of an incorrect key into a cylinder or lock
kick plate
A protective plate mounted on the bottom of a door to prevent damage to minimize damage to the door
KIK
Abb. Key-in-Knob
KIL
Abb. Key-in-Lever
knob screw
A screw used to fasten a slip-on knob to a mortise lock spindle, or a set screw which maintains the position of a knob on a threaded mortise lock spindle
knob washer
A spacer used to shim the clearance between a slip-on mortise lock knob and the trim
knock-out tag
The portion of a key bow where a code number may be stamped and which is designed to be removed from the bow prior to normal usage
knuckle
The part of a hinge that is formed to accept a hinge pin and act as a pivot surface for another knuckle
KR
Abb. 1. keyed random 2. key retaining
KWY
Abb. keyway
L-handle
An L-shaped handle assembly which may be lockable
L-handle lock
A cabinet lock with an L-shaped handle
labeled door
A door which has a fire protection certification by one of the recognized underwriting agencies
labeled exit
A labeled door equipped with labeled hardware that can be used for building egress
laminated padlock
A padlock whose case is constructed of separate plates usually riveted together
LAN-alarm web camera
A self-standing surveillance camera having alarm compatible for IR devices, switches and onboard website, Internet email sending capability
large format interchangeable core
An interchangeable core which is too large to fit into a small format interchangeable core housing
laser cut
1. a way of cutting a key so that the roots of adjacent cuts are connected by a straight-line cut; 2. a way of cutting a key so that the root of a shallow cut is widened until it intersects the included angle of an adjacent deeper cut
latch
1. a mechanical or magnetic door fastener which can automatically keep a door, gate, etc., closed, 2. engagement of a latch when a door, gate, etc. is pushed or pulled closed
latch bolt
A spring actuated bolt, normally with one or more beveled surfaces, which, when aligned with the strike, engages it automatically
latch guard
A plate or combination of interlocking pieces designed to block access to the edge of a latch when the door is shut
latch tube
The encasement portion of some types of lockset that contains the latch and may also contain its operating mechanism
latching speed (of a door closer)
The final speed of a door just prior to closing
latching threshold
One which has a shape designed to act as a strike
latchset
A non-locking device which contains only a latch bolt, a means of operating said latch and all required trim
layout tray
A compartmented container used to organize cylinder parts during keying or servicing
lazy cam/tailpiece
A cam or tailpiece designed to remain stationary while the cylinder plug is partially rotated and/or vice- versa
leading face
The door face closest to the strike side of the jamb when the door is open
leaf
1. one half or section of a hinge 2. One door in a set of double doors 3. One section of a multiple section door
left hand (man door)
Pertaining to an inward swinging door with hinges on the left side, using the outside of the door as reference
left hand reverse bevel (door)
Pertaining to a left handed door which swings outward
left track
The farthest left bitting surface of a sidewinder key, as the wider surface of the blade is viewed with the bow of the key nearest the observer
leg irons
A pair of ringlike fetters, connected by a short chain or straight member, designed to be locked about the ankle
levels of keying
The divisions of a master key system into hierarchies of access, as shown in the following tables. Note: the standard key coding system has been expanded to include key symbols for systems of more than four levels of keying: TWO LEVEL SYSTEM, THREE LEVEL SYSTEM, LEVEL OF KEYING, Level II Level I KEY NAME master key change key ABB. MK CK KEY SYMBOL AA 1AA, 2AA, etc. LEVEL OF KEYING Level III Level II Level I KEY NAME grand master key master key change key ABB. GMK MK CK KEY SYMBOL A AA, AB, etc. AA1, AA2, etc FOUR LEVEL SYSTEM FIVE LEVEL SYSTEM SIX LEVEL SYSTEM LEVEL OF KEYING Level IV Level III Level II Level I KEY NAME great grand master key grand master key master key change key ABB. GGMK GMK MK CK KEY SYMBOL GGMK A, B, etc. AA, AB, etc. AA1, AA2, etc. LEVEL OF KEYING Level V Level IV Level III Level II Level I KEY NAME great great grand master key great grand master key grand master key master key change key ABB. GGGMK GGMK GMK MK CK KEY SYMBOL GGGMK A, B, etc. AA, AB, etc. AAA, AAB, etc. AAA1, AAA2, etc. LEVEL OF KEYING Level VI Level V Level IV Level III Level II Level I KEY NAME great great grand master key great grand master key grand master key master key sub-master key change key ABB. GGGMK GGMK GMK MK SMK CK KEY SYMBOL GGGMK A, B, etc. AA, AB, etc. AAA, AAB, etc. AAAA, AAAB, etc. AAAA1, AAAA2, etc.
lever (combination lock)
Part of a combination lock that engages the drive cam, when the proper combination is supplied, and is directly attached to the locking bolt
lever handle
A turn device in the general shape of an "L" used on certain locks and latches, as an alternate to a knob for ease of use
lever nose
The hooked portion of a lever that engages the drive cam in a combination lock
lever pack
A set of lever tumblers
lever rig
Any device which utilizes a fulcrum with a long bar or pole as a means to apply pressure while drilling
lever spring
Applies directional force to the lever
lever tumbler
A flat, spring-loaded tumbler which usually pivots on a post. It contains a gate which must be aligned with a fence to allow movement of the bolt
LFIC
Abb. Large Format Interchangeable Core
LH
Abb. left hand
LHR
Abb. left hand reverse bevel
LHVD
bb. left hand vertical down
LHVU
Abb. left hand vertical up
lift arc
The distance a lever tumbler may be raised by a key from its at-rest position
liftback
A non-vertical door on the rear of a vehicle that allows access to the passenger compartment
linkage
1. any of various parts in a lock that help transfer motion to the bolt of a lock from a cylinder, turnpiece or other actuator not mounted to or touching the bolt/lock case, 2. part of the interconnected boltworks of an automotive lock
lip (of a strike)
The extended (usually curved) leading edge of a strike
lite
A hole in a door or wall to admit light, usually with glass or another transparent or translucent pane
loading tool
A tool which aids installation of cylinder components into the cylinder shell
LOBC
Abb. 1. locked on by combination, 2. (sic) locked on back cover
LOBC index
The index to which a combination is dialed in order to remove the lock's cover
local alarm
An alarm that is annunciated in the immediate vicinity of the activating device
locating boss
An integral part of the case used to align a safe lock in mounting (used on locks with a spindle tube)
lock
Any device which prevents access or use by requiring special knowledge or equipment
lock bumping
A picking technique that utilizes a configured key forcefully impacted into the keyway
lock-in
Of or pertaining to a combination lock that is inoperable because the last number of a combination is set in the forbidden zone
lock service package
A kit offered by the manufacturer or distributor of a product, which contains what he deems required to properly service the product<
lock stile
The vertical edge of a door designed for lock or latch installation
lock window
An opening in the case of a lever tumbler lock for viewing the fence entering the gates of the levers
lockdown bar
An assembly which permits a laptop computer to be used, opened, closed, but not removed from a premises, often secured by a padlock
locked closed
Of or pertaining to a condition wherein the bolt(s) are engaged and the lock(s) are restricting access
locked on by combination
A combination lock cover that can only be removed in conjunction with dialing the combination or while the lock bolt is in motion
locked open
Of or pertaining to a condition wherein the bolt(s) are engaged and lock(s) are not restricting access
locker lock
1. any of various types of locks designed for a specific mounting preparation commonly used on lockers as well as other applications, 2. any of various locks used to lock lockers
locking lug
A fixed component of a safe which locks the safe door in place in the locked position. See appendix
locking lug nut
A lug nut which requires the use of a key or special wrench
lockout
Any situation in which the normal operation of a lock or cylinder is prevented
lockout key
A key made in two pieces. One piece is trapped in the keyway by the tumblers when inserted and blocks entry of any regular key. The second piece is used to remove the first piece
lockset
A locking device, complete with trim, mounting hardware and strike
locksmith
A person with the knowledge and ability to select, install, service and bypass all the components of an electrical or mechanical lock
LoCo
Abb. low coercivity
lost ball keying
A construction keying method that uses a tiny ball(s) in the pin stack to allow construction master key operation. The ball(s) may be removed from the pin stack without disassembly of the cylinder
low coercivity
A low energy form of magnetic encoding measuring 300 Oe which is not very resistant to accidental erasure
lug door
A usually rotatable safe door which has projections that interlock with the safe body to retain the door
MACS
Abb. maximum adjacent cut specification
magic number
For an SFIC, a value from which subtracting the control cut depth will result in the correct top pin size, or, subtracting the top pin size will result in the control cut depth
magnetic contact
An electrical switch activated by magnetic attraction or repulsion
magnetic latch
A latch which uses magnetic force to stay engaged with its strike
magnetic stripe
A thin layer of material consisting of oriented ferromagnetic oxide particles held together by a resin binder and bonded to a non-magnetic surface such as paper or plastic
magnetically positioned pin
A pin tumbler requiring magnetic energy to position it, rather than springs or gravity
maid's master key
The master key in a hotel master key system given to the maid. It operates only cylinders of the guestrooms and linen closets in the maid's designated area
maison key system
[From the French, meaning "house" key system] a keying system in which one or more cylinders are operated by every key (or relatively large numbers of different keys) in the system; e.g., main entrances of apartment buildings operated by all individual suite keys of the building
man door
A door designed to allow access by a person. It may be located in a wall, or in another, larger, door which has other purposes
man trap
A sally port designed for pedestrian traffic
manipulate
A dialing process typically used with combination locks to determine operational status of the lock, potential combinations or attempt to free the mechanism
manipulation
A opening method for mechanical combination locks which uses the tolerances of that lock to determine an opening combination
manipulation key
Any key other than a correct key which can be variably positioned and/or manipulated in a keyway to operate a lock or cylinder
manipulation proof
A combination lock with features designed to prevent determining the combination without physical attack
manipulation resistant
A combination lock with features that prevent determining the combination without physical attack within a specific time limit
manual dogging
1. an exit device that requires a physical action to dog it, 2. using a wrench or a special key to dog an exit device
manufacturer reset code
In an electronic lock, a factory-set or user-set code or combination that will restore the factory default settings
master blank
A key blank used in a complementary keyway lock, on which only the master key combination is intended to be cut
master code
In an electronic lock, a factory-set or user-set combination that must be used before programming the lock
master disc
A special disc tumbler with multiple gates to receive a sidebar, see also "master pin" #1, see also "stepped tumbler"
master key
1. a key which operates all the master keyed locks or cylinders in a group, each lock or cylinder usually operated by its own change key, 2. to combinate a group of locks or cylinders such that each is operated by its own change key as well as by a master key for the entire group, 3. an automotive key which operates all or most locks on a vehicle where there is also a valet key employed
master key changes
The number of different usable change keys available under a given master key
master key system
1. any keying arrangement which has two or more levels of keying 2. a keying arrangement which has exactly two levels of keying
master keyed
1. of or pertaining to a cylinder or group of cylinders which are or are to be combinated so that all may be operated by their own change key(s) and by additional key(s) known as master key(s) 2. a warded lock whose warding has been designed to allow different hierarchies of keys to operate
master keyed only
Of or pertaining to a lock or cylinder which is or is to be combinated only to a master key
master lever
A lever tumbler which can align some or all other levers in its lock so that their gates are at the fence. It is typically used in locker locks
master pin
1. usually a cylindrical shaped tumbler, flat on both ends, placed between the top and bottom pin to create an additional shear line 2. a pin tumbler with multiple gates to accept a sidebar
master ring
A tube shaped sleeve located between the plug and shell of certain cylinders to create a second shear line. Normally the plug shear line is used for change key combinations and the shell shear line is used for master key combinations
master ring lock/cylinder
A lock or cylinder equipped with a master ring
master wafer
A ward used in certain binary type disc tumbler key-in-knob locks, see also "master pin" #1, see also "stepped tumbler"
mat switch
A flat semi flexible device which opens or closes a circuit when rated pressure is applied
matrix format master keying
A method of generating combinations and assigning key symbols in a master key system through the use of a matrix
maximum adjacent cut specification
The maximum allowable difference between adjacent cut depths
maximum compound cut specification
The maximum allowable difference between the different depths of a compound cut
maximum opposing cut specification
The maximum allowable depths to which opposing cuts can be made without breaking through the key blade. This is typically a consideration with dimple keys
MCCS
Abb. Maximum Compound Cut Specification
media safe
A security container designed to maintain an internal temperature at which multi-media will remain reliable for a set period of time
medium stile
Pertaining to an aluminum or hollow metal door with a stile generally between 3-1/4 and 4-1/4 inches wide
mesh change
A type of hand change combination lock wheel, consisting of an inner and outer wheel which engage each other by intermeshing teeth
metal desk lock
A cabinet lock with a vertically sliding bolt located at the rear of the cylinder
meter lock
1. a padlock whose shackle consists of a single removable post, designed for locking utility meters or valves. 2. any of several small devices specifically designed to lock utility meters or valves and which require either a key or special wrench for removal
milling cutter
A key machine cutter with relatively coarse pitch teeth as opposed to a rotary file cutter
milling runout
The distinctive shape caused by the curved surface of milling cutters at the bow end of a key blade
mis-cut
1. of or pertaining to a key which has been cut incorrectly 2. a mis-cut key
MK
Abb. master key
MKCS
Abb. modified key coding system
MK'd
Abb. master keyed
MK'd only
Abb. master keyed only
MK section
Abb. master key section
MOCS
Abb. maximum opposing cut specification
modified key coding system
A modification of the standard key coding system, in which the TMK of a system with three or more levels of keying has a single letter name, and keys at lower levels are named following SKCS conventions
Mogul cylinder
A pin tumbler cylinder with a diameter of 2.0", whose pins, springs, key, etc. may also be proportionally increased in size. It is frequently used in prison locks
monitor pin
A device that requires a specific mechanical feature on a key, such as a protrusion or the lack of a cut in a specific area, to allow the lock to operate
monitored door
A door equipped with a device that reports, or reports and records, the operational status of the door, lock or other hardware
mop plate
A narrow plate fixed to the bottom of a door for protection against soiling from a mop; similar to a kickplate
mortise
1. to prepare by removing stock material from the edge of a door, drawer, frame or opening to create a recess which allows the flush fit or insetting of relevant lock or other hardware, 2. the cavity prepared by mortising, 3. of or pertaining to a locking device designed to fit in a mortise preparation
mortise cylinder
A threaded cylinder typically used in mortise locks of American manufacture
mortise exit device
An exit device designed for mortise installation
mortise lockset
A lockset the case of which is designed to fit in a mortise in the edge of a door or drawer
motion alarm lock
A security locking device which audibly alerts upon sensing motion
movable key insert
Any device pressed into or connected to a key blank, such that its presence and movement are required for proper key operation, and the absence of which results in a lockout
movement
A mechanical, electronic or electro-mechanical timer, designed to inhibit the final unlocking of a combination lock or timelock
MP
Abb. manipulation proof
MR
Abb. manipulation resistant
MS
Abb. Maximum Security. A trademark of the Adams Rite Manufacturing Co.
mullion
A vertical center post in the frame of a pair of doors
multi-color finish
Of or pertaining to a lockset whose finish is different for different trim components on one side of a door
multi-part key
Any bit key not able to be duplicated by a single casting process
multi-point lock
A lock which has more than one bolt which are thrown and withdrawn simultaneously, often in more than one direction
multi-section key blank
A key section which enters more than one, but not all keyways in a multiplex key system
multiple gating
A means of master keying by providing a tumbler with more than one gate
multiplex key blank
Any key blank which is part of a multiplex key system
multiplex key system
1. a series of different key sections which may be used to expand a master key system by repeating bittings on additional key sections. The keys of one key section will not enter the keyway of another key section. This type of system always includes another key section which will enter more than one, or all of the keyways. 2. a keying system which uses such keyways and key sections
muntin
A structural member in a door or window used to divide a large lite into smaller ones
mushroom pin
A pin tumbler, usually a top pin, which resembles a mushroom. It is typically used to increase pick resistance
mykey chart
A matrix depicting user requested cross keying by listing keys along one axis and openings along the other. So named because it is frequently accompanied by the statement "My key goes here and here and here."
narrow stile
Pertaining to aluminum doors with stiles generally between 1-3/4 and 2-3/4 inches wide
national service provider
A nationwide maintenance contracting company who supplies the sub-contracted services of a local technician to a customer
NCK
Symbol for "no change key," primarily used in hardware schedules
neck (of a key)
1. the portion of a bit key between the shoulder and the bit(s) 2. the portion of a cylinder key between the shoulder and the bow
negative locking
Locking achieved solely by spring pressure or gravity which prevents a key cut too deeply from operating a lock or cylinder
nest
A unitized group of safe deposit boxes, see also 'tumbler nest'
neuter bow
The bow of a key which is unidentifiable to a particular lock manufacturer
NFPA 80
National Fire Protection Association standard for fire doors and other opening protectives
NFPA 101
National Fire Protection Association life safety code
NFS
Abb. non-fail safe
nib ward
A ward formed from a lock case by bending part of the case into the path of the key
nickel silver
A brass alloy containing nickel used in making some key blanks and tumblers
night latch
A rim mounted auxiliary latch bolt
NKR
Abb. non key retaining
NLSA
Abb. National Locksmith Suppliers Association
NMK
Abb. a notation used to indicate "not master keyed" and is suffixed in parentheses to a regular keying symbol. It indicates that the cylinder is not to be operated by the master key(s) specified in the regular keying symbol; e.g., AB6(NMK)
nominal keyset
A keyset listed with an "X" prefix in a cross keyed cylinder designation
non-control chamber
A chamber in an IC which does not have a separate shear line for the control function
non-fail safe
A feature of a security device designed to remain engaged, for security purposes, during a power loss
non-handed
Pertaining to hardware that is manufactured in a way, which allows installation on doors of any orientation without requiring modification or adjustment to accommodate the door orientation
non key retaining
Of or pertaining to a lock whose key can be removed in both the locked and unlocked positions
non-keyed
Having no provision for key operation Note: This term also includes privacy function locksets operated by an emergency key
non-original key blank
Any key blank other than an original
non-removable key
A key which has one or more cuts on it which trap the key in the lock upon insertion
non-removable pin
Pertaining to a hinge whose pin can not be removed when the door is closed
non-reversible
Door hardware whose hand cannot be changed in the field
non-sized closer
A door closer with infinitely adjustable closing force between specific sizes
nose
The part of a non-cylinder lock which contains the keyway and rotates within a horn
nose puller
A tool used to remove the nose of a lever tumbler lock and allow access to the tumblers
NRK
Abb. non-removable key
NRP
Abb. non-removable pin
NSO
Abb. National Safemans Organization
NSP
Abb. National Service Provider
NUR
Abb. nurse's key
nurse's key
A selective master key used in a hospital keying system
O.b.
Abb. operated by, as used in keying schedules
occupancy type
The use to which an area of a building is put with reference to the prevailing life safety or building code
odometer method
A means of populating the KBA as a counter from the TMK combination
Oe
Abb. oersted
oersted
A unit of magnetic field strength which is commonly used in the magnetic recording industry
offset cam
A cam which is bent to have its ends in different planes
oil cup
A receptacle for lubricant on a machine
one bitted
Of or pertaining to a cylinder which is or is to be combinated to keys cut to the manufacturer's reference number one bitting
one column progression
A process wherein key bittings are obtained by using the cut possibilities in one column of the key bitting array
one pin master key
A master key for all combinations obtained by progressing only one bitting position
one shot
Of or pertaining to a wire run that has an unobstructed line of sight
one-way deadbolt
A deadbolt operable from only one side of a door
open back strike
A strike, typically used on double door applications, that has an unenclosed opening opposite the lip edge
open face dial
A combination lock actuator designed to have all the numbers visible at once
open gated
Pertaining to a lever tumbler whose gate is in the edge of the tumbler
open loop
A detection circuit where continuity between branches will result in a reportable condition
opening index
The index or mark to which a combination is dialed in order to effect an opening
operating key
Any key which will properly operate a lock or cylinder to lock or unlock the lock mechanism and is not a control key or reset key, see also "change key"
operating shear line
Any shear line which allows normal operation of a cylinder or lock
original key blank
A key blank supplied by the lock manufacturer to fit that manufacturer's specific product
out of time
Of or pertaining to a condition where a mechanical part is misoriented and cannot function correctly
outside drive
A safe lock that is gear driven by a spindle located outside of the lock case opposite the lock bolt or on either side of the lock case
overhead concealed closer
A closer designed for installation out of view in the door header area
overhead stop
A door stop which contacts the door near the top
overlifting
1. a picking technique using a blank key to raise the tumblers to the top of the keyway, 2. a lock defeat process that uses a comb attack to bypass the normal locking combination, 3. a process that moves a spring loaded tumbler beyond the operating point
override code
In an electronic lock, a factory-set or user-set combination that will always open the lock
override combination
In certain locks with a user changeable combination, a second combination which allows access at all times. It is usually factory set and may not be field changeable
pack
The set of tumblers in a lever tumbler or combination lock
packing
Material used to provide sealing between chambers of a door closer
paddle handle
A type of actuator which is relatively flat and operates the mechanism when pivoted on an axis near one end
padlock
A detachable and portable lock with a shackle which locks into its case
padlock eye(s)
A fixture typically of flat material or material bent at a 90 degree angle, with a hole to receive the shackle of a padlock. Usually used in pairs
page master key
The three-pin master key for all combinations listed on a page in the standard progression format
panic button
Any switching device in an alarm system designed to be activated by a person in a panic situation. It creates an immediate alarm condition
paracentric
1. of or pertaining to a keyway with one or more wards on each side projecting beyond the vertical center line of the keyway to hinder picking 2. of or pertaining to a key blank made to enter such a keyway
parallel arm
A type of door closer and/or closer mounting which leaves the arm generally parallel to the door face when closed
parity
The property of being either even or odd, as the depth number of a bitting in a combination, or the possible progressives in a given position of a two step progression
parity pattern
The collective description of the parities of a group of bitting positions in a two step progression, typically expressed in an even/odd sequence, e.g. EOOEEO
passage set
A latchset
Passive Anti-Theft System
An RFID security system used by Ford which enables the vehicle's ignition system when a properly recognized transponder key is validated
passive infrared device
A device used to detect motion by detecting changes in heat
passive relocking device
A device that places its bolts only upon attack to the safe or lock
patented unrestricted keyway
A specific keyway which is sold without restriction by a lock maker, but which retains patent protection against non-original key blank makers
pattern key
1. an original key kept on file to use in a key duplicating machine when additional keys are required, 2. any key which is used in a key duplicating machine to create a duplicate key
PATS
Abb. Passive Anti Theft System
pawl
The cam of certain automotive cylinders
peanut cylinder
A mortise cylinder of 3/4" diameter
peel
To destructively attack a safe by removing or partially removing the sheet metal of the door front or the outer surface of one of the other sides
peep hole
A small lens or opening which allows a limited view through a door
perforated tumbler
A combination wheel with multiple holes within its diameter for mounting the fly
personal identification number
A series of numbers and/or letters associated with a particular individual as a means of identification
photo-electric detection device
A detection device actuated by abrupt changes in light
piano lock
A lock designed to secure the keyboard cover to the lower section of a piano frame
pick
1. a tool or instrument, other than the specifically designed key, made for the purpose of manipulating tumblers in a lock or cylinder into the locked or unlocked position through the keyway, without obvious damage. 2. to manipulate tumblers in a keyed lock mechanism through the keyway, without obvious damage, by means other than the specifically designed key
pick gun
A machine designed to impact all of the bottom pins of a pin tumbler lock at exactly the same time and thereby bounce the top pins beyond the shear line
pick key
A type of manipulation key, cut or modified to operate a lock or cylinder
Pillar lock
1. a lock mounted in a vertical support member, typically of a vehicle or furniture, 2. (obsolete) a lock mounted on a vehicle door
pin
To install pin tumblers into a cylinder and/or cylinder plug, see also "pin tumbler"
PIN
bb. personal identification number
pin chamber
The corresponding hole drilled into the cylinder shell and/or plug to accept the pin(s) and spring
pin change
A combination lock that requires manually relocating the fly(s) to change a combination
pin kit
A type of keying kit for a pin tumbler mechanism
pin stack
All the tumblers in a given pin chamber, see also"pin stack height"
pin stack height
The measurement of a pin stack, often expressed in units of the lock manufacturer’s increment or as an actual dimension
pin tray
See "layout tray"
pin tumbler
Usually a cylindrical shaped tumbler. Three types are normally used: bottom pin, master pin and top pin
pin tumbler push key (padlock)
A type of padlock that requires pushing the key inward to disengage the shackle after insertion of the key creates a shear line
pin tweezers
A tool used in handling tumblers and springs
pinning block
A holding fixture which assists in the loading of tumblers into a cylinder or cylinder plug
pinning chart
A numerical diagram which indicates the sizes and order of installation of the various pins into a cylinder. The sizes are usually indicated by a manufacturer's reference number which equals the quantity of increments a tumbler represents
pippin file
A file with a cross section that resembles a pip, or apple seed
PIR
Abb. passive infra-red
pitcher handle
Lock trim which serves as a pull and is generally perpendicular to the door at its top mount, then bends and tapers to its bottom mount
pivot
A hinge with a fixed pin and knuckle, forming a single joint
plasma cutter
Tool that uses electricity and air pressure to cut various metals
plug
The part of a cylinder which contains the keyway, with tumbler chambers usually corresponding to those in the cylinder shell
plug follower
A tool used to allow removal of the cylinder plug while retaining the top pins, springs, and/or other components within the shell
plug holder
A holding fixture which assists in the loading of tumblers into a cylinder plug
plug retainer
The cylinder component which secures the plug in the shell
plug spinner
A tool which rotates a picked cylinder plug so quickly in the desired direction that it cannot lock during its rotation
plunge cut
To cut a key with a single motion for each cut position, bringing the cutter and key together to alter the height of the blade
plunger lock
Any of various spring-loaded locks or cylinders which move in or out to accomplish a locking function
pocket door
A door which opens by sliding into a hollow wall
pocket strike
An electric strike which does not require a face cut in the door jam, yet allows operation of the boltwork of the door lock, often by manipulating the locking and deadlatching portions via end pressure
poke hole
A hole designed to allow tools to poke into or through it, generally for accessing a retainer
pressure bar handle
A hand operated lever which is used to apply force to close and seal a fire and/or explosion resistant safe or vault door so the bolts may be thrown
pressure bar wheel
A hand operated wheel which is used to apply force to close and seal a fire and/or explosion resistant safe or vault door so the bolts may be thrown
pull bump key
A lock picking key that must be pulled from the lock one space position between impacts
pulse dialer
A telephone communication device, normally activated by an alarm, that uses electrical pulses to dial a predetermined number
punch proof spindle
A spindle that is shouldered or tapered inward to prevent it from being driven into or through the mechanism
push plate
A generally flat and commonly rectangular trim mounted for hand contact to push open a door
push bump key
A lock picking key that centers itself after each impact
pop out lock
A plunger lock usually used on vending machines to prevent operation of a T-handle
positive latching
The condition of a door being secured such that manual operation of the latch or bolt mechanism must occur before it may be opened
positive locking
The condition brought about when a key cut which is too high forces its tumbler into the locking position. This type of locking does not rely on gravity or spring pressure
positional master keying
A method of master keying typical of certain binary type disc tumbler key-in-knob looks and of magnetic and dimple key cylinders. Of all possible tumbler positions within a cylinder, only a limited number contain active tumblers. The locations of these active tumblers are rotated among all possible positions to generate key changes. Higher level keys must have more cuts or magnets than lower level keys
post (of a key)
The portion of a bit key between the tip and the shoulder, to which the bit(s) is attached
post (of a lock)
1. a part of a lock that serves as a guide for a drilled key and prevents entry of a non-drilled key, 2. the center bearing surface of a mechanical combination lock that the wheels rotate on
power locks
Electrically or electro-pneumatically operated locks
power pack
A battery with a special configuration designed for use in a specific product
practical key changes
The total number of usable different combinations available for a specific cylinder or lock mechanism
pre-assembled lockset
A lock designed to be installed into a cutout in the edge of a door. The lock body and most or all of its trim need no further assembly other than securing it to the door
prep
1. the location and dimensions of the cut out(s) and reinforcing in a door or frame required to accept a piece of hardware. 2. v. to prepare a door or frame for installation of a lock or other hardware
prep key
A type of guard key for a safe deposit box lock with only one keyway. It must be turned once and withdrawn before the renter's key will unlock the unit
primary key
A key, which operates the ignition, lock on a vehicle. It may or may not also operate some or all the other locks on the vehicle
privacy key
A key which operates an SKD cylinder, see also "emergency key"
profile cylinder
A cylinder with a usually uniform cross section, which slides into place and usually is held by a mounting screw. It is typically used in mortise locks of non-U.S. manufacture
profile pin
A stationary pin placed in the plug of a pin tumbler lock to act as a ward to produce a keyway
progress
To select possible key bittings, usually in numerical order, from the key bitting array
progression
A logical sequence of selecting possible key bittings, usually in numerical order from the key bitting array. 2. a system of generating keys with different cut combinations for unknown positions, when a partial bitting is known
progression chart
A list of combinations to consider when fitting keys to a lock with only a partial bitting known, typically arranged to minimize the number of key blanks needed
progression column
A listing of the key bitting possibilities available in one bitting position as displayed in a column of the key bitting array
progression list
A bitting list of change keys and master keys arranged in sequence of progression
progressive
Any bitting position which is progressed rather than held constant
proprietary
Of or pertaining to a keyway and key section assigned exclusively to one end user by the lock manufacturer. It may also be protected by law from duplication
protected key
A physical key that affords legal remedies against duplication
PRP
Abb. "Proficiency Registration Program"; a locksmith certification program administered by ALOA
public way
Any parcel of land essentially open to the outside air and permanently appropriated to the public for public use and having a clear width and height of not less than 10 ft
pull handle
Trim for gripping to apply pulling force to a door
pull plate
A generally flat and commonly rectangular trim with an attached handle for pulling open a door
Pullman keeper
A type of keeper which is shaped to operate with the radiused contour of a Pullman latch
Pullman latch
A type of latch which pivots like a hinge and whose locking side is radiused
pulse dialer
A telephone communication device, normally activated by an alarm, that uses electrical pulses to dial a predetermined number
punch proof spindle
A spindle that is shouldered or tapered inward to prevent it from being driven into or through the mechanism
push plate
A generally flat and commonly rectangular trim mounted for hand contact to push open a door
push button lock
A self contained lock with controls that must be pressed in a specific pattern or sequence to open the lock
push key padlock
A padlock whose shackle is released by full insertion of the key into the lock
quadrant
A dutch door lock with a bolt that is 1⁄4 of a circle
rabbeted door
A door having and edge contoured with an offset creating two surfaces which form an overlap at the abutting edge
rabbeted lock
A lock with a face or front which is specially formed to use in a rabbeted door
radio frequency identification
An identification technology using short range radio frequency transmission
radiused blade bottom
The bottom of a key blade which has been radiused to conform to the curvature of the cylinder plug it is designed to enter
rail
The horizontal construction member located on the top and bottom of a door
rake (rake & hang)
A picking technique that attempts to use quick withdrawal of the pick to set the tumblers
random master keying
Any undesirable process used to master key which uses unrelated keys to create a system
randomized order
1. an arrangement of cut depths in a KBA without numerical order, 2. an arrangement or list, such as a bitting list, in which the information is sorted in no easily discernible pattern
rap
1. to unlock a plug from its shell by striking sharp blows to the spring side of the cylinder while applying tension to the plug 2. to unlock a padlock shackle from its case by striking sharp blows to the sides in order to disengage the locking dogs
ratchet lock
Any lock which incorporates a ratchet device allowing locking in more than one position
rated
Of or pertaining to a product's compliance with one or more recognized standards such as UL
read
To decode a lock combination visually without disassembly of the lock or cylinder
read key
A key which allows access to the sales and/or customer data on certain types of cash control equipment (e.g., cash register)
reader
device used in an access control system to interrogate an electronic, magnetic or optical type of credential
rear drive
Of or pertaining to a combination lock with the wheel pack located between the dial and the drive cam
recombinate
To change the combination of a lock, cylinder or key
record safe
A safe whose primary purpose is to preserve paper documents against fire
recore
To rekey by installing a different core
redundant button
A secondary release switch for an egress device to allow unlocking in case of a malfunction of the primary release switch
reference position
Usually a numerical designation for a tumbler position within a lock or a cut position on a key, typically counted from the stop
register groove
The reference point on the key blade from which some manufacturers index the bitting depths
register number
1. a reference number, typically assigned by the lock manufacturer to an entire master key system 2. a blind code assigned by some lock manufacturers to higher level keys in a master key system
rekey
To change the existing combination of a cylinder or lock
relock trigger
The part of a safe relocking device which causes the mechanism to activate
relocking device
Any device intended to prevent normal opening of a safe as a result of an attack, two types are typically used, internal and external
remote release
A mechanism for permitting the unlocking of any lock device at a distance from the device
removable core
One whose design limits its installation to one or more specific types of housing or shell from a given manufacturer
removable cylinder
A cylinder which can be removed from a locking device by a key and/or tool
removable dial
A combination lock actuator that may be taken from the lock when not in use
removable shackle
Referring to a type of padlock which is unlocked by removing the shackle from the case
removal key
he part of a two-piece key which is used to remove its counterpart from a keyway, see also "control key" #1 & #3, see also "construction breakout key"
renter's key
A key which must be used together with a guard key, prep key or electronic release to unlock a safe deposit lock. It is usually different for every unit within an installation
repin
To replace pin tumblers, with or without changing the existing combination
reset code
In an electronic lock, a factory-set or user-set code or combination that will restore all factory default settings except the current reset code and the audit trail
reset key
1. a key used to set some types of cylinders to a new combination. Many of these cylinders require the additional use of tools and/or the new operating key to establish the new combination. 2. a key which allows the tabulations on various types of cash control equipment (e.g., cash registers) to be cleared from the records of the equipment
resettable tumbler
A tumbler which can have its reference position altered by reorientation within the cylinder without disassembly
resistor pellet
The encapsulated resistor with exposed contacts installed in a key, such as that for VATS
restraint
A device designed with a shackle that restricts the movement or actions of a person, such as handcuffs
restricted
Of or pertaining to a keyway and corresponding key blank whose sale and/or distribution is limited by the lock manufacturer in order to reduce unauthorized key proliferation
retainer
A component which is clipped, staked, or driven in place to maintain the working relationship of other components
retainer pin
1. a component seated on a spring, in the end of a plug, that interacts with a retainer cap to keep it in place. 2. Any non-threaded rod that maintains the relationship of two or more different parts
retrofit lever
A lever handle designed to replace the knob of a lockset
return
1. the extension of a cam which bends back towards the mounting surface and the measurement of the remaining distance from the mounting surface to the end of the cam, 2. the distance from a door face to the tip end of a lever handle
reveal
The distance measured from the trim surface of the jamb to the leading face of the door on the stop side when closed
reverse bevel
Pertaining to the bevel of a door which swings towards the outside
reverse keyway
A keyway shape that is a mirror image of another
reverse strike
A strike used for rim mounted hardware used on reverse bevel doors
reversible
Pertaining to hardware that is manufactured in a way, which allows field assembly or adjustment to accommodate installation on doors with different orientations
reversible key
A usually symmetrical key which may be inserted either way up to operate a lock
RF
Abb. Radio Frequency
RFID
Abb. radio frequency identification
RH
Abb. right-hand
RHR
Abb. (right hand reverse bevel)
RHVD
Abb. right hand vertical down
RHVU
Abb. right hand vertical up
right hand (man door)
Pertaining to an inward swinging door with hinges on the right side, using the outside of the door as reference
right hand reverse bevel (door)
Pertaining to a right handed door which swings outward
right track
The farthest right bitting surface of a sidewinder key, as the wider surface of the blade is viewed with the bow of the key nearest the observer
rim cylinder
A cylinder typically used with surface applied locks and attached with a back plate and machine screws. It has a tailpiece to actuate the lock mechanism
rim exit device
An exit device mounted on the door surface
rim lock
A lock or latch typically mounted on the surface of a door or drawer
rim vertical rod exit device
A vertical rod exit device mounted on the door surface
ring key
A key attached to a ring to be worn on the finger
RL
Abb. The title "Registered Locksmith" as awarded by ALOA
RLD
Abb. relocking device
RLT
Abb. relock trigger
RM
Abb. row master key
root depth
The dimension from the bottom of a cut on a key to the bottom of the blade
rose
A usually circular escutcheon
rotary file cutter
A key machine cutter with very fine teeth which are formed by stamping, such as a file
rotary disc tumbler
A circular tumbler with one or more gates. Rotation of the proper key aligns the tumbler gates at a sidebar, fence or shackle slot
rotating constant
One or more cut(s) in a key of any level which remain constant throughout all levels and are identical to the top master key cuts in their corresponding positions. The positions where the top master key cuts are held constant may be moved, always in a logical sequence
rotating constant method
A method used to progress key bittings in a master key system, wherein at least one cut in each key is identical to the corresponding cut in the top master key. The identical cut(s) is moved to different locations in a logical sequence until each possible planned position has been used
round back
Pertaining to a rim cabinet lock whose mounting flanges and case form the general shape of a circle when viewed from the back
round cornered latch
Of or pertaining to a latch mounting plate with radiused corners
rounded front
A lock front or face plate that is radiused to match the edge of the door
row master key
The one-pin master key for all combinations listed on the same line across a page in the standard progression format
RS-485
An Electronics Industry Association (EIA) standard for serial multipoint communications commonly used in online access control systems for distances up to 4000 feet
RST
Abb. the title "Registered Safe Technician" as awarded by NSO
S/A
Abb. sub-assembled
safe
A substantial, secure container with varying degrees of security and/or fire resistance, used to store valuables against fire or theft
safe deposit
A typically key accessed container that requires dual key operation, usually located inside a vault
safe deposit function
An operational characteristic of a lock which requires two separate keys working in tandem to open the lock
safe deposit lock
A lock that typically requires two separate keys to access a container
safe door
That portion of a safe used to gain access to the contents of the safe in a normal day to day manner
sally port
An access control area with doors or gates secured by interlocks such that only one may be opened at a time
sash lock
A type of window lock
SAVTA
Abb. Safe and Vault Technicians Association
SBCCI
Abb. Southern Building Code Congress International
scalp
A thin piece of metal which is usually crimped or spun onto the front of a cylinder. It determines the cylinder's finish and may also serve as the plug retainer
Scandinavian padlock
A cast case padlock with an elliptical cross section. The locking mechanism is a set of rotating disc tumblers, which engage notches in the cast shackle and may be rotated by the angled cuts cast on the key
scan tool
An automotive diagnostic tool used to read fault codes, and in some cases configure or program various modules or keys
screen door lock
A lock designed for the thin stiles typically found on screen and storm doors
screw change (wheel)
A perforated tumbler that may have its combination set by placement of a screw in one of the perforations
screwless knob
A mortise lock knob assembly secured to the spindle without screws
screwless rose
A mortise lock rose installed without screws
SDB
Abb. safe deposit box
seal
A single use device intended to give recognizable evidence to the physical opening or entry of a door, container, or space
second generation duplicate
A key reproduced from a first generation duplicate
secondary key
A key which operates certain locks on a vehicle, but not the ignition lock
secret gate latch
A small keyless rim latch, which when properly installed, is operated by pressing a concealed actuator
sectional trim
A design that uses two or more escutcheons on the same side of a door for a single lock
security collar
1. a protective cylinder collar, see also "cylinder guard"
security leg keyway
A key section and keyway design that incorporates two non-curved planes of the key blade intersecting at an angle between 1 and 89 degrees
segmented follower
A plug follower sliced into sections which are introduced into the cylinder shell one at a time. It is typically used with profile cylinders
selective key system
A key system in which every key has the capability of being a master key. It is normally used for applications requiring a limited number of keys and extensive cross keying
selective master key
An unassociated master key which can be made to operate any specific lock(s) in the entire system in addition to the regular master key(s) and/or change key(s) for the cylinder without creating key interchange
self closing
Pertaining to doors or covers which have a continuous force applied in the closing direction
semi-automatic key machine
A machine capable of duplicating keys with limited manual operations
sequence of progression
The order in which bitting positions are progressed to obtain change key combinations
series wafer
A type of disc tumbler used in certain binary type disc tumbler key-in-knob locks. Its presence requires that no cut be made in that position on the operating key(s)
serrated fence
A fence with "V" shaped notches on a contact surface to inhibit manipulation
serrated tumbler
1. a disk tumbler with "V" shaped notches in its sides that do not allow operation, 2. a lever tumbler which has "V" shaped notches in the contact end near the gate, 3. a pin tumbler with "V" shaped grooves around its circumference, 4. a combination wheel with "V" shaped notches along its outside diameter
service code
In an electronic lock, a factory set or user set code or combination that will open the lock one time
service hole
1. an aperture aligned with each chamber, providing a path for the ejector pin to drive the entire pin stack from an IC, 2. a hole in a cylinder shell intended to provide access for rekeying without disassembly of the cylinder
service panel
The back cover of a safe door which must be opened or removed to allow access for repairs
servicemark keyway
Any keyway whose shape has been configured to receive protection under trademark or servicemark law
set screw
A screw used to fasten a component in a fixed position relative to another component
set-up key
A key used to calibrate some types of key machines
set-up plug
A type of loading tool shaped like a plug follower. It contains pin chambers and is used with a shove knife to load springs and top pins into a cylinder shell
seven column progression
A process wherein key bittings are obtained by using the cut possibilities in seven columns of the key bitting array
seven pin master key
A master key for all combinations obtained by progressing seven bitting positions
sex bolt
A nut and bolt set used to through bolt, with a closed nut basically flush with the mounting surface creating the appearance of a carriage bolt
SFIC
Abb. Small Format Interchangeable Core
shackle
1. the part of a padlock, which passes through an opening in an object or fits around an object and is ultimately locked into the case 2. the portion of a restraint which fits around the wrist, ankle, neck, waist or thumb
shackle retaining pin
A pin which keeps an unlocked shackle heel in the case
shackle spring
A spring which pushes the shackle into the open position when the padlock is unlocked
shank
1 the part of a bit key between the bow and the stop; or, if there is no shoulder stop, the part between the bow and the near side of the bit, 2. a smaller diameter portion of a knob that is positioned between the larger portion of the knob and the rose or the door surface
SHDA
Abb. Security Hardware Distributors Association (formerly NLSA)
shear-head bolt
A threaded fastener which is designed to have the head break off when the correct torque is reached
shear line
A location in a cylinder at which specific tumbler surfaces must be aligned, removing obstruction(s) which prevented the plug from moving
shell
The part of the cylinder which surrounds the plug and which usually contains tumbler chambers corresponding to those in the plug
shim
1. a thin piece of material used to unlock the cylinder plug from the shell by separating the pin tumblers at the shear line, one at a time 2. to unlock a cylinder plug from its shell by using a shim
shipping pin
A pin or block used to prevent relockers from accidentally firing during shipment of a safe or vault door
shoe
1. a bracket which attaches the arm of a door closer to the door or frame 2. the surface mounted case and guide components of an exit device 3. a mortise lock component which transfers pivoting motion of a thumbpiece to linear movement of the latch bolt
shoulder
A projection from a key that can be any key stop other than a tip stop, see also "bow stop". Some shoulders on keys serve no functional purpose
shoulder stop
One that serves as a stop to position the key in a lock or cylinder
shouldered chamber
A pin chamber with an internal shelf that limits travel of a complementarily shaped bottom pin
shouldered pin
A pin tumbler shaped as to prevent it from fully entering an unoccupied keyway or limit its travel within a pin chamber
shouldered spindle
In a safe lock, a spindle with a larger uniform diameter toward outside to prevent punching the spindle into the container
shove knife
A tool used with a set-up plug which pushes the springs and pin tumblers into the cylinder shell
showcase lock
Normally a ratchet lock or plunger lock used on bypassing doors
shrouded shackle
A shackle which is protected from cutting or tampering by design or by the use of secondary shields
shunt switch
A maintained contact switch, often key operated
shut out key
Usually used in hotel keying systems, a key which will make the lock inoperative to all other keys in the system except the emergency master key, display key, and some types of shut out keys
shut out mode
The state of a hotel function lockset which prevents operation by all keys except the emergency master key, display key, and some types of shut out keys
shutter
1. a spring-loaded device which closes upon the removal of a cylinder tailpiece, protecting a locking device from being manipulated, 2. a spring-loaded device which covers a cylinder keyway when the key is not in it
shutter spring
A spring which returns the shutter on a lock to the closed position
sickle key
key in the form of a sickle inserted through a hole in a door to actuate a bolt on the opposite side of the door
side milled key
Any non-automotive key with bitting(s) milled into, but not through, one or both of the widest sides of the key blade
side milling slotter
A key machine cutting wheel with a squared edge that can cut on the side as well as the periphery of the wheel
side sheath
A portion of a multi-part pin tumbler lock plug used to complete the shear line fully around the plug
side ward
A ward which prevents entry of an incorrect key into a non-cylinder lock
side ward cut
A cut made into a key to bypass a side ward
sidebar
A cylinder locking member mounted longitudinally in a plug, which engages multiple tumblers
sidebar lock
A lock mechanism which incorporates a sidebar
sidecode variant
A master keying style of pin tumbler locks which uses the keying capabilities of the secondary security technology to effect master keyed locking. Obtaining a single key in the system does not reveal the same secondary combination of all keys
sidewinder key
An automotive key whose bitting surface(s) are serpentine grooves, generally cut into the wider surface of the key blade
silent signal
Describes an alarm that annunciates detection to a remote location instead of a local location
simple latch
A non-deadlocking latch
simplex key section
A single independent key section which cannot be used in a multiplex key system
simultaneous retraction
A feature which allows retraction of both the deadbolt and latchbolt in the same operation
single acting (door)
A door which swings from the latched position in only one direction
single-acting lever tumbler
A lever tumbler which must be moved a minimum distance to allow travel of a bolt, but cannot be moved so far as to restrict travel of the bolt
single cylinder
Pertaining to a lock with key operation from only one side
single-D
The shape of a cutout for a lock, circular except for a flat section on one side
single key section
An individual key section which can be used in a multiplex key system
single step progression
A progression using a one increment difference between bittings of a given position
six column progression
A process wherein key bittings are obtained by using the cut possibilities in six columns of the key bitting array
six pin master key
A master key for all combinations obtained by progressing six bitting positions
SKCS
Abb. standard key coding system
SKD
Symbol for "single keyed", normally followed by a numerical designation in the standard key coding system; e.g., SKD1, SKD2, etc. It indicates that a cylinder or lock is not master keyed but is part of the keying system
skeleton key
Any non-cylinder key whose bit, blade, and/or post is cut away enough to allow it to enter and turn in locks with different ward arrangements
slide hammer
A tool made from a rod with a handle, a sliding weight on the rod, and a means of attaching to a part to force its movement relative to other parts
slider
A tumbler which is normally flat, has a gate and moves with a linear or lateral motion instead of pivoting like a lever tumbler
slim jim
A narrow strip of spring steel used to bypass the cylinder and unlock vehicle doors
sling
A cable or layered length of fabric, (usually the latter), with woven loops in both ends, used to lift a safe or vault door with a boom arm lift or forklift
slotter
A key machine cutter designed to make cuts with a rectangular shape
Small Format Interchangeable Core
An IC that replicates the functionality and design popularized by Best
smartcard
A card conforming to ISO specification 7810 and 7816 which one or more integrated circuits with contacts allowing interface to external equipment
SMK
Abb. sub-master key
SMNA
Abb. Safe Manufacturers' National Association
smokeproof
Referring to an area or opening protected against the penetration of smoke
smoking (a key)
The action of holding a key or blank over an open flame so that it collects carbon
snap bow
1. a separate bow which can be affixed to a smaller key bow, 2. a bow which retrofits transponder technology to conventional keys for use in access control systems
software key
Data used by software to provide or deny access. See also 'hardware key'
SOP
Abb. Sequence of Progression
spacing
The dimensions from the stop to the center of the first cut and/or to the centers of successive cuts
spanner wrench
A tool for installing, removing or adjusting a threaded part. The tool is designed to engage one or more holes or depressions which are peripheral or not on-center to the part axis
spare tire lock
A lock designed to prevent removal of a vehicle's spare tire
special application cylinder
Any cylinder other than a mortise, rim, key-in-knob or profile cylinder
spider cam
A rotary mechanism serving to simultaneously control the operation of multiple bolts with a radial arrangement
spider lock
A lock that utilizes a special cam as an integral part of the lock to extend or retract the multiple bolts of the lock simultaneously
spindle
A component which transfers rotary motion from outside a lock or latch case to an inner mechanism
Spirolox washer
A spiral retaining ring which has a flat coiled structure to hold parts on a post
spline
1. a groove in a combination lock spindle designed to accept a spline key, 2. the cavity(s) in the shell of a wafer tumbler lock which allows extension of the tumblers to a locked position
spline key
A device inserted to position the drive cam relative to the spindle in a combination lock
spline way
A notch in a combination lock drive cam designed to accept a spline key
split astragal
An astragal constructed of two pieces; each piece being mounted on either door of the pair, and abutting to create a seal
split bolt
Two separate bolts housed in the same opening in a face of a lock, each operated independently from opposite sides of the door
split finish
Of or pertaining to a lockset whose finish is different on each side of the door
split hub
A two-piece hub which can allow motion from one side of a swivel spindle while preventing it from the other side
split pin master keying
A method of master keying a pin tumbler cylinder by installing master pins into one or more pin chambers
split spindle
A multi-piece spindle which allows a knob or lever to be installed on only one side of a door
split wafer
Disc tumblers which are approximately half the width of a full tumbler used in the same lock, and are paired adjacent to one another in the same cut position. Typically used in automotive locks
spool pin
A pin with a uniform smaller diameter except at its ends. Typically a top pin used to augment pick resistance but also observed as bottom and master pins
spring cover
A device for sealing one or more pin chambers
spring hinge
A hinge incorporating a mechanism to apply automatic closing force
spring latch
A latch operated under spring pressure, having no deadlatching feature
spring seat
The point at which a spring is anchored, located or attached and at which (from which) it exerts force
spring tab
The part of a disc tumbler that serves as a spring seat
spy-proof dial
A combination lock component complemented by a spy proof dial ring to limit the viewable numbers' being dialed
spy-proof dial ring
A combination lock component that limits the viewable numbers on a compatible dial
square back
Pertaining to a rim cabinet lock whose mounting flanges and case form the general shape of a square
square corner latch
A latch with a face whose sides meet at 90 degree angles
stand alone
A self contained electronic lock device
standard key coding system
An industry standard and uniform method of designating all keys and/or cylinders in a master key system. The designation automatically indicates the exact function and keying level of each key and/or cylinder in the system, usually without further explanation
standard progression format
A systematic method of listing and relating all change key combinations to all master key combinations in a master key system. The listing is divided into segments known as blocks, horizontal groups, vertical groups, rows, and pages, for levels of control
standards
A set of specifications relating to materials, finishes, construction, resistance, or strength that typically establish a minimum acceptable value
staple
The portion of a hasp assembly with the hole or opening to receive a padlock
status switch
A device, usually electro-mechanical, which can provide information to a system as to whether the protected opening is open or closed, or position of a latch
step pin
A spool or mushroom pin which has had a portion of its end machined to a smaller diameter than the opposite end. It is typically used as a top pin to improve pick resistance by some manufacturers of high security cylinders
stepped tumbler
A special (usually disc) tumbler used in master keying. It has multiple bearing surfaces for blades of different key sections
stile
The vertical construction member located on either edge of a door
stop (of a door)
The projecting portion of a doorframe upon which the door rests when closed
stop (of a key)
The part of a key from which all cuts are indexed and which determines how far the key enters the keyway
stop gauge
The part of a key machine that aligns a key blank, a pattern key, or both, so that the blank may be cut correctly
stop works
A button or toggle mechanism which prevents operation of a knob, lever or thumbpiece in a non-bored lock
stop works button(s)
A one or two-piece stop works activator
store door function
A lockset function in which: a) a deadbolt is operated by key from either side and a latch is operated by working trim from either side; or b) a deadlocking latch can be withdrawn by working trim from either side except when both sides are locked by key from either side
STPRP
Abb. "Safe Technicians Proficiency Registration Program"; the certification program of SAVTA as administered by ALOA
straight knife
A bypass tool for manipulating a spring bolt directly behind the cylinder plug
strike
A bolt receptacle typically mounted in the door jamb or the floor
strike locator
A tool used to mark the jamb, relative to the bolt of the lock, prior to strike installation
strike reinforcer
A metal plate mounted behind a strike, using long screws to secure it to the door frame
strike through keying
A means of shaping a key bitting by tooling which presses the key in such a way as to leave an indentation on one bitted surface or side of the key, and a protrusion on the other
stump
The stationary fence(s) in a lever lock
sub-master key
The master key level immediately below the master key in a system of six or more levels of keying
subordinate control key
One of the lower level control keys available when master keying the control function of an interchangeable core or removable core
substitution code
A code whose individual characters are converted to individual key cuts or combination numbers by means of a reference table
Suffolk latch
A door latch consisting of a horizontal bar which moves vertically to unlatch on the inside, actuated by a thumb piece on the outside
supervised security seal
A device which provides visual indication of tampering and includes the ability to be connected into electronic security systems
surface pull
A handle or grip attached to the surface of a door or drawer
surreptitious entry
The use of entry or bypass techniques that cannot be detected via disassembly and detailed inspection of lock components
sweep
The radiused part of a lever tumbler with which the key makes contact
sweep speed
The speed at which a closer moves a door from open to the point where latching speed is engaged
swing clear hinge
A hinge that allows the door to swing far enough away from the jamb to fully clear the opening at 90 degrees open
switch lock
1. a lock which incorporates an electrical switch as an integral part of its construction 2. a large padlock designed for use on railroad switches
swivel spindle
Normally a two-piece spindle assembly whose two halves are designed to turn independently
t-b
Abb. tip-to-bow
T-handle
A T-shaped handle assembly which may be lockable
T-strike
A strike whose lip spans the middle portion (but not the full height) of the strike
tactile
Of or pertaining to a knob, lever or other device to open a door, which conveys a special sense of touch; typically used as a warning to the visually impaired of danger on the other side of the door
tailpiece
An actuator attached to the rear of the cylinder, parallel to the plug, typically used on rim, key-in-knob or special application cylinders
talon
The part of a lever lock bolt that is relieved to allow the key to enter and move the bolt
tamper resistant fastener
Any one of several screws or nuts which have a specialized head, requiring a special-access tool for removal
tamper switch
A sensor that signals when someone attempts to access the mechanism of a security device
TCP
Abb. transmission control protocol
TCP/IP
The system networks use to communicate with one another
telescoping bolt
The bolt of a locking device which extends and retracts by successive overlapping sections
telescoping column
A steering column adjustable for length
template
A pattern used to mark cutout locations for hardware installation
template hinge
A hinge with dimensions, hole locations and tolerances which conform to ANSI standard A156.7
tension washer
A flexible washer under a wheel pack in some combination locks for adjusting tension on that wheel pack
tension wrench
A tool used to apply torque to a lock bolt or cylinder plug while attempting picking
theoretical key changes
The total possible number of different combinations available for a specific cylinder or lock mechanism
thermal lance
An instrument, used for cutting with a pure oxygen feed, that uses itself and the material being cut as fuel
thermal relocker
A relocking device which is activated by heat
thimble
The raised round part of a mortise lock escutcheon that the knob seats upon
threaded rose
A rose with an internally threaded ferrule
three column progression
A process wherein key bittings are obtained by using the cut possibilities in three columns of the key bitting array
three pin master key
A master key for all combinations obtained by progressing three bitting positions
three point latch
A self-latching device designed to latch a door at the top, bottom and edge
throat cut
The cut made into a key to bypass a throat ward
throat ward
An obstruction formed in a lock's case or horn at the point of key entry, which prevents key rotation
throw
The distance a bolt or latch projects from the faceplate or case of a lock in the extended position
throw member
An intermediate actuator which engages the rear of the plug to transfer motion to a cam, tailpiece or other actuator
thumb cuffs
Restraints designed to lock on the thumbs
thumb index
A projection of metal on a key bow which serves as a tactile means of orienting a non reversible key for correct lock insertion
thumb latch
A lock with a thumbpiece to actuate the latch
thumb side
1. the side of a flat single sided cylinder key on the left when the cuts are on the top edge , 2. the side of a tubular key on the left when the positioning nib is on the top, 3. the side of a cruciform key on the left when the uncut rib is on the bottom
thumb stop
he part of a rim latch that can be used to lock the bolt in either the retracted or extended position until released
thumb turn
A actuator which can be turned by thumb and forefinger
thumb turn cylinder
A cylinder with a turn knob rather than a keyway and tumbler mechanism
thumbpiece
A generally flat, projecting latch actuator found above a grip handle and depressed by the thumb
tilt column
A steering column design which permits vertical adjustment of the steering wheel
time delay
A feature which prevents operation until a set amount of time has elapsed. Activation normally begins when access, egress or other unlocking is desired
time delay lock
A lock that has a mechanism for preventing unlocking until a specific amount of time has passed
time lock
A secondary device which prevents movement of a bolt or boltworks until a set amount of time has elapsed. The device is normally set or activated at the time of locking
timing
The engagement or positioning of an assembly of internal parts so as to produce the desired sequence of engagement during operation
tip
The portion of the key which enters the keyway first
tip stop
A type of stop located at or near the tip of the key
tip to bow
A specification that a bitting combination is recorded starting at the tip and proceeding to the bow
tips & stems
A key bow and shank that uses a detachable end with a bit(s) on it
TL-15
A U.L. rating given to a container whose door has been tested against forcible entry, with common hand tools, for a period of 15 man minutes
TL-30
A U.L. rating given to a container whose door has been tested against forcible entry, with common hand tools and/or abrasive cutting wheels and power saws, for a period of 30 man minutes
TMK
Abb. top master key
toe (of a shackle)
That part of the shackle, which may be removed from the padlock body
toggle
A pivoting one-piece stop works activator
token
A self-contained electronic key
tolerance
The deviation allowed from a given dimension
tone dialer
A telephone communication device, normally activated by an alarm, that uses a series of tones to dial a predetermined number
top control key
The highest level control key when master keying the control function of an interchangeable core or removable core
top-down order
An arrangement of potential key cut depths within a KBA beginning at the shallowest and continuing to the deepest
top jamb mount
Surface application of a door closer body directly to the header
top master key
The highest level master key in a master key system
top of blade
The bitted edge of a single bitted key
top pin
Usually a cylindrical shaped tumbler, usually flat on both ends and installed in direct contact with the spring in the pin stack
total position progression
A process used to obtain key bittings in a master key system wherein bittings of change keys differ from those of the top master key in all bitting positions
touch bar
A type of exit device actuator which typically does not pivot and retracts the bolt with a minimum of pressure
touch pad
1. an exit device actuator with a paddle shape 2. a remote door opener activator, typically electric or electronic, which facilitates handicap access
track
The bitting surface of a sidewinder key formed when it is cut
trailing face
The door face farthest from the strike side of the jamb when the door is open
transom catch
A surface mounted latch, typically having an actuator operated by a long pole or an attached pull chain
transponder key
A key with an electronic component which can convert a radio signal into an electrical current enabling the key to transmit a unique code back in return
trap
An indicator which, once disturbed, wittingly or unwittingly, alerts those setting it to an attempted covert entry
tri-bolt
Referring to a three point locking system usually found on round door safes
tri spoke handle
A safe handle that has 3 extensions off the main hub
trick lock
A lock which requires successful operation of one or more moving panels, concealed buttons, etc., often in addition to normal operation by key and/or combination
trim
Exposed components of a lockset or latchset, which allow operation, enhance appearance or provide protection
trim panel
The decorative and functional assembly, which covers the inside surface of a vehicle, door
triplex spindle
A spindle with three wedge shaped bars which spread to grip the inside of the knob shank when the knob set screw is tightened
TRTL-15x6
A U.L. rating given to a container when it has been tested against forcible entry, on all six sides, with common hand tools and/or abrasive cutting wheels, power saws, and oxy-fuel gas cutting or welding torch for a period of 15 man minutes
TRTL-30
A U.L. rating given to a container where the door has been tested against forcible entry with common hand tools and/or abrasive cutting wheels, power saws, and oxy-fuel gas cutting or welding torch for a period of 30 man minutes
TRTL-30x6
A U.L. rating given to a container when it has been tested against forcible entry, on all six sides, with common hand tools and/or abrasive cutting wheels, power saws, and oxy-fuel gas cutting or welding torch for a period of 30 man minutes
TRTL-60
A U.L. rating given to a container where the door has been tested against forcible entry with common hand tools and/or abrasive cutting wheels, power saws, and oxy-fuel gas cutting or welding torch for a period of 60 man minutes
trunkslammer
Someone who doesn't have, or want, state-of-the-art capabilities and does shoddy work
trunnion
The part of a lever lock that accepts the key and stabilizes it, typically a single piece or an assembly consisting of some combination of a nose, guide and foot
trunk lock
1. a hinged strap with a staple or a lock at the end that mates with a receptacle in the trunk, 2. a lock designed to secure the trunk of an automobile
try-out key
A manipulation key which is usually part of a set, used for a specific series, keyway, and/or brand of lock
TTL
1. transistor transistor logic, 2. time to live
T-strike
A strike whose lip spans the middle portion (but not the full height) of the strike
tube
A hollow cylindrical pipe passing through a safe or vault door from the lock to the front of the door
tube horn
A protrusion designed into the back of a combination lock case for attachment of the tube
tube nut
A hexagonal nut used to attach the dial ring to the tube on a safe lock
tubular key
A key with a tubular blade. The key cuts are made into the end of the blade, around its circumference
tubular key cylinder
A cylinder whose tumblers are arranged in a circle and which is operated by a tubular key
tubular lockset
A bored lockset whose latch or bolt locking mechanism is contained in the component installed into the edge bore
tubular pick
A pick designed to operate a tubular key lock
tumbler
A movable obstruction of varying size and configuration in a lock or cylinder which makes direct contact with the key or another tumbler and prevents an incorrect key or torque device from activating the lock or other mechanism
tumbler nest
A position within a lock designed to accept a tumbler pack, it typically includes a tumbler post and a spring rest
tumbler pack
A complete set of lever tumblers for a given lock
tumbler post
A rod mounted in a lever lock, upon which the pivoting ends of the tumblers are in turn mounted
tumbler separator
A thin spacer placed between lever tumblers to reduce friction
tumbler spring
Any spring which acts directly on a tumbler
turn
A lock, latch or exit device part which is contacted to achieve the normal operation. It may be a knob, lever or thumb turn
turn disk
A disk shaped component with a cam actuated by a thumb turn, normally used in a mortise lock
twisting tumbler
A pin tumbler which must rotate to a specific position to allow plug rotation
two column progression
A process wherein key bittings are obtained by using the cut possibilities in two columns of the key bitting array
Two in one pick
A tool designed to open lever locks where bolt pressure and lever manipulation are applied simultaneously
two pin master key
A master key for all combinations obtained by progressing two bitting positions
two point lock
A lock with two bolts which are thrown and withdrawn simultaneously, often in more than one direction
two-step progression
A progression using a two increment difference between bittings of a given position
TXTL-60
A U.L. rating given to a container where the door has been tested against forcible entry with common hand tools and/or abrasive cutting wheels, power saws, and oxy-fuel gas cutting or welding torch and may further include nitroglycerin or other high explosives for a period of 60 man minutes. The total quantity of explosives employed may not exceed 8 ounces. Not more than 4 ounces is to be used in a single charge
type 1
A UL rating given to an electronic combination lock able to withstand 20 man-hours of expert manipulation as well as other specifications as listed in UL 2058
type 1F
A UL rating given to an electronic combination lock able to withstand 20 man-hours of expert manipulation as well as other specifications as listed in UL 2058. The lock also meets U.S. Federal Specifications FF-L-2740
type 2
A UL rating given to an electronic combination lock able to withstand specifications as listed in UL 2058
UL
Abb. Underwriters Laboratories
UL fire resistive container classifications class 125
A group of UL classifications for containers that maintain inside temperatures less than 125 degrees Fahrenheit when exposed to a fire of specific temperature and duration. The times and fire temperatures are: 1⁄2 hour 1700 degrees F. 1 hour 1700 degrees F. 2 hour 1850 degrees F. 3 hour 1925 degrees F. 4 hour 2000 degrees F.
class 150
A group of UL classifications for containers that maintain inside temperatures less than 150 degrees Fahrenheit when exposed to a fire of specific temperature and duration. The times and fire temperatures are: 1⁄2 hour 1700 degrees F. 1 hour 1700 degrees F. 2 hour 1850 degrees F. 3 hour 1925 degrees F. 4 hour 2000 degrees F.
class 350
A group of UL classifications for containers that maintain inside temperatures less than 350 degrees Fahrenheit when exposed to a fire of specific temperature and duration. The times and fire temperatures are: 1⁄2 hour 1700 degrees F. 1 hour 1700 degrees F. 2 hour 1850 degrees F. 3 hour 1925 degrees F. 4 hour 2000 degrees F.
UL listed
Listed in a directory as having passed specific Underwriters Laboratories testing
unassociated change key
A change key which is not related directly to a particular master key through the use of certain constant cuts
unassociated master key
A master key which does not have change keys related to its combination through the use of constant cuts
uncombinated
1. of or pertaining to a cylinder which is or is to be supplied without keys, tumblers and springs 2. of or pertaining to a lock, cylinder or key in which the combination has not been set
uncontrolled cross keying
A condition in which two or more different keys under different higher level keys operate one cylinder by design; e.g., XAA1 operated by AB, AB1. Note: This condition severely limits the security of the cylinder and the maximum expansion of the system, and often leads to key interchange
underlifting
A process that moves a spring loaded tumbler to a point short of the operating point to form a shear line
unibolt
A single plate of steel used in place of individual multiple bolts to lock a safe door
unidirectional cylinder
A cylinder whose key can turn in only one direction from the key pull position
USB key
A hardware key connected to a USB port
valet key
An automotive key that operates all locks except storage compartments, on a vehicle where there is also a master key to operate all locks
VATS
Abb. Vehicle Anti-Theft System
VATS key
A key for some General Motors vehicles which contains a resistor chip that must be qualified by the vehicle in order to run
VATS interrogator
A device which determines the resistor value required to complete the ignition circuit. It also reads the value of the resistor in a VATS key
vault
A secure room in which objects of value are stored
VD
Abb. vertical down
Vehicle Anti-Theft System
An electronic system in some General Motors vehicles which uses a resistor pellet of varying value imbedded in a mechanical ignition key
vertical down
Of or pertaining to a mounting orientation of a safe or vault lock such that the bolt projects downward
vertical group master key
The two-pin master key for all combinations listed in all blocks in a line down a page in the standard progression format
vertical rod exit device
An exit device with bolts typically at the top and bottom of a door connected to a central mechanism by rods
vertical up
Of or pertaining to a mounting orientation of a safe or vault lock such that the bolt projects upward
VGM
Abb. vertical group master key
virtual keyway
A secondary locking mechanism combination used as a method of discriminating between suppliers for key control
vise arm
The movable jaw of a key machine vise
vise nut
A nut, with an external design to facilitate use without tools, that works in conjunction with the vise stud to tighten the vise on a key machine
vise stud
A threaded post mounted to the carriage of a key machine to provide a means of tightening the vise
visual key control
A specification that all keys and the visible portion of the front of all lock cylinders be stamped with standard keying symbols
VKC
Abb. visual key control
VU
Abb. vertical up
wafer tumbler
1. a flat tumbler which must be drawn into the cylinder plug by the proper key so that none of its extremities extends into the shell 2. a flat, usually rectangular tumbler with a gate which must be aligned with a sidebar by the proper key
walk-in vault
A vault with a man door and open floor space inside
wall safe
A safe installed in a wall so that only the door and a frame is visible
ward
A usually stationary obstruction in a lock or cylinder which prevents the entry and/or operation of an incorrect key
ward cut
A modification of a key which allows it to bypass a ward
warded
Having one or more wards
warded key
A key with ward cuts only, typically a bit key, flat steel key or corrugated key
Warnock Hersey
An independent testing laboratory
wheel lock
1. a lock which prevents rotation of a wheel, 2. a lock which prevents removal of a wheel
wheel pack
An assembly of combination wheels
wheel puller
A tool used to remove the steering wheel from a column
wide stile
Pertaining to aluminum and hollow metal or wood doors with stiles 5 inches wide or larger
window bug
An alarm system component designed to detect breaking glass
wipe tool
1. a device used to decode lever lock combinations by an arc contact with the configured lever/belly characteristic shape, 2. a tool for cleaning the hidden part of an automotive window to facilitate viewing of linkage
witness mark
The change in the surface finish of metal resulting from pressure contact, as in impressioning
working trim
ock or exit device trim which activates a mechanism
X
Symbol used in hardware schedules to indicate a cross-keyed condition for a particular cylinder; e.g., XAA2, XlX (but not AX7)
Yale, Linus, Jr.
he American inventor of the pin tumbler mortise lock and its replaceable cylinder component
yoke
A component designed to secure cylinders or turn disks in both sides of a mortise lock by means of a single setscrew
yoked
A mechanical system uniting two or more combination locks with the ability to be unlocked by any lock or a series of locks
Z-wire
1. a wire bypass tool with two opposing right angle bends, for retracting a spring latch, 2. a wire tension wrench for the control lug in certain IC padlocks
zero bitted
Of or pertaining to a cylinder which is or is to be combinated to keys cut to the manufacturer's reference number "0" bitting