Exit Control Glossary of Terms
Courtesy of Detex
A B C D E F G H I J K L M N O P Q R S T U V W
125kHz
Radio transmission operating at 125 thousand cycles per second. This technology has historically been the standard for proximity cards/readers
128 Bit AES
A specification for the encryption of electronic data using a 128 bit symmetric key algorithm
13.56MHz
Radio transmission operating at 13.56 million cycles per second. This technology has historically been the standard for smart cards/readers
161 Prep
Cutout (or hole) in a door for bored/cylindrical locksets. Also known as Cylindrical Lock Prep
26 Bit Format
The most common data format for RFID badges. It consists of 4 components. Even Parity (1 Bit), Facility Code (8 Bits), Card # (16 Bits) and Odd Parity (1 Bit)
3DES (TDEA)
Triple DES is a specification for the encryption of electronic data which applies the data encryption standard three times to each block
86 Edge Prep
See mortise lock prep
Access Control
Controlling entry of people into buildings, rooms, and racks, and controlling the use of keyboards and equipment, by the use of automated devices that either read information stored on an object such a card (what you have), receive a code or password (what you know), or recognize a physical trait by biometric analysis (what you are)
Access Credential
A medium that contains encoded information, such as ID cards, key fobs, & smart chips
Access Devices
Electronic and/or mechanical products developed to control entry and/or egress. Access devices can be single technology or a combination of technologies including card and keypad or card and code
Access Hole
Hole in outer body of the lock mechanism providing entree to the lock retrainer
Access Level
A logical group of doors paired with a time schedule used to determine when and where a card is granted access
Access Point
A place along the perimeter of a secure area where there is a door/gate/portal and some type of access control method to screen users attempting entry to the area
Active Case
Case of panic device which contains the latching mechanism
Active Detector
A sensing device which functions by transmitting energy. There are several types of active detectors including microwave, photoelectric, infrared, and ultrasonic
Active Door (in a pair of doors)
The leaf that opens first and the one to which the lock is applied
Actuating Bar
The activating mechanism of an exit device is located on the egress side of a door and extends at least half the width of the door. The active surface of the actuating bar shall be visually and physically distinct from the rest of the device. AKA cross bar or pushpad
Actuator
Mechanism of a switch that operates the contacts. An actuator can be a door release
Actuator arm
Lever connecting the directional switch to the directional lever on some cars equipped with a dimmer switch on the steering column
ADA
Americans with Disabilities Act
ADA Requirements
The Federal “Americans with Disabilities Act” requires that buildings be accessible and contains specific requirements for doors
Adjustable Latch / Bolt
Latch/bolt mechanism for cylindrical locks that can fit either a 2-3/8" backset or a 2-3/4" backset
Adjustable Mortise Cylinder
A mortise cylinder whose length can be changed to fit the installation
Adjustment / Repair
Any action that could affect the outcome of a test conducted during an AAADM inspection
AHC
Indicates that the individual so identified is a qualified Architectural Hardware Consultant and member of the Door and Hardware Institute
AHJ
Authorities having Jurisdiction
Alarm Condition
When an alarm system detects and signals that something has occurred such as an intrusion, a fire or hold-up
Alarm input
A monitoring point on a panel that checks the status of a device, typically digital (open/closed). Through the use of resistors, they may also monitor a normal/alarm/short/open
Alarm System
A combination of devices that detect and react to any abnormal condition
Allen Wrench
See Hex Key
All-Glass Slider
A sliding door package including a heavy glass panel that has no vertical stiles
ALOA
See Associated Locksmiths of America
Alternating Current
An electric current that reverses its direction regularly and continually. The voltage alternates its polarity and direction of current flow negative to positive. AC current increases to a peak, decreases through zero and peaks in the opposite direction. AC current flows back and forth in the conductor and is expressed in cycles per second or Hertz (Hz)
Ambient Temperature
The temperature of the air in the immediately surrounding environment
Americans With Disabilities Act
An act passed to ensure the rights of the physically disabled. This act in part requires building to provide easier access for the physically impaired. Also known as ADA
Ampere (A, amp)
The unit of measurement for the rate of electrical current flow, characterized by the symbols 'I' (in Ohm's law formulas) or 'A.' One ampere is the current flowing through one ohm of resistance at one volt potential
Ampere/hour (AH)
A measurement of a battery's capacity. One ampere of current flowing for one hour equals one ampere/hour
Anchor
A device used to attach a door frame to the surrounding structure or wall
Angle Bar
1. In a combination lock, a pivoting bar, which has the fence at its free end. 2. In a certain type of door lock, a steel bar which locks one end in the lock case, and the other end in a metal plate in the floor
Angle Bar Door Lock
A lock which mounts on the inside of an inswinging door, having a steel bar set at an angle, to connect the lock case with a metal plate on the floor
Angle of Cut
Cuts made at an angle other than perpendicular across the key blade. These include any offset angle
Annunciator
An audible and/or visual signaling device
Annunciator Vault Lock
A type of lock, made to be used on a vault's inner gate. An annunciator vault lock is designed to give a signal (for example ringing of a bell) every time the lock is opened
Anodizing
Production by electrical means of corrosion resistant film of oxide on the surface of aluminum and its alloys. Anodizing can be accomplished in a variety of different colors
ANSI
The American National Standards Institute (ANSI) is a private, non-profit organization that administers and coordinates the U.S. voluntary standardization and conformity assessment system
ANSI Cut-Out
A standardized cut-out furnished on many rated and non-rated doors and frames
Anti-collision
The process built into an RFID system that protects multiple cards from being read at the same time when within the readers RF field
Anti-Drill Ball Bearings
Ball bearings used to protect the shear line of a cylinder lock or placed in front of a combination lock's drill points. The purpose is to resist unauthorized entry
Anti-Drill Lunes
Small, hardened pieces of metal, shaped like a crescent moon. They can be installed into the housing of a lock cylinder to resist drilling. Their purpose is to resist unauthorized entry
Anti-Drill Rods
Small, hardened metal rods used to protect the shear line of a cylinder lock or placed in front of a combination lock's drill points. These variable shapes and sizes of anti-drill rods are designed to resist unauthorized entry
Anti-Dust Plate
See Dust Cover
Anti-Friction Latch
A device incorporated into a latch bolt to reduce the closing pressure required
Anti-Friction Bearing
Any bearing having the capability of effectively reducing friction
Anti-Friction Latch Bolt
A latch bolt designed to reduce friction when the bolt starts to engage the lock strike
Anti-Liftout Pin
See Door Edge Pin
Anti-Masking Circuit
An anti-masking circuit identifies any attempt to cover or obstruct the operation of certain infrared sensors
Anti-Passback
Refers to a systems ability to track an individuals in/out status at a facility, typically through entrance and exit card readers. Once a person has entered, they cannot enter again until they have exited
Anti-Tamper Switch
A normally-closed switch mounted into the cover of an electronic component. The switch is opened if the cover is removed, signalling unauthorized access. See also Tamper Switch
Anti-Theft
Products designed to prevent theft
Anti-Wedge
Specially shaped padlock body with raised shoulders that covers the front and sides of the shackle
API
Application Programming Interface is a source code interface that is provided in order to support requests to be made by other computer programs and/or allow data to be exchanged
Approach Mat
A control mat that causes the door to open when activated
Approach-Side
The side from which a person activates an automatic door
Architectural Hardware
Term applied to all hardware used in building construction but particularly that used on or in connection with doors, windows, cabinets and other movable members
Armed
The condition of an alarm system when it has been turned on
Armor Plate
A plate similar to a kick plate but covering the door to a greater height, usually 40" (1040 mm) or more from the bottom
Armor Plate Hasp
A hasp manufactured from case hardened alloy steel
Armored Face
A mortise lock that has a metal plate on the door edge. The armored face covers the lock cylinder set screws. The cylinder set screws are protected and cannot be loosened without first removing the armored Face. See also Armored Front
Armored Front
A lock that consists of two plates: one, the under plate, is fastened to the case and is unfinished; two, the finish plate, is fastened to the under plate and when in place covers the cylinder set screws thus protecting them from tampering. Used on mortise locks. See also Armored Face
Associated Locksmiths of America
The national trade association for retail, commercial, and institutional locksmiths
Astragal
A molding or strip whose purpose is to cover or close the gap between the edges of a pair of doors. Some types overlap, others meet at the center line of the gap. See Coordinator
Attaching Screws
Screws used to fasten a lock and/or locking mechanism to the door
Attendant's Key
Single key used in mental institutions to operate patient room locks in various buildings and possibly under different master keys. This special key eliminates cross keying, but must be set-up at inception of the master key system
Audit Trail
A record of transactions that can be used by an interested party to trace an access control activities during a specific time period
Automatic Door
The combination of door, operator, and controls constituting the system
Automatic Extension Flush Bolt
A flush mounted locking device for the inactive leaf of a pair of doors. When the active leaf is opened, the inactive leaf is capable of being pushed open and when it closes, the bolt latches automatically by the closing of the active leaf and is held latched by the active leaf
Automatic Key Machine
Duplicates cylindrical keys automatically once the key and the key blank are positioned in the vises. Some automatic key machines brush the duplicated key after it is cut
Automatic Latching Two Point Bolts
A surface or concealed mounted top and bottom locking device for the inactive leaf of a pair of doors. It is manually unlocked to open, but when the leaf is closed, the bolts latch automatically
Auto Re-Arm
Alarm sounds if the door is opened in the armed condition, and will automatically re-arm 2 minutes after the door is closed
Auxiliary Dead Latch
A supplementary latch that automatically deadlocks the main latch bolt when the door is closed. Also called Deadlocking Latch Bolt
Auxiliary Latch
A separate secondary latch which is depressed by the strike when the door is closed. The auxiliary latch deadlocks the latch bolt. See also Auxiliary Dead Latch
Auxiliary Lock
Any secondary lock installed onto a door
Availability Percentage
A calculated prediction of a system’s percentage of “uptime.” For mission-critical facilities, the goal is “five "nines” or 99.999% - less than 5 minutes of downtime per year
Back Check
Optional feature in hydraulic door closers slowing the opening swing of door somewhere between 60 and 85 degrees of opening. Designed to protect an object be hind the door. Not intended to act as an overhead stop
Back Plate
A flat or nearly flat piece of metal, usually having three holes. Two of the holes are for mounting screws and the third hole is for the tail piece to extend into the locking mechanism
Back-Up Power Supply
Source of power which will operate the alarm and/or access control system should the primary power source stop. Back-up power supplies can either be battery or generator, depending upon site requirements and the law
Backset (of a hinge)
The distance from the edge of the door to the hinge
Backset (of a lock)
The horizontal distance from the face of the lock to the center line of knob hub, keyhole or cylinder (Measured from the high side of a beveled door)
Ball Bearing
A solid metal sphere. There are a number of functions for ball bearings in locks and locking mechanisms. Some examples are 1. ball bearings are used to increase drill resistance at critical points to stop entry. 2. Used as a tumbler in pin stacks. 3. Embedded into the key of a specific lock manufacturer this "floating" ball bearing operates two blocking pins
Ball-Bearing Hinge
A hinge equipped with ball bearings between the hinge knuckles to reduce friction (See Anti-Friction Bearing)
Ball Bearing Pin Tumbler
A type of tumbler pin which is flat on both ends, and is placed in a pin chamber above a ball bearing. The ball bearing makes contact with the key. The purpose of using this design is to cut down on the amount of wear caused by repeated insertion and removal of the key
Ball Catch
A push and pull fastening with a mortised case designed to hold the door in the closed position. Also known as a friction catch
Ball Detent
A spring loaded steel ball which enters into a caviry in the bolt of a combination lock when the bolt is fully extended. The ball detent acts to proper position the extended bolt
Bandwidth
The amount of data a network can transport in a given time period
Bar Code
An access control option printed onto cards that uses a series of vertical lines of various weights and positions. Some of the bar code symbologies are Code 11, Code 39, Code 93, UPC/EAN and Codebar
Bar-code Card
A type of access control card that uses an array of machine readable bars and spaces to represent the encoded information such as card number
Bar Code Reader
A reader designed to scan bar codes in order to grant or deny access
Barrel
The part of the tubular lock which surrounds the plug, inner bushing and sleeve(s)
Barrel Bolt
A type of bolt, usually of the surface-mounted kind, which has a circular cross section
Barrel Key
A key with a bit projecting from a round, hollow shank designed to fit onto a post and rotates in the keyway of the lock. Barrel keys are identified by dimensions of the neck, bit height, bit width, bit thickness and by the inner diameter (I/D) and the outer diameter (O/D) of the barrel
Barium Ferrite Card
A type of access control card that uses a pattern of magnetic spots to store information; read by laying flat on a reader. Also called a "magnetic spot card."
Base Anchor
A piece of metal attached to base of a door frame, to secure frame to the floor. Also known as Floor Anchor
Battery
A direct current (DC) electrical storage container. Batteries are available in a variety of amperate and voltages. Batteries are a power source and as a back-up power source for access control and alarm systems. Types of batteries include alkaline, dry cell, gel, lead calcium, lithium and sealed lead acid
Bellcrank
A flat metal plate used to convert movement from vertical to horizontal and vice versa
Bell Key
A type of key whose cuts are in the shape of a wavy slot milled into the sides of key blade. These wavy slots usually run the entire length of the blade
Beryllium
One of the metallic elements used in certain card operated access control systems
Bevel (of a door)
The angle of the lock edge in relation to the face of the lock stile. Standard bevel is 1/8" in 2" (3.2 mm in 50.8 mm). If otherwise detailed it must be so noted in ordering locks
Beveled Door Edge
The edge of a door which is not at a 90 degree angle to the face of the door - standard bevel is 1/8 inch in 2 inches - narrow side of door is in contact with stop of frame when door is closed
Bevel (of a lock front)
The angle of a lock front when not at right angle to the lock case, allowing the front to be applied flush with the edge of a beveled door
Bevel (of a lock)
A term used to indicate the direction in which the latch bolt is in dined: regular bevel for doors opening in, reverse bevel for doors opening out
BHMA
See Builders Hardware Manufacturers Association
BHMA Functions
01: Exit only, no trim or blank escutcheon 02: Entrance by trim when actuating bar is locked down 03: Entrance by trim when latch bolt is released by key. Key removable only when locked 04: Entrance by trim when latch bolt is released by key or set in a retracted position by key 05: Entrance by thumb piece. Key locks or unlocks by thumb piece 06: Entrance by thumb piece only when released by key. Key removable only when locked 07: Entrance by thumb piece. Inside or outside key locks or unlocks thumb piece. Outside key releases latch 08: Entrance by knob or lever. Key locks or unlocks knob or lever 09: Entrance by knob or lever only when released by key. Key removable only when locked 10: Entrance by knob or lever. Inside or outside key locks or unlocks knob or lever. Outside key releases latch 11: Entrance by control turnpiece. Key locks or unlocks control 12: Entrance by control turnpiece only when released by turning key. Key removable only when locked 13: Entrance by key or combination lock 14: Entrance by trim when latch bolt is released by knob or lever. Always active, no cylinder 15: Entrance by trim when latch is released by thumb piece. Thumb piece always active, no cylinder 16: Entrance by trim when latch is released by control turnpiece. Turnpiece always active, no cylinder 17: Entrance by control turnpiece. Inside or outside key locks or unlocks turnpiece. Outside key releases latch
Bible
The portion of a cylinder housing which contains the pin chambers. The bible is easily seen on the key-in-knob cylinders
Bi-Centric Cylinder
A lock cylinder, usually of the pin tumbler type, that has two plugs and two sets of pin chambers instead of one
Bi-Directional Key
For a one way lock cylinder, a key that will both extend and retract the dead bolt of the lock in which the cylidner is being used. Bi-directional keys are used to control access and egress between two or more key holders
Biometric Lock
A lock that is controlled by a biometric scanner, such as fingerprint, hand geometry, retina identification, etc.
Biometric System
A method of high security access control using a unique feature of the individual. For example, fingerprints, voice prints, or blood vessel pattern in the retina of an eye
Biometrics
Establishing personal identity verification using technology to measure a physical or behavioral trait - for example, a fingerprint
Bit (of a key)
The projecting blade, cut in a manner that actuates the tumblers and permits the lock bolts to be operated
Bit
The plate that is mounted onto the post of bit and barrel keys
Bit Height
The dimension of the bit from the post out
Bit Key
A key with a bit projecting from a shank. Similar to the base of the warded and/or lever lock. These keys are identified by the dimensions of the post, neck and height, width and bit thickness
Bit Key Duplicating Machine
A key machine with rotatable vise jaws capable of making cuts on the three edges of the key's bit. A slotting type cutter is used to make the cuts
Bit Key Lock
Type of lock, usually mortise style which is operated using a bit key
Bit of a Key
That part of a key which is inserted into a lock which is cut and/or milled to operate the lock
Bit Thickness
The dimension of the bit from side to side
Bit Width
The dimension of the bit from the neck forward
Bitting
The pattern of a cut or cuts in a key blade which is used to align tumblers to a shear line
Bitting Area
The portion of the key blade into which the cuts are made
Blade
The part of the key which contains the distinctive pattern of cuts
Blank
1. An uncut or the unfinished key as it comes from the manufacturer. 2. A key before any cuts have been made on it. See also Key Blank
Blind Bolt
A type of bolt lock that can be operated only from one side of a door, and has no visible parts on the other surface of the door
Blind Code
1. Term used for any code number which is not a direct digit code. 2. Name assigned to an unused key combination for future reference
Blind Code Card
A plastic card supplied by a manufacturer of locks and cylinders, which personalizes the code to the signer
Blind Hole Construction Master Key System
A master key system in which the construction master key is voided by inserting one of the permanent keys into the key slot, and turning the plug. When this is done, the part or parts that had allowed the construction master key to operate are forced into a blind hole in the plug and thus cease to function
Blocking Diode
An electronic device used to allow electricity to flow in only one direction
Blocking Ring
A ring the same diameter as the cylinder face, used to cover the exposed portion of a mortise cylinder
BOCA
Building Officials and Code Administration international
Bolt
The part of a lock which moves across the opening and stops the door, drawer, etc., from moving. This can be accomplished either mechanically or electrically. Bolts can be operated by the proper key, combination, code, card, hand, etc.
Bolt (Flush)
A vertical locking bolt so designed that when installed within the door, it is flush with the edge of the door
Bolt (Mortised)
A locking bolt installed within a door
Bolt (Surface)
A locking bolt installed on the surface of a door
Bolt Types
Combination lock safe bolts secure the door from being opened. They retract when proper combination is dialed and the locking mechanism is retracted. There are five basic types of these bolts. They are: Square Bolt, Center Extension Bolt, Upper Extension Bolt, Lower Extension Bolt, and a Roller Bolt
Bond Box
The removable sheet metal box inserted into the safe deposit box
Bonded
A type of liability insurance designed to protect the locksmith when performing certain services
Bond Sensor
A Hall Effect or Reed type switch that determines the grip of an electro-magnet when the door is closed. Sends a signal if the magnetic grip is reduced from approximately one-third to one-half
Bored Lock (or Latch)
Lock or latch whose parts are intended for installation in holes bored in a door
Boring Jig
A tool holder and guide used to assist in lock installation. The boring jig can be set to the required backset and ensure proper location of the drilled holes
Borrowed Lite
A four sided steel frame, which is glazed (has glass) but does not include a door. Also known as a steel window frame
Boss
Small extension on the plug's body and the housing, which when lined up appropriately allows for assembly or disassembly of a wafer or wafer side bar lock. Also known as a Tab
Bottomed Out
The Tubular pick is inserted into the keyway until the head of the pick is flush with the lock's plug
Bottom Pins
They are cylindrically shaped pins, usually made of brass, which are used to set the depth combinations in pin tumbler cylinders. They are progressively varied in length and usually tapered at one end, enabling them to sit into the "V" cuts made in key blanks. When the proper key is inserted, the top of the bottom pin levels off at the plug's shear line allowing the plug to turn and activate the locking mechanism
Bottom Shoulder
On a single-bitted key, the stop near the bow, on the side opposite the cuts in the key blade
Bottom Tumbler
Varying length cylindrical shaped object which is positioned between the spring and top tumbler in the sleeve of a tubular lock
Bow
The handle or head of a key
Box Strike
A strike which uses a box to completely enclose the lock bolt. A box strike provides additional security and a cleaner appearing installation
Break
The result which occurs when top tumbler(s) bind at the shear line in a tubular lock
Breaking
See Break
Breakaway Padlock
A padlock whose shackle is made of brittle material. This type of padlock is commonly used on fire equipment and other items which must be easily accessible and yet secured. Also known as Frangible
Breech-Block Safe Door
A circular safe door that rotates to engage a set of lugs on the body of the safe
Bridge Rectifier
Converts AC voltage to DC
Broach
A special cutter tool used by lock manufacturers, which removes metal from a plug, in order to form the shape of the keyway
Broken Key Extractor
A locksmith tool used to remove a piece from a broken key, or other foreign matter, from the keyway of a lock
Builders Hardware
See Architectural Hardware
Builders Hardware Manufacturers Association
The trade association for North American manufacturers of commercial builders hardware. Also known as BHMA
Bump
1. In the impression system of key fitting, to move the key blank against the bottom pins or wafers in the cylinder, in order to cause impressions on the surface(s) of the blank. 2. See also Rap
Burglar Alarm
A device or combination of devices which detects and reacts to an attempted intrusion or to the presence of an intruder. Also known as an Intrusion Alarm
Burglar Proof Spindle
A tapered or shouldered spindle, with hardened pins or entirely hardened, designed to prevent punching, pulling and drilling
Burnishing Tool
Tool used to clean relay contacts
Burrs
Chips or filings which remain on the blade of the key after it has been cut. Burrs usually occur when the cutter has worn. The burrs can be scraped or buffed off using a file or wire wheel
Bushing
A lining used to reduce friction between a fixed and movable part. Bushings are made of soft metals and plastics
Butler's Door
Wooden doors which swing both in and out. These spring operated hinges are designed to keep the door open at a ninety degree angle on either side
Butt (Hinge)
A type of hinge designed for mortising into the edge of the door and into the rabbet of a door frame
Butterfly Cam
See Clover Leaf Cam
Butterfly Knob
A small piece of metal in the center of many manipulation resistant combination lock dials. In this type of lock, the butterfly knob must be turned when the combination has been dialed in order to lower the fence and retract the bolt
Button Contact
Enclosed switch mounted in door or window frame
Bypass Method
A method of gaining entry in which the part of the lock mechanism that is directly operated by the key (for example, the cylinder) is bypassed. The opening of a door by shimming its spring latch with a plastic card would fit into this category of entry method
Cabinet Lock
A relatively small type of lock designed to be used on pieces of furniture and very thin doors. Cabinet locks can be operated by a key, combination dial or push buttons
Cable
A bundle of wires covered by the same covering
Cable Lock
A type of lock whose locking member is a length of cable, which is passed through the object to be locked
Caliper
A precise measuring instrument that can determine depths of cut, as well as inside and outside diameters
Cam
1. The part of a lock or cylinder which activates the bolt or latch as the key is turned. 2. A tailpiece which mounts flat onto the rear of the plug, whose operating portion is at a ninety degree angle to the plug. The cam may also act as the bolt
Cam (of a cylinder)
A rotating piece attached to the end of the cylinder plug to engage the locking mechanism
Cam Lock
A lock, often used on drawers and cabinets, which has a cam bolted to the back of its cylinder plug. The cam serves as the locking bolt. There are standard, high security, and tubular styles of cam locks
Cam Plug
A narrow stile door lock component which operates in conjunction with a lever handle to retract the dead latch
Cane Bolt
A heavy cane-shaped bolt with the top bent at right angles; used on the bottom of doors
Cap
1. The face plate component on the lock. Some lock types have built-in capts, while others have replaceable caps. 2. The spring retainer used on certain types of interchangeable cores
Capacitance Detector
A device which detects an intruder containing or in close proximity to a metal object. See also Safe Alarm
Capacitor (CAP)
An electronic component used throughout electronic circuitry for filtering, timing, current limiting, and many other uses. The value is usually expressed in terms of micro-farads and the voltage rating in terms of either AC or DC working volts
Capping Press
A manual press designed to remove and install pin chamber caps from certain styles of interchangeable cores
Card Operated Lock
A type of card access control system that is activated by inserting a card into a slot instead of using a key or dialing a combination. Using the correct card permits access through the locking door(s). There are three major types of card technologies: the Wiegand, mag-stripe, and the proximity
Card Reader
Part of an access control system through which the card is read. There are swipe, slotless, and proximity card readers
Cart Bar / Crash Bar
A bar or series of bars mounted on a door panel to protect it and the glass from breakage
Carriage
The part of a key machine that holds the key vise or vises
Carry Bar
A bar mounted onto the inactive door to automatically open the active door whenver the inactive door is opened
Case
The housing, usually metal, which contains the lock mechanism
Cased Opening
A steel frame with no stops
Casement Hinge
A hinge to swing a casement window. The term is often used to describe a hinge designed to throw the sash out far enough to permit cleaning the outside of the glass from the inside of the room on an outward-swinging casement
Casement Window
A window whose sash is hinged along one side and usually has a crank to operate window
Case Hardened
Metal lock parts which have been processed and strengthened to better resist attack. Case hardening is usually used on combination lock shackles, hasps, and bolts
Cash Drawer Cylinder
A modified mortise cylinder used in cash drawers. This type of lock cylinder usually part of its housing removed to ensure positioning within the drawer
Catch
A mis-cut key in which one or more of the tumblers binds against the housing or the plug as the key is turned. This can result when one or more of the cuts in the key is too deep or shallow
CCTV
Acronym for Closed Circuit Television
CDC
Indicates that the individual so identified is a Certified Door Consultant and member of the Door and Hardware Institute
Central Station
A company that monitors residences and businesses that have certain alarm systems. These companies "monitor" these locations 24 hours a day, 365 days a year for a monthly fee
Centrally Monitored Alarm
An alarm system which when activated sends a signal over phone lines or wires to a police station, guard booth or central station
Ceramic insert
A piece of ceramic material that is built into a dead bolt, to protect the bolt against sawing. The ceramic insert is used mainly on narrow style bolt locks
Certification Label
A label placed on a device to indicate compliance to applicable standards. Such labels can include UL, C-UL, CSA, ETL, TUV, etc.
Chain Bolt
A spring bolt actuated by a chain attached to the spring bolt for application at the top of the door
Chain Door Fastener
A device that limits the opening of a door by means of a chain
Chain Door Lock
A type of lock that has as its locking member a length of chain, and is used on a door, to eneable the user to open the door a fixed distance without having to completely unlock the door
Chamber Capping Pin
A small, disc-shaped piece of metal that is used to seal off the top of a pin chamber. This is used in certain types of removable core cylinders
Chamber Capping Screw
A small, headless screw, usually of the type driven by a hex key, which is used to seal off the tops of individual pin chambers in a certain type of pin-tumbler cylinders
Chamfering
The degree of beveling on the ends of cylindrical lock pins and tubular lock tumblers
Change Key
1. A key for operating a specific lock or group of locks having the same planned bittings. 2. The lowest level key in a master key system. 3. A special key designed to unlock combination lock wheels in order to change the combination. See also Safe Change Key
Changeable Bit Key
A type of bit key where the bit is made up of small sections, which can be taken apart and rearranged to make different combinations
Changeable Lever
An adjustable lever consisting of a detent and sweep lever. The detent lever is unlocked from the sweep lever with a change key
Changes
In lock terminology, this word usually means the different key bitting, tumbler arrangements, or combinations in a series of locks
Changing Index
The indicating mark on the dial ring used when changing the combination of a key change combination lock. Changing index may be located anywhere on the dial right
Check Valve
A device in some door closers which allows fluid to flow in only one direction
Checking Floor Hinge
A device placed in the floor that combines top and bottom pivots for hanging the door with a controlled speed dosing mechanism
Chuck Key
A tool used to tighten and loosen a drill chuck from around a drill bit
Cipher Lock
A lock that is opened by pressing its buttons in a specific sequence. It differs from a coded lock in that it typically has only 4-5 buttons, and each button can only be pressed once. The cipher lock was the mechanical precursor of today's electronic coded lock with a telephone-like keypad
Circuit
A path through which current can flow from the source through conductors and electrical devices and normally returns to the source. A closed circuit is a complete path for current to flow from the source and return to the source. Closing a switch allows current to flow as opening a faucet allows water to flow
Classification
Combination lock types are classified by Underwriters Laboratories using a Group designation including Group 1, Group 1R, and Group 2. These classifications are determined Underwriters Laboratories Standards for Safety. There are other classifications and other testing laboratories
Classroom-Intruder
Latchbolt is operated by rotating the inside lever, or rotating the outside lever only when not locked from the inside or outside key. Outside lever is locked and unlocked by turning the key inside or outside lever. Inside lever cannot be locked
Classroom Function
The inside knob or lever works at all times, but outside knob or lever works only when not locked by key. BHMA function 08
Clean Room Door Package
A door package that has special seals and characteristics to meet stringent air or particle infiltration specifications
Clevis
A metal link for attaching a chain to a padlock
Clipper
See Hand Held Code Key Cutter
Closed Circuit
A complete circuit in which current can flow
Closed Circuit Television
A self contained system for producing televised images. Commonly used for security surveillance. Also known as CCTV
Closer
See Door Closer
Closer Reinforcement
A reinforcing piece inside of a door or frame. Provides additional strength of attachment of door closers
Closing Pin
In some removable core cylinders, the top pin, or last pin inserted into a pin chamber before the spring is identified as the closing pin
Clover Bow Key
A design of key that has a bow or head with three lobes, in a pattern resembling a leaf or clover
Clover Leaf Cam
In certain types of mortise locks, a cylinder cam that has three lobes, instead of just one, to activate the boltwork of the lock
Clutch Mechanism
Components of most double cylinder locks which transfer rotational motion from one of the cylinders to operate th elocking mechanism. At the same time not requiring the second cylinder's plug to rotate
Code
An arrangement of numbers and/or letters by which a finished key can be made to operate a lock without having the original key. The code can occasionally be found on the key or lock. Therefore four types of codes: direct digit codes, silhouette codes, derivative or conversion codes, and regular key codes
Code Book
A book used by locksmiths to translate code numbers into depths and spaces, in order to originate a key to operate the lock
Code Card
Specific sized cards with m anufacturers space and depth information. These cards are designed to operate with certain code machines in order to originate keys
Code Cutter
A non-motorized machine used to originate keys. Code cutters use punch and anvil technology to make the cuts in the key
Code Machine
A device for originating a key when the depths and spaces are known
Code Number
A series of number and/or letters stamped into the head of some original keys and/or stamped in various locations on locks. This code number is then referenced in a code book to determine the tumbler depths in the lock
Coded Lock
A lock that is opened by typing a code on a keypad
Coilspring (Compression)
A spring made of wire coiled into a helix. A common spring of this type is a cylinder spring
Coilspring (Tension)
A spring made of wire coiled into a helix with the coils in close contact and an eye at each end to enable the spring to be stretched as the bolt or other parts move
Comb
1. The side bar in a type of pin tumbler cylinder that uses twisting pins and a number of possible different angles of cuts on its keys. 2. A comb-shaped tool which is used to lift the springs in a wafer side bar lock. THis tool enables the lock to be manipulated without knowing the depths of cut
Combinate
The set a combination in a lock cylinder or key
Combination
1. This term denotes the grouping together of cuts on a key, especially when different arrangements are possible. 2. The arrangement of numbers which a combination lock is set
Combination Anchor
A device for anchoring a frame to wall constructed with wood or metal stud
Combination Change
1. The act of rearranging tumblers in a lock so that the original key will no longer operate. 2. The act of rearranging the numbers which a combination lock is set
Combination Changing Index
See Changing Index
Combination Dial
In a combination lock, the circular knob that has an array of numerals and lines, or letters, around its rim
Combination Padlock
A padlock that can be opened by entering a certain combination of numbers and/or letters on a dial, or on a set of wheels or push buttons. These locks are available with resettable or fixed combinations
Combination Wafer
Used in the Schlage wafer locks, the combination wafer requires a cut in the key to enable it to stay in the unlocked position. In this position, no part of the combination wafer crosses the shear line
Combination Wheel
The part of a dial-type combination lock that discriminates between a correct number and an incorrect one, when the combination is dialed. See also Wheel
Common
The terminal in an alarm system which completes a circuit with a normally open or normally closed contact
Common Power Source
A single source of power which is used to operate the lock(s), the reader(s) and the control unit. This avoids the need for separate transformers or power supplies. Highly advantageous especially if access control system has back-up power supply
Communicating Door
A door between two adjoining rooms which are both on the inside of a building, such as two hotel rooms or two offices
Communicating Door Lock
A lock specifically designed for communicating doors which have the ability to lock the door from either side usually requireing a key to unlock from opposite side
Complementary Keyway
A keyway in the plug of a wafer or disc tumbler lock that will accept more than one key section. See also Composite Keyway
Composite Keyway
A keyway in the plug of a pin tumbler lock that will accept more than one key section. See also Complementary Keyway
Compromise
To defeat a lock, security, or access control system. To gain unauthorized entry
Compression Ring
The compression ring encircles the face and provides a space adjustment range to cover exposed portions of the mortise cylinder
Concealed Cylinder
A style of mortise cylinder which is designed to be positioned behind an armored front with only the plug face exposed
Conductor
A conductor is asubstance that offers very little resistance to current flow. Examples are copper, silver, gold and platinum
Conical Spring
A piece of round spring wire that is wound into a cone shaped spiral, and which is used in certain heavy duty key-in-knob locks
Connecting Bar
See Cylinder Bar
Connecting Rod
Found in the door, deck and tailgate locks, connecting the pawl and the locking mechanism
Console Lock
Automobile lock designed to secure the console door
Construction Ball Bearing
In a lock cylinder that is part of a construction master key system, one of a group of ball bearings which allow the construction master key to operate the cylinder, until the construction master key is voided by turning the cylinder plug with one of the permanent keys. Three ball bearings are in pin chamber five of the lock cylinder illustrated
Construction Master Key
A temporary master key, used during the construction of a building. When the building becomes occupied, a device can be activated within each of the locks causing the construction master key to be voided from that point on. After this has been done, the permanent keys will operate the locks
Contact
Electrically conductive points, or sets of points, used to make or break an electrical circuit mechanically
Contact Cleaner
A liquid which, when sprayed onto an electrical contact, or into a lock, has a cleaning effect
Contact Points
The numbers which come up under the opening index of a combination lock when the nose of the lever contacts the sides of the gate in the drive cam. The right contact area is determined by rotating the dial to the left and the left contact area is determined by rotating the dial to the right
Contact Rating
Maximum load rating of a switch, stated in voltage and/or current
Contact Smart Card
A smart card that must make contact with the reader. Compare with contactless smart card
Contactless Smart Card
A smart card that uses RFID technology to enable its use without physical contact with the reader. Maximum distance from the reader is either the proximity range (10 cm. / 4 inches) or the vicinity range (one meter / 3 feet) depending upon which of two RFID standards is used
Continuity Measurement
A test performed on a wire or electrical circuit to verify that there are no open lines or poor connections
Continuous Duty
Refers to a device or a control that can operate continuously with no off or rest periods
Continuous Hinge
A hinge designed to be the same length as the moving part to which it is applied as, for example, the lid covering the keyboard of a piano
Continuous Output
The normal voltage available from a power supply
Control
To limit access through electronic and/or mechanical equipment
Control Key
A special key used to remove the core from removable core cylinders and from interchangeable core cylinders
Controlled Cross Keying
Two or more change keys under one master key operating one cylinder
Control Pin
In specific styles removable core or interchangeable core cylinder, a pin that is raised by the control key to the level at which it is flush with the top of the control sleeve. The control pins allow the control key to perform its job of removing the core from its housing
Control Sleeve
The part of removable core or interchangeable core cylinder which surrounds the plug, and which will be operated by the control key
Control Unit
Contains the microprocessor and program memory for an access control system
Convenience Key
Key which can enter into keyway with either edge of blade facing up. Single sided convenience key operates a lock where all the tumblers come from one side and a key could be cut only on one side and still operate the lock. The key is then duplicated on the other side. Double sided convenience key refers to double throw tumblers, which enter the keyway from both directions and require the key to have cuts on both sides. Both sides of the key are cut identical
Conversion Code
See Derived Code
Coordinator
A device used on a pair of doors to ensure that the inactive leaf is per mined to dose before the active leaf. Necessary when an overlapping astragal is present and exit devices, automatic or self-latching bolts are used with closers on both door leaves. See also Door Coordinator
Copy Dog
See Guide
Core
The unit which contains the tumbler springs and the mechanism which locks and unlocks the locking mechanism. Another term for Interchangeable Core
Corner Bracket
A bracket used to mount a door closer on the top side of a door. When the door is opened, the bracket and closer remain in the door opening
Corrugated Key
A key with pressed longitudinal corrugation in its blade to correspond to an irregular shaped keyway
Cotter Pin
A malleable metal pin, whose halves form a cylindrical shape. These halves separate to secure components together
Cover
Lid for a lock case
Cover Plate
1. Cast metal plates designed to cover and protect the locking mechanism on certain styles of locks. 2. A formed metallic plate used to strengthen and cover a damaged door. See also Horn Plate
Cover Screw
A machine thread screw used to attach the cover to a combination lock case
Crash Bar
See Panic Bar or Exit Device
Credential
A medium that contains encoded information, such as ID cards, key fobs, & smart chips
Cremone Bolt
A device of surface application that, by a turn of knob or lever handle, locks the door or the sash into the frame, top and bottom
Cup Escutcheon
A door plate, for use on sliding doors, having a recessed panel to afford finger hold and to contain a flush ring and sometimes a cylinder, all being flush with the surface of the plate
Cross Bore
A hole drilled from side to side of a door. This opening is used to mount the lock
Crosskeying
See Interchange
Crossover Foil
Special foil made of tinned shim brass or mylar tape which is used to foil over wood or metal cross bars on windows
Crow's Foot Mark
On certain combination lock dial rings, an opening index which resembles the letter "Y", with the vertical line extended upward
Cruciform
A style of pin tumbler lock cylinder and key. The face of the keyway is an "X" or circle and there are tumblers on three or four sides of the key. Also known as Cross Keys and Locks
Current
The flow of electricity through a conductor measured in amps
Current Transfer
Products that are designed to carry current to a locking mechanism mounted into a door. There are door cords and electric hinges
Curved Lip Strike
A strike plate whose lip is curved to conform to the detail of the door casing. There are a number of styles of curved lip strikes, including the standard lip, the ANSI preparation strike, the raised lip, and the full lip strike
Customer Key
See Renter's Key
Cut
The indentation in a key made to fit the tumblers in a lock. Any notch or milling made in a key is known as a cut, whether it is angled, square, or curved. Cuts in key blanks are also known as bitting
Cut Depth Number
A short number, usually having only one digit which is used as a shorthand way to represent a cut depth. For example a number 3 cut might stand for 290 thousandths of an inc (0.290)
Cutter
The cylindrical cutting tool used on a key machine to originate or duplicate keys. There are cutters designed for orientation, duplication, and brass and steel key blanks
Cutter Vise
The vise(s) of a key machine that holds the key and/or key blank for th epurpose of originating or duplicating a key
Cutout (door)
A piercing for hardware, lite, louvers, and/or accessories
Cylinder (of a lock)
The cylindrical-shaped assembly containing the tumbler mechanism and the keyway, which can be actuated only by the correct keys
Cylinder Bar
The part of a lock cylinder (such as a rim cylinder or a key-in-knob cylinder) which transmits motion from the plug to the boltwork of the lock. Also known as Connecting Bar
Cylinder Bar Shutter
In a rim lock, a sliding piece of metal designed to cover the hole into which the cylinder bar fits, if the cylinder is pulled out of the door
Cylinder Barrel
See Cylinder Plug
Cylinder Body
See Cylinder Housing
Cylinder Cam
The part of a lock cylinder that transmits motion from the plug to the mechanism of the lock, usually a mortise lock
Cylinder Cap
A threaded part in certain types of locks, which is used to hold the plug within the cylinder body
Cylinder Cap Pin
A long, thin, cylindrical pin which has a narrow section at its tip, and is used to hold the cylinder cap stationary on the end of a pin-tumbler cylinder plug
Cylinder Collar
A plate or ring used under the head of a cylinder. See also Cylinder Ring
Cylinder Drill Jig
A positioning template for drilling through the shear line in cylindrical locks
Cylinder Driver
A circular piece of metal which secures the cylinder bar to the rear of the plug. The shape of the cutout in the cylinder driver varies depending upon application
Cylinder Driver Bar
A cylinder driver and bar built into one unit
Cylinder Guard
A device used to protect the cylinder of a lock, leaving it less vulnerable and more able to resist being drilled or wrenched from the door. In addition, there are cylinder guards that protect the face of the cylinder
Cylinder Housing
The external case of a lock cylinder, which contains the plug, tumblers, and springs. Also known as the shell
Cylinder Key
A key for a lock which has its tumblers contained within a cylindrical enclosure, such as a key for a pin tumbler lock, or a wafer tumbler lock, among other types
Cylinder Lock
A lock in which the locking mechanism is controlled by a cylinder
Cylinder Plug
The movable part of a lock cylinder that contains the key slot or keyway into which the key is to be inserted
Cylinder Puller
A tool for forcibly removing the cylinder from the locking mechanism. There are cylinder pullers for residential/commercial locks and automobile locks
Cylinder Retainer
A part that holds a cylinder in its lock. There are retainer pins and crescent shaped retainers. Some lock cylinders are retained by more than one cylinder retainer. A cylinder retainer can be part of the lock or part of the housing assembly which contains the lock
Cylinder Ring
A circular piece of metal, used to take up the space between the front lip or edge of a lock cylinder and the escutcheon or door in which the cylinder is installed. There are standard length cylinder rings and adjustable cylinder rings. Also known as Cylinder Collars
Cylinder Scalp
A secondary face mounted onto the front of mortise and rim cylinders. The scalp contains the lock manufacturers name. Custom labeled scalps are available
Cylinder Screw
The set screw that holds a cylinder in place by preventing the cylinder from being turned after installation
Cylinder Spindle
See Cam and Driver
Cylinder Spring Retainer
Various shaped metal components which are designed to keep the springs and tumblers within the lock cylinder. There are flat spring retainers which secure all of the tumblers and springs and there are singe retainers which secure the spring and tumblers in only one pin chamber
Cylindrical (locks and latches)
A term used to describe bored locks, which have a cylindrical case into which a separate latch bolt case fits
Cylindrical Lock
1. A lock designed to be installed into round holes drilled in the door. 2. A lockset having the cylinder(s) contained in the knob(s). Also known as a bored lock, a key-in-knob lock and cylindrical dead bolt locks
Cylindrical Lock Prep
Cutout (or hole) in a door for bored/cylindrical locksets. Also known as 161 Prep
Data0 (D0)
One of two data lines in Wiegand communications. Data0 (D0) represents the binary "0"
Data1 (D1)
One of two data lines in Wiegand communications. Data1 (D1) represents the binary "1"
Day-Night Control
A control instrument which can be wired with two protective circuits. The day circuit is on 24 hours a day; the night circuit is only on when the premises are closed
dB
Abbreviation for Decibel
DCDB
Abbreviation for "Door Cut Down Bottom" - Cut door undercut
Dead Bolt
A lock component which projects from, and is withdrawn into, the lock case by action of the lock mechanism. When the door is closed and the dead bolt thrown, it extends into the strike, locks the door, and does not release with end pressure
Dead Bolt Lock
A single or double cylinder lock whose bolt mechanism becomes locked against end pressure when projected. There are a variety of styles and grades of dead bolt locks
Dead Latch
Aluminum narrow stile door locking mechanism that operates using a spring loaded latch
Deadlock
A lock equipped with a dead bolt only
Dead Locking Latch
1. A type of latch which, once it has been extended into its strike plate on the door frame, resists any attempt to push it back by end pressure or by shimming. 2. A type of lock that has such a latch as one of its working parts. Also known as a Dead Latch
Dead Locking Padlock
A padlock that must have the shackle in the locked position befroe the key can be removed. This type of padlock can never be left unlocked without leaving the key in it
Deadlocking Plunger
The plunger on a deadlocking latch that stops against the face of the strike. Positioned in this location, the latch can not be retracted by foce
Dead Pin
A small diameter metal rod mounted onto the face of the inner bushing in a position which restricts the entry of a standard tubular key or pick
Dead Trap
A trap in which the trap wire carries no current
De-Burring Tool
A bladed tool designed to remove burrs from cylinder pins and pin chambers
Decibel (db)
An increment of measurement used to compare measured levels of sound energy (intensity) to the apparent level detected by the human ear. A sound that has 10 times the energy of another sound is said to be 10 decibels louder; 100 times the energy is 20 decibels louder; 1,000 times the energy is 30 decibels louder and so on. Decibel levels are correctly expressed as the number of decibels at a measured distance from the source of sound (for example, 125dB at 10 feet)
Decode
1. To determine the depths of cut in a key. 2. To determine the tumbler depths in a lock in order to originate a key
Deep Master Key
A type of master key that has none of its cuts made shallower than the corresponding cut of the individual keys. This type of master key should not be used, because any individual key in the system can be cut down in order to make such a master key
Delay Exit Control
Controls the amount of time for the door release delay while at the same time the door will be released immediately for an emergency or power failure
Delay On Break
A term used to describe a mode of operation relative to timing devices. The delay begins when the initiate switch is opened (delay on break of initiate switch)
Delayed Action
An optional feature for door closers that permit the door to swing more slowly from fully open to just prior to the sweep range. This enables slower moving individuals (i.e. handicapped and equipment movers) to get safely through the door
Delayed Egress
An irreversible time delay built in the locking device of an opening preventing immediate egress
Deposit Safe
A safe with a slot or hopper into which money can be inserted
Depth Key
1. One of a set of lever-tumbler keys which has a flat surface of constant depth all the way along its length. It is used together with a spacing key, in order to make a lever tumbler key by number. 2. See Guide Key
Depth Gauge
A device to determine the depths of cut in a key. Depth gauges are commonly produced by lock manufacturers for their own key depths
Depth of a Cut
The amount of metal remaining on a key in a given cut position. This is measured from the root of the cut to the bottom of the key blade
Depth of Security
Concentric perimeters of security having different or increasingly stringent access methods. An inner area is protected both by its own access methods and by those of the areas that enclose it and must therefore be entered first
Derived Code
A series of code numbers which is derived from another series of such code numbers, by performing some mathematical operation, such as adding or subtracting a constant number. Also known as a Conversion Code
Detection Area
The area in which a detector can accurately measure disturbances. This area is determined by walls, doors, and other obstructions
Detection Pattern
The shape of the detectors sensing capability. The pattern is different for passive and active sensors, as well as differences within each
Detector / Sensor (Motion)
A device designed to detect the movement of a person or object in the vicinity of the doorway and signal the door control. Four types are in use today. They are: Infrared (Active) - A device that emits infrared energy and detects the amount reflected from people. The pattern can vary in size from narrow to wide, depending on design. Infrared (Passive) - A device designed to detect a change in temperature gradient. These devices do not emit any energy, but only detect infrared energy differentials. Microwave Unit - A device that operates on the Doppler radar principle, designed to detect moving people. Microwave units use antennae designed for varying pickup patterns usually described as either wide or narrow. Microwave units are normally either the directional or non-directional type. Visual Image Processing - A device that uses camera (s) along with digital signal processing to detect motion of people within the defined zone of the camera’s field of view
Detector / Sensor (Presence)
A device designed to detect the presence of people in the vicinity of the doorway and send an activating signal to the door control. Four common types are in use today. They are: Holding Beam - An infrared device used to activate, re-activate, or hold open a sliding door. It is used as a safety device to hold the door open. There are two types on the market. One uses a separate transmitter and receiver, the other uses a transmitter/receiver in one unit with a reflector. Both types use pulsed infrared as the detecting medium. Infrared (Active) - A device that emits infrared and detects the amount reflected from people. The pattern can vary in size from narrow to wide, depending on design. For sensors that are capable of learning different environments, the standard establishes a 30 second minimum learning time. Ultrasonic - A device that uses a transducer or transducers to emit high frequency sound to detect the presence of a person through echolocation. The pattern from a transducer is narrow and precise in range and transducers can be combined to produce a larger detection area. Visual Image Processing - A device that uses camera(s) along with digital signal processing to detect presence of people within the defined zone of the cameras field of view
Detent Lever
A lever that can be disengaged and displaced by the rotation of a change key. Detent lever disengagement permits the lift radius of its companion sweep lever to adjust to a cut in a set-up or renter's key
Deterrent
Anything that discourages an unauthorized entry. An alarm system or a dead bolt are considered good deterrents
Dial
A numerically calibrated part used to control the position of the wheels of the combination lock and operate the bolt when alignment is attained
Dial & Ring (Spy-Proof)
Transparent dial and ring permits inspection of vital areas and restricts unauthorized observation
Dialer
1. A device for transmitting alarm signals over telephone lines using a communicator that sends a message to a receiver. The receiver is usually a central station. 2. A tool that will automatically dial all combinations in order to unlock a safe. The dialer tool is designed to be mounted onto the combination lock dial. Once programmed, it will dial any or all combinations
Dial Read Out Micrometer Key Machine
A type of micrometer key machine which displays the measurements of depth and spacing as divisions on a set of dials. See also Micrometer Key Machine
Dial Ring
The part directly around the dial and on which is located the opening, changing and L.O.B.C. indices. L.O.B.C. is an abbreviation for "Locked On By Combination"
Dial Ring Bearing
A specialized plastic component which mounts into the center of specific models of dial rings and acts as a bearing surface for the dial and spindle. This bearing is made of plastic in order not to conduct electricity, making it impossible to decode the lock using electricity
Dial Shield
A housing used to shield the combination lock dial from unauthorized observation
Dial Spindle
In a combination lock, a threaded metal rod that is usually attached at one end to the combination dial, and the other end screws into the drive cam
Die
A tool used for the cutting of threads on an external surface
Die Cast
Formed by casting of molten metal in a permanent die
Digital Keypad
An electronic input device with a varying number of keys
Digital Lock
A lock which uses a series of numbered and/or letter push buttons for opening. A digital lock can be mechanically or electronically operated
Dimple Key Machine
A key machine designed to duplicate high security keys which have drilled indent cuts in the sides and/or edges. Also known as a Multi-Point Machine and a Drill Style Key Machine
Diode
An electronic component that will only pass current in one direction. Commonly used in door controls for rectifying AC to DC
Dip Switch
A small type of gang switch used on circuit boards for mode selection. Acronym for a switch that mounts in the same socket of circuit pattern as a Dual-In-Line I.C. that are normally called dual-in-line packages; hence D.I.P.
Direct Current
A current that flows in one direction only and constant magnitude for a given load. Direct Current flows when the polarity remains constant with time. Direct current is supplied extensively in electronics and low power applications. Direct current can be obtained from DC power supplies or by adding a silicon rectifier to an AC current. Direct current is measured in amperes; "I" or "A"
Direct Digit Code
A type of code in which the digits are the cut numbers of the key. This type of code number may be read from bow to tip, or from tip to bow, depending on the make of the lock. Direct digit codes can be stamped into keys, tail pieces and lock housings
Disarm
To turn off an alarm system
Disc Tumbler
The disc tumbler is a double acting, spring loaded flat plate designed to slide in slots which run through the diameter of the cylinder plug. See wafer plug
Display Key
A key used in a hotel lock system, which will open and lock one particular guest room from the outside. This key prevents all other keys from operating the lock. The only key that can unlock this room is an Emergency Key
Dogging
1. To lock the exit devices in the unlocked position, so that the door can be opened from either direction. 2. See Dogging Key and Locking Dog
Dogging Device
As used in exit devices, a mechanism that fastens the cross bar in the fully depressed position, and also retains the latch bolt or bolts in a retracted position, thus permitting free operation of the door from either side. See also Dogging Key
Dogging Key
A special key that is used to hold down the bar of a panic exit lock. The purpose of the dogging key is to keep the panic exit device in the unlocked position. This is normally done during business hours and save wear and tear on the panic device. This key is often in the form of a hexagonal rod with a triangular or round head. Also known as a Dogging Device
Door
A movable panel or leaf used to close an entryway
Door Bolt
A manually operated rod or bar attached to a door providing means of locking
Door Chain
See Door Guards
Door Check
See Door Closer
Door Closer
A device used to control the action of a door by use of either hydraulic pressure, high tension spring, electrical devices, or air pressure. Single acting door closers operate doors which swing in one direction from frame to open and back to frame. Double acting door closers operate doors which swing in both directions, the closing point is the frame. A positive centering door closer is a double acting door closer which is specifically designed to stop at the dead center of the door frame every time. Also known as a Door Check
Door Closer Arm
On conventional door closers, the arm is the connection between the door and the closer or the jamb and the closer
Door Closer Bracket
A device whereby a door closer may be installed on the frame rather than directly on the door
Door Closer or Check
A device combining a spring for dosing and a compression chamber into which the liquid or air escapes slowly, thus providing a means of controlling the speed of the dosing action
Door Contact
A means of detecting whether a door is open or closed. Notifies when the door is held open or entry is forced
Door Coordinator
A piece of hardware that is used on a pair of doors, in order to hold the active door open until after the inactive door closes
Door Cord
A surface mounted, flexible cord containing wires used to carry current to and from contacts mounted on doors and some movable windows. Door cords can be used in place of electric hinges and pivots. Also known as Door Loops and Flexible Conduits
Door Edge Pin
A pin installed into the hinge edge of an outswing door. This pin secures the door even if the pins are removed from the hinges. Also known as an Anti-Liftout Pin
Door Edge Shield
A piece of metal with a U-shaped cross section, that is wrapped around the edge of a door to protect the area of the door in which the lock and latch are installed. Also known as a Door Plate
Door Filler Plate
Metal plates designed to convert a door edge opening to a different application. Door filler plates are used to convert larger openings to accommodate smaller lock applications
Door Guards
Secondary door locking mechanism which permits the door to open slightly. There are two styles of door guards; chain and hinged bar. Also known as a Door Chain
Door Hardware
Components whose primary application is to be mounted on a door. These components mare or may not contact the door frame
Door Holder
A device that holds a door open at selected positions
Door Lock
1. Locks designed to secure a door. There are a variety of door locks including key-in-knob, dead bolt, and mortise locks. 2. Locks designed to secure a cabinet door
Door Loop
See Door Cord
Door Mounted Sensors
Sensors mounted on the door leaf such that they move with the door
Door Pivot
A hinging device embodying a fixed pin and a single joint. Most types include lateral fastening
Door Plate
Metallic plates which wrap around the edge of the door that contains the lock and or locking mechanisms. There are a variety of styles and sizes of door plates. See also Door Edge Shield
Door Position Indicator
A switch mounted into the frame of the door which signals the position of the door; ajar or closed
Door Pull
A handle mounted onto the door used to open the door. Door pulls are available in a variety of shapes and sizes
Door Release
An electronic mechanism which automatically releases the open door permitting it to close when smoke is detected. See Electromagnetic Door Holder
Door Stop
A device to stop the swing or movement of a door at a certain point. Also an architectural term defining that part of a door frame against which the door closes
Door Sweep
A weather brush or stripping used on the bottom of a door panel
Door Switch
A switch mechanism which activates and deactivates when the door is opened and closed
Door Thickness
1. The dimension of a door measured from side to side along one edge. 2. The measurement of a safe door from the lock mounting surface on the inside to the exterior face of the door
Doorway Viewer
A device that is mounted in a door, and enables a person on the inside of the door to view the area outside the door
Double Acting
1. Door or door closer which is designed to operate in both directions. 2. A wafer or disc tumbler is double acting. Moving in one direction from spring pressure, moving in the opposite direction when the key is inserted into the lock
Double Acting Operator
An operator that is powered when moving in one direction and is capable of moving manually in the other direction in emergency situations
Double Bitted Key
A key having cuts on both sides of the blade to active the tumblers of a lock
Double Bitted Lock
A wafer lock in which the tumblers are spring loaded from opposite directions
Double Circuit
A lacing, screening or foiling arrangement in which two adjacent patterns are installed; one pattern in the positive leg, the other into the negative leg or the protective circuit
Double Custody Lock
One that can only be unlocked when two different keys (usually possessed by two different persons) are inserted in sequence. Either key cannot open the lock alone
Double Cylinder Lock
A type of lock which has two cylindres (one on the inside of the door, and the other on the outside) to activate its locking mechanism. There are double cylinder key-in-knob locks, mortise locks, and dead bolt locks
Double Doors
A pair of doors that meet in the middle of the door frame when closed
Double Horn Safe Deposit Box
See Double Nose Safe Deposit Box Lock
Double Nose Safe Deposit Box Lock
A type of safe deposit box lock that has two extended copmonenets into which the key is inserted. The guard key enters one nose, and the renter's key enters the other nose. Also known as Double Horn Safe Deposit Box Lock
Double Pole/Double Throw
A term used to describe a switch or relay output contact form (2 form C) in which two separate switches are operating simultaneously, each with a normally open and normally closed contact and a common connection. This form is used to make and break two separate circuits. Abbreviation is DPDT
Double Sided Key Machine
A key machine designed to cut both sides of a double sided key at the same time
Double Throw
This refers to the ability of a switch or relay to direct current through more than one path. Double throw switches may be used on single or multiple pole switches
Double Throw Lock
One with a bolt which after the first throw can be extended further by an extra turn of the key or thumb turn. This type of lock mechanism requires two turns to withdraw the bolt when so locked
Double-Throw Bolt
A bolt that can be projected beyond its first position into a second, or fully extended one, thus providing extra security
Dove Tail Pin Tumbler
See Interlocking Pin Tumbler
Down-Hill Combination
A combination of cuts on a key in which the cuts become deeper and deeper from the bow to the tip. The use of such a key should be avoided, because it may become possible to pull the key out of the plug in positions other than the proper one or ones
DPDT
Abbreviation for Double Pole Double Throw
Drawer Roller
A device used to ease the sliding of a drawer open or shut, usually with a metal or fiber wheel rotating in a metal frame
Drawer Slides
A mechanism employing guides and rollers that guide and support the drawer, permitting easy operation
Drill Gauge
A measuring plate with a number of different sized holes which are used to indicate the diameter of a drill bit
Drill Pin
A round pin extending from the interior side of a lock case opposite the key hole to accept a barrel key
Drill Resistance
The ability of a lock to resist unlocking when attacked with a drill
Drilled Key
See Barrel Key
Drive Cam
A circular safe combination lock component which transfers motion to the wheels and is gated to retract the bolt
Drive-In Latch
A latch with a cylindrical knurled ring around the face that will grip in the edge bore of a door when installed. Most common use of a drive-in latch is a metal door
Drive Pin
In a combination lock, the shaft extending from the underside of the drive cam and from all wheels but the most distant wheel. The drive pin is used to transfer motion from the drive cam is through the wheel pack
Driver
1. The upper pin in a pin tumbler lock. This pin obstructs the shear line when no key is inserted into the keyway. A driver is usually chamfered or flat on both ends. There are some locking systems which use varying length drivers to compensate for the different length bottom pins. 2. Metal part used to mount the cylinder bar onto the rear of a Schlage pin tumbler cylinder. The driver and cylinder bar are secured onto the rear of the plug using a cylinder cap. Drivers vary depending upon lock type and application. Also known as Top Pin
Driver and Cylinder Bar
These two components are mounted onto the rear of certain styles of pin tumbler cylinders. The driver and cylinder bar are secured onto the rear of the plug using a cylinder cap
Driver Pin Spacer
A thin spacer formed to serve as a drive pin
Drivers
The upper set of pins in a pin tumbler cylinder, which, activated by the springs, project into the plug until raised by insertion of the key
Drop Escutcheon
One having a pivoted plate that covers the key hole
Drop-In-Point
The number on a safe dial that lines up with the opening index when the fence falls into the slot in the drive cam
Drop Plate Bracket
A bracket used when the top rai of a door is too narrow to mount a door closer
Drop Relay
The relay used to latch the bell circuit (keep the bell or warning signal ringing)
Drop Ring
A ring handle attached to a spindle that operates a lock or latch. The ring is pivoted but remains in a dropped position when not in use
Dry Cell
A non-rechargeable type of battery
Dry Contact
Metallic points making (shorting) or breaking (opening) a circuit
Drywall Frame
A three piece door frame, installed after a wall has been erected
Dual
Two swinging doors, side by side, in a common header, that operate independently of each other and are separated by a vertical member
Dummy Cylinder
A mock cylinder without any operating mechanism for use where effect is desired
Dummy Knob
A knob, free or stationary, that only as trim hardware for the inactive door in a double door entry
Dummy Lever
A lever, free or stationary, that only as trim hardware for the inactive door in a double door entry
Dummy Trim
Trim only, without lock; usually used on the inactive door in a pair of doors
Duplicate Key
A key which is cut from the pattern of another
Dustbox
A rear cover for the inside of a strike plate. This finish component keeps wood and other building materials from passing back through the strike opening. Also known as a Strike Box
Dust Cover
1. A clear plastic shield used to keep fingerprints off the dial and dial ring of a combination lock. A dust cover is required on all G.S.A approved security containers. 2. An external cap used on some cam locks whose application is in adverse climate conditions
Dust-Proof Strike
A strike with a spring plunger that completely fills the bolt hole when the bolt is not projected
Dust-Resistant Cylinder
A cylinder, usually automotive or marine application which has a mechanism of spring-loaded shutters in or in front of the key slot. This is designed to prevent dust and dirt from damaging the internal parts of the cylinder
Dutch Door
A door having two separate leaves, hung one above the other. Also known as a Hollywood Door
Dutch Door Bolt
Device for locking together the upper and the lower leaves of a Dutch door
Edge Bore
A hole drilled into the edge of a door in order to install the latch and/or bolt mechanism of a cylindrical lock
Edge Plate
An angle or channel-shaped guard used to protect the edge of a door
Edge Pull
A pull mortised into the edge of a sliding door
Effective Plug Diameter
Dimension determined by adding the theoretical root depth of the key cut plus the factor length of the bottom pin. This length may or may not be the same as the actual plug diameter
Egress
Free access outside from inside
Ejector Punch
A narrow punch designed to remove the individual chamber capping pins from certain models of interchangeable cores
Elbow Catch
A spring-loaded device embodying a rocker arm and angle strike, for locking the inactive leaf of a pair of cabinet locks
Electrical Card Lock
A type of card-operated lock that depends upon electricity to function
Electric Eye
The light sensitive device used in photoelectric systems
Electric Latch Release
See Electric Strike
Electric Lock
A bolt or bar type locking mechanism that is only activated by electric current. An electric lock does not have a knob, thumb turn, or keyed cylinder
Electric Pick Gun
Battery operated picking instrument designed to vibrate all of the tumblers in a lock at the same time. This permits the tension tool to rotate the plug
Electric Strike
An electric door locking device (usually solenoid-operated) that will unlock the door when electrical power is applied to it. A fail-safe configuration will operate in the reverse condition (i.e., normally locked when power is applied and unlocked when power is interrupted). Previously known as an electric door opener
Electrified Lock
A type of lock that has been modified to be activated by an electric current. An electrified lock can also be operated as a mechanical lock
Electromagnet
A coil of wire, usually wound on an iron core, that produces a strong magnetic field when current is sent through the coil
Electromagnetic Door Holder
Holds doors open using electromagnetic energy as part of a fire/security system. Door are released during an emergency
Electromagnetic Latch Release
A device used in conjunction with a vertical rod exit device on an automatic swinging door to coordinate the automatic door operator with the exit devices. Typically used on fire door applications
Encryption
The reversible transformation of data from its original form to a format which is difficult to interpret. This is a mechanism to protect the confidentiality and integrity of the data and insure integrity. Encryption requires use of an algorithm and one or more encryption keys
End of Line Resistor (EOL)
Resistance in a supervised circuit, usually at the farthest point from the alarm control unit, restricting the flow of current to a known value which is monitored. Shorting the circuit in an attempt to bypass protective devices in the loop (i.e., door contacts) will create increased flow of current and cause an alarm. Opening (breaking) the circuit also triggers an alarm if the system is armed, or a supervisory signal, if the system is disarmed
Entry/Entrance/Office Function
Push button locking. Button on inside locks outside lever until unlocked by key or by rotating the inside lever. Inside lever always free
Electronic Lock
A lock primarily designed to operate electronically from the hand-set,/p>
Emergency Cam
In certain mortise type hotel or motel function lock, a cylinder cam that is able to be rotated only by the emergency master key
Emergency Exit Alarm Lock
See Exit Alarm Lock
Emergency Key
1. A shaped stamped metal key used on privacy type locks for emergency entrance. 2. A key used in specific applications, i.e. hotels, which can be used to open doors locked from the inside and/or can be used to lock out all other keys
Entrance Handle
An entry lock that uses a handle on the exterior side to push and pull the door. The lock cylinder is usually mortised into the door
End of Line Resistor
A resistor installed at the termination point of a monitoring circuit. Used to determine if wire has been cut
Engineer's Key
Single key that acts the same as a grand or great grand master key. This key permits entrance into rooms that contain the electrical, heating, maintenance, etc. This special key must be set up at the inception of the system
Entrapment Ball Bearing
In an entrapment cylinder, a piece of metal int he form of a sphere, having a very rough surface finish, and used for the purpose of trapping an unauthorized key by exerting a frictional force, which makes the key extremely difficult to remove
Entrapment Cylinder
A pin-tumbler cylinder that contains a device designed to trap and hold any unauthorized key that is inserted into the key slot
Entrapment Override Shim
A thin, flat piece of metal which, when inserted into the key slot of an entrapment cylinder alongside a trapped key, can be used to remove the key from the slot
Entry Control
Equipment specifically designed to control access through specific doors or gates. The equipment includes metal detectors, security intercoms, telephone entry systems, and video entry system
Equipment Locks
Specialized locks for securing equipment including tool boxes and power tools
Error Rate
Amount of mistakes when an access control system provides access to an unauthorized person or denies access to an authorized person,/p>
Escutcheon (Elongated)
A plate long enough to span a lock case and having holes for knob bushing, bit key, cylinder, turn knob and similar operating members as required,/p>
Escutcheon (Key)
See Key Plate
Existing Wall Anchor
An expansion bolt sleeve anchor, used to anchor a frame in an existing block wall. A reinforcement bracket and a punch-out & dimple prep through the stop of the frame is required for the sleeve anchor to go through
Exit Alarm Lock
A type of lock which can be opened from the inside of the door without a key in an emergency situation, and which sounds an alarm when this is done
Exit Device
A door-locking device designed to grant instant exit by pressing on a cross bar that releases the locking bolt or latch
Exit Latch
A paddle handle exit device. Pressing down on the paddle handle releases the locking mechanism
Expanding Plug Follower
A type of plug follower that expands in diameter to follow large plugs, and can be compressed to follow smaller plugs
Extended Bypass
The alarm sounds if the door switch (or bar switch) is opened in the armed condition. The key is required to reset the alarm. If the door switch is open, turning the key on, the unit will flash the red light twice. Once the door switch is closed, the unit will go through the arming delay mode and arm
Extended Lip Strike
A strike plate with a longer than usual lip. An extended lip strike is designed to be used on center hung doors and doors which will benefit from the longer strike lip
Extension Flush Bolt
A flush bolt in which the connection between bolt head and operating mechanism is by means of a rod inserted through a hole bored in the thickness of the door
Extension Link
A device used to provide long backsets in bored locks
External Relocking Device
A relocking device that is built outside the case of a combination lock (or key-operated lock). Often, such a device is built into the door of a safe
External Set Screw
In a mortise lock, a set screw that is accessed from the edge of the door, and which is used to hold the cylinder in the lock
Extractor Key
Used with construction master keying to remove the inserts from the keyway of each cylinder. There are pin tumbler and wafer tumbler cylinder extractor keys
Extra Duty Arm
A door closer arm option which is made of steel to handle the extra abuse
Face (of a lock)
The exposed surface that shows in the edge of a door after installation (See Front)
Face Plate
1. The part of a lock through which the latch and/or bolt protrudes and by which the lock is fastened to the door. 2. The plate through which the latch and/or bolt extends from the door
Facial Geometry
One of the physical traits that can be measured by biometric technology - the relative position of eyes, nose, and mouth on the face
Fail Latched
A locking device which activates at the loss of power. Latch mechanism controls door but does not necessarily restrict movement from secured side
Fail Safe
A term used to describe an electric lock that has a mechanical state of being unlocked and requires power to lock it. Also known as electrically locked. Detex abbreviation: FSA
Fail Secure
A term used to describe an electric lock that has a mechanical state of being locked and requires power to unlock it. Also known as electrically unlocked. Detex abbreviation: FSE
False Acceptance
In biometric identification, the erroneous result of identifying someone who isn’t in the database of known people. It is one of two ways biometric identification can fail; the other is false rejection
False Back Plate
A type of back plate that extends just slightly beyond the edge of the hole in which a rim cylinder is installed and is much smaller in area than the back of the case of the rim lock with which it is used
False Gate
1. In a lock tumbler a partially cut-out section, that is intended to make it more difficult to pick or to impression the lock. 2. A half deep gate in a combination lock which is intended to make it more difficult to manipulate the lock
False Rejection
In biometric identification, the erroneous result of failure to recognize a known person. It is one of two ways biometric identification can fail; the other is false acceptance
FAR
False Acceptance Rate. For a biometric device, the percentage of readings that are a false acceptance
Fast Pin Hinge
One in which the pin is fastened permanently in place
FCDB
Abbreviation for "Frame Cut Down Bottom" - Cut jamb legs down in height
Feather Spring
A spring made of a flat strip bent approximately to a "V" to fit over a stamp in the lock case
Fence
The component on the lock bolting mechanism that enters the lever gates when they are properly aligned. Obsolete terminology is "the Stump"
Fiber Optic Transmission Systems
Multimode or single mode fibers designed to transmit signals using modulated light
Field Reversible
Handed locking products are considered field reversible if the arrangement of their parts can be changed to permit operation on a door which opens differently
File
A hardened steel tool with cutting ridges to form, smooth, or reduce the surface. There are several styles of files including round, pippin, and flat
File Cabinet Lock
A plunger style lock which is designed to secure the drawers of a file cabinet. There are round and square bolt types of file cabinet locks
File Card
A cleaning brush for files and key machine cutters
File Cutter
A style of duplicating key machine cutting wheel which produces a fine cut in soft metal key blanks
File Drawer Bar Lock
An after market locking bar mechanism designed to secure file cabinet drawers
Filler Plate
A blank plate used to fill mortised cutouts
Finger
Steel rod extending from the tubular pick which contacts and pushes against the bottom pins
Finish
The base metal, final coating and/or color on a lock, safe or door hardware. Lock and door hardware manufacturers comply with specific color standards
Finish Builders Hardware
Hardware that has a finished appearance as well as a functional purpose and that may be considered a part of the decorative treatment of a room or building. Also termed Architectural Hardware, Finish Hardware and Builders Finish Hardware
FIPS
Federal information processing standard
FIPS201
Federal information processing standard for personal identification verification (PIV)
Fire Exit Bolt
See Exit Device
Fire Exit Hardware
Panic hardware which additionally provides fire protection when used as part of a fire door assembly and is labeled by a NRTL and is subject to follow-up inspection service
Fire Lite
A type of ceramic glass used in fire rated doors and frames
Fire Rated Door or Frame
The ability of a door or frames to provide an effective barrier against the passage of flames, smoke and toxic gases and/or to reduce the transmittance of radiated heat
First Key
A key originated from a key blank to fit a lock, without using a functioning key as a guide
Fixed Cam
A cam that fits tightly against the lock's plug. The cam, nor the plug, can rotate without first retracting the tumblers across the shear line. Also known as Rigid Cam
Flag Type Vertical Bolt Lock
A rim vertical bolt lock that has a readily-visible indicator to show whether the bolt is locked or unlocked
Flat Key
A key, usually stamped from flat material without grooves or millings. Also known as Flat Steel Key
Flat Slotter
Flat cutter designed to make depth cuts only. Flat slotters are available in a variety of thicknesses
Flat Steel Key
See Flat Key
Flip Lock
A door locking mechanism made up of two interconnecting metal plates. One plate is mounted into the door frame
Floor Anchor
See also base anchor
Floor Closer
A closing device installed in the floor under a door
Floor Hinge
A combined pivot hinge and closing device set either in the floor or in the bottom of the door. It may be spring type only or may be combined with liquid control
Flush Bolt
A door bolt so designed that when applied it is flush with the face or edge of the door. Door bolts are placed on the inactive door of a double door application
Flush Cup Pull
A pull mortised flush into a door, having a ring pull that folds Hat into the cup of the pull
Flush Door
A door without glass and/or louvers
Flush Ring
A flush door pull mortised in a door, having a ring pull that folds flat into the cup of the pull
Fluted-Head Screw
A type of screw that has a set of flutes or grooves around the rim of its head, parallel to the length of the screw
Fly
The part which makes contact with the drive pin for rotation of the wheels in a combination lock
Foil
Thin ribbon-like conductor placed on glass and hollow doors and connected into the protective circuit of an alarm system
Foil Protector
A special varnish used to coat foil to protect it from damage
Folding Door Lock
A lock which secures folding doors from sliding open
Follow Tool
A special tool used when removing a plug from the cylinder housing to simultaneously retain the spring loaded driver pins. It is usually a cylindrical straight smooth rod having a diameter similar to the plug. Follow tools are made of metal, wood and plastic
Foot Bolt
A type of bolt applied at the bottom of a door and arranged for foot operation. Generally the bolt head is held up by a spring when the door is unbolted
Force Gauge
A test device used to measure door opening and closing force
Fork Bolt
Latching mechanism used on some model compartment locks
Form C Relay
A switch mechanism which contains three terminal points: Open, Closed, Common
Format
The way that the information (parity bits, facility code and card #) is organized on the credential
Frame Filler Plate
Metal plate designed to convert a frame opening to a different application
Frame Hardware
Components whose primary mount is onto the door frame. These components may connect with the door and/or affect the doors operation
Frangible Shackle Padlock
See Breakaway Padlock
Free-Spinning Cylinder Ring
A cylinder ring that, if turned by a wrench, would rotate without moving the cylinder
French Door
A wooden framed door containing a full length glass panel. This type of door usually requires a shorter backset lock and offers almost no security
Friction Catch
Any catch which when it engages a strike is held in the engaged position by friction. See also Ball Catch
Friction Hinge
A hinge designed to hang a door and hold it at any desired degree of opening by means of friction control incorporated in the knuckle of the hinge
Front (of a lock)
The plate through which the latching or locking bolts project (See Face)
FRR
False Rejection Rate. For a biometric device, the percentage of readings that are a false rejection
FSA
A term used to describe an electric lock that has a mechanical state of being unlocked and requires power to lock it. Also known as electrically locked. See also Fail Safe
FSE
A term used to describe an electric lock that has a mechanical state of being locked and requires power to unlock it. Also known as electrically unlocked. See also Fail Secure
Full Access Key
In a certain type of entrapment lock system, a key which will operate the lock at all times, whether the limited access key is programmed to work or not
Full Glass Door (Design FG)
A design of dor having louvers the entire height and width of the area surrounded by rails and stiles
Full Louver Door (Design FL)
A design of door having louvers the entire height and width of the area surrounded by rails and stiles
Full-Size Back Plate
A type of back plate that extends far beyond the edge of the hole in which a rim cylinder is installed, and is very nearly equal in surface area to the back of the rim lock case with which it is used. This type of back plate provides improved security against forced entry accomplished by pulling of the cylinder. See False Back Plate
Full Ward Ring
A ward ring that prevents rotation of its cylinder plug in either direction (clockwise or counter-clockwise), unless a notch is cut in the bottom of the key to clear this ward ring
Full Wave Bridge Rectifier
Electrical component which converts AC to DC. A full wave bridge rectifier is used on fail safe electric strikes, which lock when solenoid is energized. Also known as a bridge rectifier or a rectifier
Function
1. The application of a lock, i.e. storeroom, entry, etc. 2. The electrical operation of locking and unlocking doors by means of a remote control
Fusible Link
A piece of soft metal designed to melt at low temperatures during a fire or from a surge of electricity. Fusible links are used on electrical components to prevent circuit overloading
Fusible Link Hold Open
A type of friction hold open in a door closer which will force an open door to close when the fusible link is melted during a fire
Fusible Link Louver
A louver used in fire-rated doors
Gasket
A rubberized spacer used to weatherproof an outside electrical box and cover
Gate
The cutout in the circumference of a combination lock wheel which is engaged by the fence on the lever assembly
Gate Box
A metal box designed to contain entry and/or dead bolt locks to secure a metal gate or door. Most gate boxes are welded in place to provide the maximum security
Gate Cover
A plate which prevents the lever from entering the gates of zero change combination locks while the combination is being changed. A second function of the gate cover is to prevent insertion of the change key until the wheels are properly aligned
Gate Dead Bolt Lock
A single or double cylinder lock which uses a dead locking latch bolt. The gate dead bolt lock is used on some styles of swinging gate locks
Gate Lock
A lock and locking mechanism designed for swinging or sliding gates
Gateway
A device for providing isolation and control of the flow of information between a computer and authenticated devices on the network
Gauge
Wire size: higher gauge means thinner wire
Gear-Drive Combination Lock
A type of combination lock in which the motion is transmitted from the dial to the drive cam by a system of meshing gears
Gel Cell
A battery which uses gelled electrolyte rather than liquid electrolyte
Generation Key Cutting
Duplicating a key from a duplicate key. Generation cut keys are easily distinguishable because the cuts are rounded off, no longer sharp like an original key. The rounding off is the result of use and repeated duplications
Give-Away Ring
Inexpensive wire key rings given away by locksmiths when two or more keys are purchased
Glass Stop
Extrusions used to hold the glass in a door leaf
Glazing Bead
Removable trim at a glazed opening to hold glass securely in place
Goof Rings
Adapter rings for a cylindrical lock used when the cross bore opening is either too large or the hole has been drilled incorrectly. The most common application of a goof ring is to reduce the cross bore opening from 2-1/8" to 1-1/2" diameter. A Scar Plate can be used in place of a Goof Ring
Grand Master Key
A key that operates locks in several groups, each of which has its own master key
Grand Master Key Section Blank
A type of key blank that is designed to enter two or more groups of different key slots of keyways, where each group has its own master key section blank, and where each key slot has its own individual key section blank
Graphite
A very soft form of the element carbon, which has been used by some locksmiths to lubricate lock parts. The use of graphite has been basically replaced by silicon based and other products for lubricating lock parts and mechanisms
Graphite Pin
In a certain type of construction master key system a pin tumbler which is made of a soft form of carbon
Graphite Pin Construction Master Key System
A type of construction master key system in which a pin tumbler made of graphite is used, so that this pin can easily be broken, to void the construction master
Gravity-Drop Combination Lock
A type of combination lock that depends on the force of gravity to enable the fence to enter the gates of its combination wheels
Great Grand Master Key
A key designed to operate all of the locks that are within the domains of two or more grand master keys
Great Grand Master Key Section Blank
A type of key blank which is designed to enter all of the key slots that are within the domains of two or more grand master key section blanks
Great Grand Master Key System
A great grand master key with two or more grand master key systems set up under this great grand master key
Great Great Grand Master Key
A key that is designed to operate all of the locks that are within the domains of two or more great grand master keys
Great Great Great Grand Master Key
A key that is designed to operate all of the locks that are within the domains of two or more great great grand master keys
Grip Handle
Style of entry lock that has a handle
Grommet
A flexible loop, such as a ring made of rubber
Grommeted Padlock
A padlock that has a grommet around its case or body, to protect the finish of the door on which it is installed, and to decrease the noise created when the padlock strikes the door
Grooves
1. Milled-out areas or the blade or bit of a key. 2. Broached-out or hollow areas in the keyway of a lock
Ground Wire
An electrical conductor that leads from a device to an earth ground connection
Group
Part of terminology to indicate the different classifications for combination locks
Guard Bar
A series of two or more cross bars generally fastened to a common back plate to ensure protection of glass or screen in a door
Guard Key
The key retained by the bank which preps a series of locks in the fault. A renter's key will not work unless the guard key is used. Also known as a Preparatory Key
Guard Lever Pack
Set of levers used in a safe deposit box lock which are operated using the guard key
Guest Room Key
A single key that operates the lock in an individual room only
Guide
The parts of a duplicating key machine which follows the cuts in a pattern key or template. Also known as a Stylus or Copy Dog
Guide Lines
Chalk lines on glass which outline the foil pattern
Half-Moon Plates
See Anti-Drill Lunes
Half-Mortise Lock
A type of lock which requires partial removal of the material on which it is installed, as in the case of many desk drawer locks
Half Glass Door (Design G)
A design of door having class in upper portion only
Halogen-Type Otoscope
A viewing instrument which has an extremely bright source. The otoscope is designed to view the interior of locks
Hand
Defines the pivot location or the direction of movement. Certain conventions have been set up and used by the door industry
Hand Change Combination Lock
A type of combination lock that the combination is changed by taking the lock apart and moving certain parts. The lock is then reassembled
Hand Scan
A technique for biometric identification that measures three-dimensional hand geometry - the shape of the fingers and the thickness of the hand
Handed/Handing
Depicts the direction a door swings, i.e. from left or from the right,/p>
Hand Held Code Key Cutter
A hand operated key origination machine. This type of code machine is used to cut first keys when their depths and spacings are known
Handicapped Hardware
Specifically designed hardware that meets the ADA requirements
Handles
There are safe handles, lever handles and door (Grip) handles
Hand of Combination Lock
The orientation fo the combination lock within its mounting. The hand is indicated by the location of the combination bolt lock. As viewed from the rear of the lock. There are four positions: Vertical Up, Vertical Down, Right Hand, and Left Hand
Hand of Doors
Doors open in different directions, and to simplify non-reversible hardware such as locks, the opening of a door and the direction in which it opens that has been standardized. There are locks that specify either right or left hand opening
Hand of Lock
Refers to the adaptability of the lock to function on left or right hand doors
Hardened
This refers to heat tempered steel. The steel is heated to a predetermined temperature and then quenched in oil or water for rapid cooling. The finished products are used on surfaces which require additional protection
Hardened Cylinder Ring Insert
A piece of hardened material which is placed inside a cylinder ring, to provide protection for the extended portion of the lock cylinder
Hard Plate
Any of a variety of drill resistant metals which are positioned between the safe door and the lock to prevent forced entry
Hard Wire
An alarm system where the components are connected with wire
Harmon Hinge
A hinge designed to swing a door into a pocket at a right angle with the frame
Hasp
A fastening device consisting of a loop and a slotted hinge plate, normally secured with a padlock
Hasplock
A padlock permanently attached to a hasp
Hasp and Staple
A special type of hasp which has two or more metal plates which are interconnected with staple type metal strips. The hasp and staple style of hasp has more flexible applications than the standard hasp
Header
The main extrusion that forms the top structure of an automatic door and which contains the controls and operators
Heel-And-Toe Locking Padlock
A type of padlock that locks the shackle both at its free end and at the end where the shackle meets the lock body
Heel of a Padlock
The end of the shackle on a padlock which is not removable from the case
Hertz (Hz)
The international unit of frequency equal to one cycle per second; named after the German physicist Heinrich Rudolph Hertz (1857-1894)
Hex Key
A hexagonal wrench used for driving certain types of screws and other fasteners. Also known as an Allen Wrench
High Security Locks
Locks that are designed to resist unauthorized entry and to provide a significant amount of key control
High Security Cylinder Cover
A thick, heavy piece of metal having a small hole in it, which is installed over the outside of a lock cylinder, so as to leave only the cylinder plug visible. The purpose of the cover is to protect the lock cylinder from forcible attack
High Shoulder
A style of padlock where the legs of the shackle slide into raised portions of the padlock body when locked. This style of padlock is more secure since the shackle is less accessible
Hinge
Two plates pined together by a pin and attached to a door and its frame whereby a door is supported and is enabled to swing or move
Hinge Filler Plate
A plate installed in hinge cutout when hinge is not required
Hinge Jamb
A vertical piece of a door frame prepared for installation of hinges
Hinge Stile (of a door)
The stile to which the hinges are applied as distinguished from the lock stile
Hinged Latch Bolt
See Swinging Latch Bolt
Holdback Cam
A free rotating cam on the rear of a mortise cylinder. The cam is controlled by the retainer and its direction is limited by a pin positioned for either LH or RH applications
Hold Open
Function of a door closer, which enables the closer to hold the door in the open position usually at a point of maximum opening
Hold-Open Time
The time a door remains fully open after loss of detection
Hold-Up Alarm Trip Cylinder
A type of cylinder, usually of the pin-tumbler type, that can be operated by either of two keys. One of the keys only opens the lock; the other key opens the lock, and at the same time, activates a hold-up alarm
Hole Filler Plates
Metal plates designed to convert a cross bore opening in a door to a different application
Hole Saw
A tool used in the chuck of a drill motor, in order to cut a circular hole in wood, metal, or similar materials. The hole saw removes only a thin ring of material, producing a hole and a cylindrical plug
Hollow Core Door
A door whose interior is empty except for rails which hold the two outer sheets together
Hollywood Door
See Dutch Door
Homerun
A wiring method in which each device has a separate wiring run to the control panel
Hookbolt
Locking mechanism for sliding doors. Often used on sliding aluminum entry doors
Hook Pick
A type of pick that has a curved end, used to reach a short tumbler that is behind a longer one
Horizontal Spring Hinge
A spring hinge mortised horizontally into the bottom rail of a door and fastened to the floor and head frame with pivots
Horn
The cylindrical portion of the safe deposit lock horn plate surrounding the plug. Also known as a Nose or Nozzle
Horn Plate
The cover which secures the lock components in a safe deposit box lock case. There are single and double horn plates
Horseshoe Lock
A very large padlock with a U-shaped shackle, used to secure a bicycle or motorcycle
Host Computer
A computer that primarily provides services such as computation, data base access, or special programs and/or services
HSPD
Homeland Security Presidential Directive
HSPD12
Homeland Security Presidential Directive calling for a mandatory government-wide standard for secure and reliable forms of ID issued by the federal government for access to federally controlled facilities and networks
Hotel Grand Master Key
A single key that operates all of the locks throughout the hotel, with the exception of the privacy doors
Housekeeper's Key
In a hotel or motel lock system, a master key or grand master key that operates the lock on two or more different groups of guest rooms
Housing
Casing which contains all internal lock parts. Also known as a Case
Housing Wrench
Tool used to tighten and loosen certain styles of interchangeable core mortise cylinders
Hub
The part of a lock through which the spindle passes to actuate the mechanism
Hubspring
A spring fitted to the hub of a lock to restore it to its normal position after having been actuated
I.C.
Acronym for Integrated Circuit. A type of solid stated electronic component used in sensors and controls. Sometimes referred to as a “chip”
I.C. Core
See Interchangeable Core
I/D
Abbreviation for Inner Diameter
I/O Input/output
iButton®
A microchip similar to those used in smart cards but housed in a round stainless steel button about a half inch in diameter, which can be attached to a key fob or jewelry. iButtons are extremely rugged, but are not available with RFID technology for contactless use
IFPO
International Foundation for Protection Officers. A non-profit organization founded for the purpose of standardized training and certification of protection officers. Its Security Supervisor Training Manual is a reference guide for protection officers and their employers
Impressioning Plate
Metal plate with five or more openings. These openings are designed to secure door, deck, and assorted cam locks in order to impression
Impression Marks
Indentations made by the tumblers on the key blank blade when the proper pressure is exerted. Impression marks are used to determine the depths of cut in order to originate a key
Impression System
A means for fitting a first key to a lock. Impressioning requires the use of a key blank, a pair of locking pliers, and a file to make the key
Impression Tool
A handle for the key blank which is being impressioned. Tools include specialized impressioning tools and locking pliers
Inactive Door (or leaf)
That leaf of a pair of doors that does not contain a lock, but is bolted when closed, and to which the strike is fastened to receive the latch or bolt of the active door
Increment
The measurement of the smallest possible difference between two cuts in a key of a given lock. This would be represented by the difference between a number 3 cut and a number 4 cut, or between a number 8 cut and a number 9 cut. The actual distance might be 0.015 inch, or 0.020 inch, or 0.0125 inch, and so on
Incrementing A Key
The process of changing the combination of a key by altering a cut, one increment of depth at a time
In-Cylinder Doorway Viewer
A type of doorway viewer that has its outside parts mounted inside a rim cylinder
Index
A line or mark with which the numbers are lined up, when dialling the combination of a lock
Indicator
1. A device used in connection with locks to indicate a variety of situations including locked, occupied, etc. 2. A button inserted into a safe deposit lock plug keyway to indicate unpaid rent or an unrented box. It also prevents key insertion
Indicator Button
A device used in connection with a hotel lock to indicate whether or not the room is occupied
Induction
An influence exerted by a charged body or by a magnetic field on neighbouring bodies without apparent communication; electrifying, magnetizing, or inducing voltage by exposure to a field
Indicator Pin
In a key-in-knob lock of the hotel or motel function, a pin which, when protruding from the face of the cylinder plug, indicates the fact that the normal keys will not operate the lock at the time in question
Individual Cut
A cut that occurs in the combination of an individual key in a master key system
Individual Key Section
A key section whose key blank will enter only those cylinder plugs that have a key slot or keyway specifically designed to accept that key blank
Infrared Filter
Filter used to make light beam in photoelectric system invisible to the human eye
Infrared Sensors
Sensors designed to operate within the range of invisible radiation wavelengths. There are active, beam, illuminator, and passive infrared sensors
Infrared Shadow Card
A type of access control card that has a bar code sandwiched between two layers of plastic. The reader passes infrared light through the card, and the shadow of the bar code is read by sensors on the other side
Ingress
Free access inside from the outside
Inhibit
Signal used to temporarily control alarm from activating. A purpose to inhibit an alarm system is to permit authorized entry into an area
Inner Bushing
Part of a plug and inner bushing assembly of a tubular lock that contains the tumbler holes and the top tumblers
Inner Spindle Assembly
A component of the manipulation proof series. It connects with the knob to actuate the cam slide
Inrush
The initial surge of current through a load when power is first applied. Lamp loads, inductive motors, solenoids and capacitive load types all have inrush or surge currents higher than the normal running or steady state currents. Resistive loads, such as heater elements, have no inrush
Inhibit
Signal used to temporarily control alarm from activating. A purpose to inhibit an alarm system is to permit authorized entry into an area
Inner Bushing
Part of a plug and inner bushing assembly of a tubular lock that contains the tumbler holes and the top tumblers
Inner Spindle Assembly
A component of the manipulation proof series. It connects with the knob to actuate the cam slide
Insert
The portion of the construction master key which remains in the cylinder. The insert is removed using an extractor key. There are pin tumbler and wafer tumbler cylinder inserts
Installation Kits
The tools necessary as determined by the product manufacturer or company selling the installation kit to install said product
Insulated Glass (Double Pane)
Glass panes separated by air or gas. The air/gas is trapped between the two pieces of glass and acts as an insulator
Insulation
A material which does not readily conduct electricity. The coating on wire is an insulator which prevent wires from "touching" each other electrically
Insulator
An insulator is just the opposite of a conductor; it offers very large opposition to current flow. For example, rubber, glass, paper, air, and varnish are good insulators
Integral (locks and latches)
A term used to describe a type of mortise lock having cylinder in the knob
Interchange
A condition in a master key system whereby a key operates a lock other than the one or ones it is intended. This is referred to as Crosskeying
Interchangeable Core (IC)
Unlike a standard key cylinder, which is accessible for combinating only via locking device disassembly, an interchangeable mechanism relies upon a specialized "control" key for insertion and extraction of the essential (or "core") combinating components
Interlock
A system of multiple doors with controlled interaction. Interlocks are also known as lighttraps, airtraps, mantraps and sally-ports (See safety interlock, security interlock)
Interlocking Pin Tumblers
These high security, notched tumbler, master, and driver pins are designed to align for detachment from each other when the proper angle cut key is inserted. This enabled the plug to rotate. The angled cuts in the key rotate the pins back to the attachment position when the key is removed from the plug
Interlocking Pin Tumbler Cylinder
High security pin tumbler cylinder of a specific design to accommodate specialized notched pins. The cylinder plug has six circular grooves, central to the tumbler pin holes. See also Interlocking Pin Tumblers
Intermediate Sleeve
The sleeve adjacent to the inner bushing which contains the mastered tumblers. Part of the sleeve in a master keyed tubular lock
Intermittent Duty
A solenoid designed to be energized for short periods of time. Continuous operation may damage an intermittent duty solenoid
Internal Relocking Device
A relocking device that is built into the inside of the case of a combination lock
Internal Set Screw
In certain removable-core mortise cylinders, a screw that is only accessible when the core is removed, and which can be used to hold the cylinder in a mortise lock
Interstitial Cuts
Cuts that are made in the spaces between the normal cuts of a key
Intrusion Alarm
See Burglar Alarm
Intrusion Detector
Any contact or foil which is connected into the protective circuit. The detectors open the circuit when a break in occurs
Intrusion Sensors
Sensors designed to detect unauthorized entry. There are interior and exterior intrusion sensors
Inverter
An electrical product which converts low voltage DC to high voltage AC
Invisible Hinge
A hinge so constructed that no parts are exposed when the door is closed
Iris Scan
A technique for biometric identification that maps the pattern of colors in the iris of the eye
ISO-14443
A series of international vendor independent standards for proximity RFID that establishes guidelines for two types of smart cards (A & B). The most common application requires a read within 4 inches of the reader and includes Classic MIFARE, EV1, DESFire and PIV
ISO-15693
A series of international vendor independent standards for vicinity RFID that establishes guidelines for smart cards that can read up to 1.5 meters
Jamb
A vertical piece of a door frame assembly, adjacent to wall
Jamb Depth (Frame Profile)
The overall width of frame profile - face to face dimension
Jimmy
1. A type of tool which is used for prying objects apart, such as in prying a door away from a frame. 2. To pry apart by using a jimmy
Jimmy Resistant Lock
Type of lock that has a vertical movement in the bolt to resist prying the door away from the jamb to bypass the bolt. The bolt, in the locked position, is surrounded by a sectional hollow strike
KA
Abbreviation for Keyed Alike
KD
Abbreviation for Keyed Different
Keeper
See Strike
Key
A key is an instrument for operating a lock by setting the tumblers in the proper position. It can be removed for carrying, but must be inserted and used in the proper manner in the lock for both unlocking and locking the lock mechanism
Key Accessories
Any of a variety of products related to keys. These include key chains, holders, rings, clips, etc.
Key Blank
A coined and blade broached slug prior to having cuts applied. A finished but uncut key
Key Change
The combination of cuts in a key that enable it to operate the lock for which intended
Key Change Wheel
Combination lock wheel whose individual combination can be changed using a key. Normally there is a slot in the lock case permitting the combination to be changed without having to open the lid
Key Changeable Combination Lock
A combination lock designed to have the combination changed by using a special key without having to disassemble the lock
Key Code
A line of numbers and/or letters which enables the manufacturer or locksmith to originate a key without having a sample
Key Control
The lock manufacturers, distributors, and/or locksmith’s ability to limit the unauthorized duplication of keys which can operate their locks. Some methods of key control include: restricted keyways, unique keys which are too complicated to duplicate and legal protection which restricts unauthorized manufacture of key blanks
Key Cutter
An individual who duplicates keys and may provide some locksmith services
Key Gauge
Metal plate with specific depth measurements cut out. These plates are used to decode the depths of cut in a key
Key Locking Dial
A dial that can be locked with a key to prevent rotation
Key Locking Dial Ring
A dial ring containing a key lock to lock dial and prevent rotation
Key Lock Switch
An electrical switch that can only be operated by a key. See also Switch Lock
Key Machine
A manual or powered machine designed to remove material from the blade of a key blank to originate or duplicate a key. There are a number of different types and styles of key machines
Key Override
The ability of a mechanical key to operate an electronic lock at any time
Key Picking
The technique of picking a single throw wafer lock using a key blank
Key Pilot
Guide for the key to help it slide easily into the lock. The pilot might be grooved at the keyway entrance or have a contoured shape to the face plate
Key Plate
A small plate or escutcheon having only a keyhold (See Drop Escutcheon)
Key Profile
See Key Section
Key Reading
Determining the depths of cuts on a key in order to originate a new key using the determined depths
Key Records
Documents used to indicate all pertinent information for keying systems. Key records contain at least the identification of the end user, the bitting list, key bitting array, cylinder location schematic, names of persons who can receive duplicate keys, names of persons who control master keys, and number of keys per cylinder issued
Key Removable Cylinder
A lock cylinder similar in concept to the removable core and interchangeable core cylinder. In some types of key-removable cylinders, the inner part of containing all the tumblers and springs and the housing has a portion of the face plate of the knob lock or dead bolt
Key Retaining
The function of a lock that allows the key to be removed in one position only, usually in the locked position
Key Retention
The function in which a lock must be locked before the key can be removed. Also known as Keystop
Key Ring
A metallic ring that is used to keep a number of keys together. There are give away key rings, hinged rings, split rings, etc.
Key Section
The cross sectional shape of the blade of a key blank, made up of ridges (or lands) and grooves. The key section as displayed in a key blank catalog is generally viewed from bow towards the tip of the key blank. The shape of the key's section determines the keyways it can enter
Key Side
A reference point used to determine outside of door - sometimes required for handing or determination fo secure side of glass bead or louvers
Key Slot
The slot in a cylinder plug, designed to accept a key of a certain cross section. Also known as Keyway
Key Symbol
Character designation used for each key combination in the standard key coding system. A matching symbol is used to identify the compatible lock. For example, AA1. Also known as Keying Symbol
Key Tag
A metal or paper tag that can be maintained with a key to identify the keys location or any other information
Key Trap Cylinder
A lock cylinder or core specifically designed to trap a key after an attempt has been made to rotate the plug
Key Vice
The part of a key cutting machine which secures the key during the origination or duplication
Key fob
Specific form factor of credential that generally refers to a hard plastic disk that is carried on a key chain
Keyhole
The opening in a lock to receive a key (usually a bit key)
Keyhole Lock
A small pin tumbler lock that can be inserted into the keyhole of a bit key lock, in order to prevent the bit key from being inserted
Keying
Combination specifications for a cylinder or group of cylinders in order to control access
Keying Kit
A container which has a number of compartments that hold an assortment of tumblers, springs, and other parts necessary to combinate a lock cylinder
Keying Levels
Tumbler type cylinders offer the possibility of very complex arrangements. These are the basic terms: A. Individual Key - A key for a single cylinder. Also known as a Change Key B. Keyed Alike - All cylinders may be operated by the same key (not to be confused with Master Keyed) C. Keyed Different - A different key operates each cylinder in a group of cylinders D. Master Key - A key to operate a group of cylinders, each of which may be set to a different change key E. Master Keyed - All cylinders in a group can be operated by one master key, although all cylinders may be keyed differently (not to be confused with Keyed Alike) F. Maison Keyed - All change and master keys will operate this cylinder G. Keyed-to-Pass - Denotes a cylinder set to accept a limited number of different change and/or master keys
Keying A Lock
The way in which a lock is set to be operated by one or more keys
Key-In-Knob Lock
A lockset having the cylinders contained in the knob. Also known as a cylindrical lock
Keyless Lock
1. A lock which operates either by combination or electronically, which does not require a key to operate. 2. A lock which is designed to act as a sealing mechanism, so that once it has been locked, it can only be opened by destruction of the lock
Keystop
A protrusion that prevents a key from moving past a particular point on a locking device
Keyway
The aperture in lock cylinders that receives the key and closely engages with it throughout its length
Keyed Alike (KA)
A keying option which allows for any number of cylinders to operate by the same key
Keyed Different
Two or more lock cylinders with different tumbler arrangements and each using its own key. Abbreviated as KD
Kick Down Holder
A type of door stop that kicks down to hold the door open; locks in the up position to allow the door to open freely
Kick Plate
A protective plate applied on the lower rail of the door to prevent the door from being marred
Knife Edge A Key Blank
To file the working edge of a key blank to a very thin, tapered shape. This is sometimes done in order to make it easier to use the key blank in the impressioning of a lock
Knob
1. A projecting grip, usually spherical in shape designed to retract the locking mechanism. 2. Component of the manipulation proof series. It is connected with the inner spindle assembly; when turned actuates the cam side
Knob Lock
1. A type of door lock which has the lock cylinder mounted into the knob or knobs. 2. A type of lock which has a knob or knobs among its component parts
Knob Retainer
A lock part, usually in the form of a spring loaded plunger, which is used to secure a knob onto its spindle
Knob Shank
The projecting stem of a knob into which the spindle is fastened
Knob Spindle
A type of lock part which is used to transmit the motion from the knob to the locking mechanism. There are swivel straight, and two piece split spindles. Spindles are threaded and/or have through holes to accommodate the knobs
Knob Top
That part of the knob that the hand grasps
Knobset
Term used by several lock manufacturers to indicate their complete knob locks
Knocked Down (KD) Frame
A door frame furnished in three or more parts for assembly in the field
Knuckle
The enlarged part of a hinge into which the pin is inserted
Labeled
Hardware which has successfully completed testing in order to be permitted to be installed in a fire rated opening
Lacing
A network of fine wire surrounding or covering an area to be protected, such as a safe, vault, or glass panel, and connected into a closed circuit system. The network of wire is concealed by a shield such as concrete or paneling in such a manner that an attempt to break through the shield breaks the wire and initiates an alarm
Laminated Glass
A type of safety glass that holds together when shattered
Laminated Padlock
A padlock, the body of which consists of a number of fast plates, most of which (if not all) are of the same contour, super imposed and riveted or brazed together. Holes in the plates or in most of them provide spaces for the mechanism and the ends of the shackle and key
LAN
Local area network
Lands
The protruding areas of the key blade which partially determines its shape. The shape of a key blade is determined by the millings and lands
Latch
A device that secures but has no locking function. Also known as a Latch Bolt
Latch Bar
The rear end of some latch bolt designs which mounts into the retractor of the lock. The retractor pulls on the latch bar to retract the latch bolt, permitting the door to open
Latch Bolt
A lock component which projects from the assembly in an extended position, but is forced back into the lock case by end pressure or drawn back the mechanism. When the door is closed, the latch bolt engages the strike, and holds the door in the closed position
Latch Bolt Keeper
The component of an electric strike which captures the lock's latch bolt and secures the door from opening. Many latch bolt keepers are shaped to accommodate a specific shape of latch bolt
Latch Bolt Sensor
An electrical component which senses the latch bolt when it is captured in electric strikes equipped with a latch bolt sensor
Latch Front Adapter
An adapter positioned behind the strike cover plate. This using reduces the opening size to one inch wide for one inch square front latches
Latch Guard
See latch protector
Latch Mortiser
A tool used to cut out the opening in a wooden door for the latch face of a lock
Latch Prongs
The rigid legs of the latch bolt which engage the housing of the outside lock unit
Latch Protector
A piece of hardware (attached to door) that completely covers the latch area protecting the latch bolt from prying and shimming. Also known as latch guard
Latch Range
The distance between the end of the sweep range and the door closed position when adjusting a door closer. This final twelve inches or so requires additional pressure for positive latching of the lock or exit device. See also Sweep Range
Latch Retractor
A type of lock part which is used to transmit motion to the latch, in order to pull it away from the strike plate. One this occurs, the door can be opened
Lazy Cam
A cam capable of rotating against the lock's plug. This can occur even though the lock's plug is rigid
L.E.D.
Acronym for Light Emitting Diodes. A solid state lamp commonly used as an indicator in sensors and controls
Leading Door Edge
The edge of the door opposite the hinges which opens first in a double door situation
Leading Edge
The vertical edge of the door opposite the hinge
Leaf (of a pair of doors)
One of the two doors forming a pair of doors
Left Hand Door
A door which, when viewed from the outside, has its hinges on the left hand side, and opens inward. See also Hand of Doors
Left Hand Key Slot
A key slot or keyway which, when viewed as it would appear in an installed lock, has its lowermost ridge on the left hand side of the key slot
Left Hand Reverse Bevel Door
A door which, when viewed from the outside, has its hinges on the left hand side, and opens outward. See also Bevel
Left Hand Thumb Side
The face of a key that is in contact with the thumb of the left hand of the user, when the key is held in the left hand and inserted into the lock
Letter Box Lock
A type of lock that is used on a box to which mail is delivered at a private address (not inside a post office). There are two styles of letter box lock, the pin tumbler and lever. Also known as a mail box lock
Letter Box Back Plate
A plate, similar to a letterbox plate, attached to the inside of a door to allow the passage of mail
Letter Box Plate
A date attached to the door with an opening to permit insertion of mail
Lettered Key Section
A key section which is designated by its manufacturer with one or more letters of the alphabet
Level of a Key
The position of a key in the organization of a master key system. Keys that have the higher level numbers are those which operate larger groups of locks
Levels of Security
The range of security protection, low to high, provided at concentric perimeters -the least secure at the outermost perimeter (such as entry to the building) and the most secure at the innermost perimeter (such as access to a rack)
Lever
1. The locking components in a lever lock which controls the retraction of the bolt. When the proper key has been inserted, the levers align when the key is rotated, permitting the bolt to retract. (2) Serves to retract the bolt in a combination lock when the proper combination has been aligned
Lever Actuator
An arm which extends out of the housing from a Chrysler ignition lock when a key is inserted into the keyway. This lever activates the key buzzer switch
Lever Handle
A horizontal handle for operating the bolt(s) of a lock
Lever Handle Lock
A type of lock in which the latch is retracted by turning a lever on the inside or outside of a door. The lever or levers take the place normally occupied by a knob or a pair of knobs. Specific lever handle lock designs are being required by handicap codes. Also known as a Lever Lock and a Leverset
Lever Lock
See Lever Handle Lock
Lever Operated Key Duplicating Machine
A type of key making machine in which the operator moves a lever from side to side, which in turn moves the vices in relation to the guide and the cutting wheel. Also known as a semi-automatic key duplicating machine
Lever Screw
Attaches lever to the bolt in certain styles of combination locks. The lever screw can act as a travel stop for the bolt
Lever Tumbler
Flat tumbler having a pivoted motion actuated by the turning of the key and controlling the locking function
Leverset
See Lever Handle Lock
Lever Spring
A spring staked into the post end of the lever to provide directional tension on the lever or fence. Some levers and springs are die cut in one piece
Lever Stop
In a combination lock case, a molded portion of the wall which prevents the lever entering the unlocked position without the proper combination first dialled
Lift (of a Key)
Any part of the top of the key blade which raises a lever
Lift (Radius)
The concave area on the lever bottom edge which is swept by the key cut
Light Emitting Diode (LED)
A diode, a solid-state device, that gives off virtually heatless colored light when electric current is passed through it. LEDs are very efficient and long-lasting and are often used for digital readouts and annunciators. Common colors include red, green and amber
Light Intensity Cutoff
In a photoelectric alarm system, the percent reduction of light which initiates an alarm signal at the photoelectric receiver unit
Limit Arm
A device used to limit how far a panel can swing when broken out
Limited Access Cam
In certain mortise type hotel or motel function locks, a cylinder cam which is able to be rotated by the normal individual keys and master keys
Limited Access Key
In a certain type of entrapment lock system, a key which will only operate the lock at certain times when the lock has been programmed to accept that key. At other times, the limited access key will be trapped by the lock
Line Amplifier
An audio amplifier which is used to provide pre-amplification of an audio alarm signal before transmission fo the signal over an alarm line. Use of an amplifier extends the range of signal transmission
Line Drop
A voltage loss occurring between any two points in a power or transmission line. Such loss, or drop, is due to the resistance, reactance or leakage of the line
Line Resistance
The opposition to current flow offered by the conductors (interconnecting wiring) in an electrical circuit. It is analogous to water moving in a pipe. The smaller the diameter of pipe (conductor) the higher the resistance to flow, conversely, the larger the diameter of a pipe the lower the resistance. The longer the run of conductor the higher the resistance
Line Sensor (Detector)
A sensor with a detection zone which approximates a line or series of lines, such as a photoelectric sensor which senses a direct or reflected light beam
Line Supervision
Electronic protection of an alarm line accomplished by sending a continuous or coded signal through the circuit. A change in the circuit characteristics, such as a change in impedance due to the circuit's having been tampered with, will be detected by a monitor. The monitor initiates an alarm if the change exceeds a predetermined amount
Link
A connecting plate between two moving parts
Linkage
The equipment used to interconnect the locking mechanism in an automobile with the door or deck lock
Linking
When an input changes the state of an output
Lip of a Strike
The projecting part on which the latch bolt rides
Lite
Preparation in a door for view window, vision and/or glazing including glass stop and glazing bead
Lite Kit
A frame inside of a door used to hold glass in place
Live Trap
A trap in which the trap wire carries the protective circuit current
Load
A device which uses or consumes power. The larger the load is the less the resistance or opposition to current flow for a given voltage. An electrical load converts electrical energy into some other form of energy such as heat, light, sound, mechanical energy, etc.
Local Alarm
A self contained alarm system which when activated makes a loud noise at or near the protected area and/or floods the site with light
Locating Boss
An integral part of the case used to align the lock in mounting (not used in all locks)
Location Specific Alarm System
A close range personal transmitter to receiver to control center system. Personal security for institutions and hospitals
Lock (electric)
Fail Safe - A lock that is designed to unlock in the event of a loss of power Fail Secure - A lock that is designed to remain locked in the event of a loss of power Magnetic (sometimes called Electro-Magnetic) - A lock using a magnetic coil that acts against a steel plate to lock a door Solenoid - A lock that utilizes a coil and metal plunger to physically lock and/or unlock a door
Lock Case
The housing into which all the components of a mortise lock and a combination lock are installed. Lock cases can be made of cast metal or stamped from metal plate
Lock Mechanism
The part of the lock into which the key is inserted. The lock mechanism contains the tumbler mechanism which secures and frees the locking mechanism
Lock Rail (of the door)
The horizontal member of a door intended to receive the lock case
Lock Set
A lock, complete with trim, such as knobs, escutcheons or handles
Lock Stile (of a door)
The stile to which the lock is applied as distinguished from the hinge stile
Locked On By Combination
See also Dial Ring
Locked on by Combination Index
Index mark on some combination lock dial rings. A combination dialled to this index to remove lock cover and/or change combination
Locking Dog
The part of a padlock which engages the shackle and maintains it in the locked position
Locking Lug
In an IC or RC cylinder, the part of the control sleeve that projects from the side of the core to secure the core in the cylinder housing
Locking Mechanism
Often mistaken for the lock. The locking mechanism is the actual part which stops access. This can include the latch and/or the bolt
Look Out Ball
In a lock of the hotel or motel function, a ball bearing that projects into the side of the key slot, in order to prevent the normal individual or master keys from being inserted into the cylinder plug
Lock Out Key
In some hotel or motel lock systems, a key (usually a small, flat spanner key) which is used to activate a device in the guest room lock, in order to prevent the normal individual and master keys from operating the lock. This key can be used by the hotel manager to make certain that a guest must first go to the manager, before being able to gain access to the guest room
Lock Out Plug
A piece of metal which can be inserted into the key slot or keyhole of a lock, in order to prevent the normal keys from entering the lock. The lockout plug normally has a vertical end to become bound against the pins
Lock Out Plug Extractor
A tool that can be used to remove a lock out plug from the key slow or keyhole of a lock
Lockout / Cutoff
Either a function or a device. To “lockout” or cutoff is to disconnect or disable a device
Lock Pick
Tools or instruments made for the purpose of operating a lock into a locked or unlocked condition by means other than the specifically planned key
Lock Picking
The process of operating a lock into a locked or unlocked condition by means other than the specifically planned key or keys, said means being manipulated within the lock in lieu of said operating key or keys
Lock Retainer
A component, usually a metallic plate or pin used to secure the lock mechanism into a housing or locking mechanism
Lockset
A lock complete with handles, trim, etc. A ready to install lock requiring now additional parts
Locksmith
An individual with the ability to key locks, repair locks, install locks, and bypass/neutralize locks
Lockswitch
A type of switch which is secured by a lock. Also known as a Key Lock Switch
Logic Circuit Lock
An electronic lock in which the key is a circuit board that can be identified by the electronic apparatus in the lock
Loiding
The action of slipping or shimming a spring bolt with a thing piece of celluloid or metal
Loop
An electric circuit consisting of several elements, usually switches, connected in series
Loose Joint Hinge
A hinge having but two knuckles; the pin is fastened permanently to one knuckle, the other contains the pinhole, whereby the two parts of the hinge can be disengaged by lifting. These hinges are handed
Loose Pin Hinge
A hinge having a removable pin to permit the two parts of the hinge to be separated
Louver
An opening in a door with a series of slats or blades to allow passage of air
Low Energy and Power Assist Doors
Swinging doors that meet the requirements of ANSI/BHMA A156.19
Low Voltage
Electrical current less than 120 volts. The common low voltages are 12, 24, and 48
Macro
A defined set of actions or commands that will be executed based on a trigger event
Magnetic Catch
A cupboard catch that uses a magnet to hold the door closed
Magnetic Sensor
A solid-state switch that turns on and off when a magnetic field is passed in front of it
Magnetic Stripe Card
A type of access control card that uses a magnetic strip to store information; read by inserting or swiping through a reader
Magstripe Card
See Magnetic Stripe Card
Manageable Device
Able to be monitored and controlled remotely. Manageable access control devices can communicate with a remote management system for monitoring (who’s coming and going and when), control (configuring the device to allow access to certain people at certain times), and alarm (notification of repeated unsuccessful access attempts or device failure)
Mantrap
An airlock-style arrangement having secured doors for entry and exit, with room for only one person between the doors. It is a solution to the security loophole called piggybacking or tailgating, in which an unauthorized person freely passes a security checkpoint by following an authorized person through an open door
Masking
Hiding or suppressing alarms which do not need to be viewed
Masonry Frame
A frame installed in a new or existing masonry or block opening
Master Key
Operates any quantity of cylinders of different individual key changes
Masterkeying
An arrangement of cylinders having individual key changes, which permits them all to be operated by a simple key called a master key
Masterkey System
An arrangement of cylinders having individual key changes, which permits them all to be operated by one key, called a master key
Meantime-Between-Failure
A prediction of the time interval between system failures. Should be measured in thousands of hours/possibly years
MIFARE®
A contactless and dual smart card chip technology produced by NXP that is fully compliant with ISO-14443
Mission Critical Facility
A facility that must operate 24/7/365 regardless of availability of power/water/fuel/etc. Examples would be corporate data center, 911 dispatch, military facilities
Mono Lock
See Preassembled Lock
Mop Plate
A narrow plate similar to a kick plate, of sufficient height to protect against the swish of the mop
Mortise
A cavity made to receive a lock or other hardware; also the act of making such a cavity
Mortise Bolt
A door bolt designed to be mortised into a door rather than applied to its surface
Mortise Cylinder
Screw in cylinder with a cam tailpiece
Mortise Exit Device
An exit device with the lock mechanism installed into a mortise provided in the edge of a door. Mortise exit devices can be either Panic or Fire Exit Hardware
Mortise Lock/Latch
A lock designed to be installed in a mortise rather than applied to the door's surface
Mortise Lock Prep
Cutout in the edge of a door for mortise lock. Also known as mortise lock prep
Mullion
A vertical member in an opening for two doors permitting each door to be operated and latched independently. The mullion may be removable or fixed
Multi-Meter
An instrument that combines several functions; usually resistance measurement, voltage measurement, and current measurement. This instrument is commonly called a VOM or OHM meter
Muntin
A vertical or horizontal member in a door leaf, other than the top and bottom members
Multi-Technology Credential
A credential that contains two or more technologies (i.e. proximity, smart card, magnetic stripe)
Multi-Technology Reader
A reader with the capability to read two or more card technologies (i.e. proximity, smart card, magnetic stripe)
Mute
See silencer
Narrow Lite Door (Design NV)
Design of door with narrow rectangular lite at lock stile of door
NCPI
Network-Critical Physical Infrastructure. Elements of a data center’s physical infrastructure (as distinguished from IT infrastructure such as routers and storage managers) that contribute directly to availability by ensuring uninterrupted operation. NCPI includes power, cooling, fire suppression, and physical security
NEC
National Electrical Code
Need to Know
A very high level of security, with access restricted to people who have a specific, immediate need to be in the secured area (for access to particular data, for example), with access only allowed for the time period during which that need exists
NIC
Network interface card
Nightlatch
An auxiliary lock having a spring latch bolt and functioning independently of, and providing additional security to, the regular lock of the door
NO/NC
Normally open/normally closed, refers to the normal circuit state of a switch/relay
Non-Extended Bypass
The alarm sounds if the door switch (or bar switch) is opened in the armed condition. The key is required to reset the alarm. If the door is open at the end of the arming delay mode, the device will sound
Non Removable Pin Hinge (NRP)
A hinge with a set screw in its barrel; to prevent the removing of hinge pin. Set screw is not accessible when door is closed. Used with outswinging exterior doors
O/D
Abbreviation for Outer Diameter
OHM
Unit of electrical resistance. One OHM is the resistance which allows one ampere of current to flow through a conductor at one volt
Ohm’s Law
Voltage = Current x Resistance
Olive Knuckle Hinge
A paumelle hinge with knuckles forming an oval shape
Overhead Concealed (O.H.C.)
A swinging door header that is above the door and between the jambs, as opposed to a surface mounted header
PAC
Personal Access Code. Another name for PIN (Personal Identification Number) - a code or password that identifies a user at an access point
PACR
Abbreviation for "Parallel Arm Closer Reinforcement" - Welded-in reinforcement, in frame head, for mounting of door closer
Pair Frame
A door frame, to accommodate two doors or a pair
Pair of Doors
See double doors
Panic Bar
See exit device
Panic Exit Device
See exit device
Panic Hardware
A door latching assembly incorporating an actuating member usually called actuating bar which releases the latch bolt(s) upon the application of force in the direction of exit travel Panic Hardware/Exit Device Types (according to ANSI/BHMA)
Type 1: Rim Exit Device
Type 2: Surface Vertical Rod Exit Device
Type 3: Mortise Exit Device
Type 4: Narrow Stile Rim Exit Device
Type 5: Narrow Stile Surface Vertical Rod Exit Device
Type 6: Narrow Stile Concealed Vertical Rod Exit Device
Type 7: Wood Door Concealed Vertical Rod Exit Device
Type 8: Metal Door Concealed Vertical Rod Exit Device
Type 9: Combination Rim and Surface Vertical Rod Exit Device
Type 10: Narrow Stile Mortise Exit Device
Type 11: Combination Mortise and Surface Vertical Rod Exit Device
Type 12: Combination Mortise and Concealed Vertical Rod Exit Device
Type 21A: Door Coordinator with Override Feature
Type 21B: Door Coordinator without Override Feature
Type 22: Removable Mullion
Type 23: Concealed Automatic Latching Two Point Bolts
Type 24: Surface Automatic Latching Two Point Bolts
Type 25: Automatic Extension Flush Bolt
Type 27: Self-latching Extension Flush Bolt Set
Type 28: Rim Exit Device incorporating a Dead Bolt
Panic Hardware/Exit Device Functions (according to ANSI/BHMA)
01: Exit only, no trim or blank escutcheon
02: Entrance by trim when actuating bar is locked down
03: Entrance by trim when latch bolt is released by key. Key removable only when locked
04: Entrance by trim when latch bolt is released by key or set in a retracted position by key
05: Entrance by thumb piece. Key locks or unlocks by thumb piece
06: Entrance by thumb piece only when released by key. Key removable only when locked
07: Entrance by thumb piece. Inside or outside key locks or unlocks thumb piece. Outside key releases latch
08: Entrance by knob or lever. Key locks or unlocks knob or lever
09: Entrance by knob or lever only when released by key. Key removable only when locked
10: Entrance by knob or lever. Inside or outside key locks or unlocks knob or lever. Outside key releases latch
11: Entrance by control turnpiece. Key locks or unlocks control
12: Entrance by control turnpiece only when released by turning key. Key removable only when locked
13: Entrance by key or combination lock
14: Entrance by trim when latch bolt is released by knob or lever. Always active, no cylinder
15: Entrance by trim when latch is released by thumb piece. Thumb piece always active, no cylinder
16: Entrance by trim when latch is released by control turnpiece. Turnpiece always active, no cylinder
17: Entrance by control turnpiece. Inside or outside key locks or unlocks turnpiece. Outside key releases latch
Paracentric
A term used in connection with cylinder plugs having projections on the sides of the keyway that extend beyond the vertical center line of the keyway
Passage Function
Doors do not lock. There is no key cylinder and no means to lock a passage set. BHMA function 14
Paumelle
A style of hinge embodying a single pint of the pivot type, generally of modern, or streamlined design
Peanut Cylinder
A type of pin tumbler mortise cylinder which is much smaller in diameter than a standard size cylinder. The peanut cylinder is 3/4" in diameter and the standard cylinder is 15/16" in diameter. This type of cylinder is often used in aluminum-and-glass type storefronts
Physical Security
Protecting physical facilities from accidents or sabotage caused by the presence of unauthorized or ill-intentioned people. A physical security system includes access control devices for automated screening at entry points, plus a sensor-based alarm system. Additional protection may include camera surveillance and security guards
Piano Hinge
See Continuous Hinge
Piggybacking
The security breach that occurs when an authorized person, having unlocked a door using legitimate credentials, holds the door open for an unauthorized person to follow through the checkpoint with no credentials. (See Tailgating)
PIN
A code or password that identifies a user at an access point
Pin Tumblers
Small sliding pins in a lock cylinder, working against coil springs and preventing the cylinder plug from rotating until the pins are raised to the proper alignment by bitting of key
PIV
Personal identification verification
Pivot
See Door Pivot
Plug (of a cylinder)
The round part containing the keyway and rotated by the key to transmit motion to the bolt(s)
Pocket Door
A door that is prepared to slide into a pocket built in the wall
Poke Hole
See Access Hole
Potentiometer (POT)
An electronic device used to vary electrical voltage. These are present in many controls as adjustments to vary range, sensitivity, speed, or timing
Power Assist Close (P.A.C.)
A swinging door that has a spring to close the door; but, in addition, applies a low voltage to the motor to assist in closing or holding closed a door in the case of wind load or extra heavy doors. This type of control may keep a low voltage on the motor at all times, even when the door is closed. The term “power boost” is sometimes used to describe this system
Power Open - Power Close (P.O.P.C.)
A door that both opens and closes under power
Power Open - Spring Close (P.O.S.C.)
A door that opens under power but is closed by a spring
Preassembled Lock
A lock that has all the parts assembled as a unit at the factory, and when installed in a rectangular notch cut into the door edge, requires little or no disassembly
Preparatory Key
See Guard Key
Prison Lock
A heavy lock designed especially for use on jail cells
Privacy Function
Outside knob/lever locked by pushbutton on inside knob/lever. Rotating inside knob/lever or closing door releases/unlocks button. Emergency release in outside knob/lever
Proximity Credential
An access control card that has an onboard RFID transmitter/receiver, allowing it to communicate with a reader from a distance of up to one meter (3 feet). Typically 125KHz frequency
Prox Card
See Proiximity Credential
Proximity Smart Card
A smart card that has RFID technology in its chip, so that it can communicate with the reader from a distance of up to 10 cm. (4 inches). Also called a contactless smart card. Typically 13.58MHz frequency
Push Bar
A horizontal bar surface applied to a door leaf
Push Plate
A plate applied to the lock stile to protect the door against soiling and wear
PVD
Process of applying a coating/finish on a product with positive vapour
Quadrant (Dutch Door)
A device to fasten together the upper and the lower leaves of a Dutch door
Rabbet
A term used to describe the abutting edges of a pair of doors or windows so shaped as to provide a tight fit. One half of the edge projects beyond the other half, usually 1/2. Also used to define that portion of a door frame into which the door fits
Rabbeted Lock/Latch
A lock in which the face conforms to the rabbet found on a rabbeted door
RACR
Abbreviation for "Regular Arm Closer Reinforcement" - Welded-in reinforcement, in frame head, for mounting of door closer
Rail (of a door)
A horizontal member that pins the stiles. May be exposed as in a paneled door, or concealed as in a flush door
Rectifier
A solid state electrical device that will allow current to flow in one direction. It is designed to convert AC current to DC current
Reed Switch (aka Magnetic Switch)
A switch made up of two metal reeds. This switch is closed or opened by a magnetic field. These are usually encased in either a tubular or rectangular plastic housing
Reinforcing Unit
metal box-shaped reinforcement for use in a metal door in which a bored lock is to be installed. It provides both vertical and horizontal latch support
Relay
An electro-mechanical device that enables several circuits to be switched simultaneously under the command of a single signal. There are many types and sizes. Some common ones are S.P.S.T. (Single Pole Single Throw), S.P.D.T. (Single Pole Double Throw), D.P.S.T. (Double Pole Single Throw), and D.P.D.T. (Double Pole Double Throw). Relays are rated in terms of coil voltage, contact current ratings, and contact voltage ratings
Removable Mullion
A mullion which can be temporarily taken out of opening to allow the passage of large objects through the opening
Resistor
An electronic component that resists current flow. There are various types and power ratings. The value is expressed in OHMs and the rating in watts. They also have tolerances
Retinal Scan
A technique for biometric identification that maps the pattern of blood vessels in the retina of the eye
Return
The return leg at the back of frame profile
Reveal
The distance from the surface of a swinging door leaf to the mounting surface of the operator
Reverse Bevel
See Bevel
Reversible Lock
A lock which, by reversing the latch bolt, may be used by any hand. On certain types of locks, other parts must also be changed
REX
A request-to-exit device used as an input on an access control system to signal authorized egress
RFID
Radio frequency identification. Communication between card and reader without physical contact. RFID technology is what makes proximity cards, vicinity cards, and contactless smart cards work. The RFID chip is powered by an electromagnetic field from the reader
Rigid Cam
See Fixed Cam
Rigid Lock
See Preassembled Lock
Rim
A term indicating articles of hardware designed for application to the surface of doors and windows
Rim Cylinder
Cylinder often used with exit devices because of long cut able tailpiece for outside key control trim that inserts into device
Rim Exit Device
An exit device with the latching mechanism applied to the face of a door. Rim exit devices can be either Panic or Fire Exit Hardware
Roller Latch
A friction door latch employing a roller latch head under spring tension, which engages a strike having a recess formed to receive the roller
Roller Strike
A strike having a rolling member at the point of latch bolt contact to minimize friction
Rose
A trim plate attached to the door under the knob. It sometimes acts as a knob bearing
Rough Opening
The size of a wall opening into which frame is to be installed
Rounded Front
A lock or bolt front conforming to the rounded edge of a double acting door. The standard radius is 4" (101.6 mm)
Safety Interlock
A multidoor system in which all doors are normally closed and unlocked. Opening any door will lock all other doors
Sash Balance
A spring device used to counterbalance the weight of a window sash or other vertical sliding part
Sash Center
A pivoted support for transom or sash and comprised of two parts, one of which contains a pivot, the other a socket for the pivot
Sash Chain
A metal chain adapted for use with sliding sash, attached to the sash and to the counterbalancing sash weight
Sash Cord
Cord or rope used similarly to sash chain and in place of chain
Sash Cord Iron
A small metal holder inserted in the edge of the sash, to which sash cord or sash chain is attached
Sash Fast
A fastener attached to the meeting rail of double-hung windows
Sash Lock
A sash fast with a locking de vice controlled by a key
Sash Pole
A wood or metal pole to which a sash pole hook is attached
Sash Pole Hook
A metal hook attached to a wooden or metal pole used to lower or raise a transom or sash beyond hand reach
Sash Pulley
A pulley mortised into the frame of a double-hung sash frame over which the sash cord or sash chain passes
Sash Socket
A metal plate containing a hole or cup to receive a sash pole hook
Sash Weight
A weight used to balance sliding sash, usually of cast iron or, if conditions require, of lead
Screen Door Latch
A small locking or latching device used on screen doors and operated by a knob or a lever handle
Screwless Knob
A knob attached to a spindle by means of a special wrench as distinguished from the more commonly used side knob screw
Screwless Rose
A rose with concealed method of attachment
SDK
Software Development kit
Secret Gate Latch
A surface-applied latch operated by a concealed button or other device; usually used on office gates
Security Interlock
A multidoor system in which all doors are normally closed and locked. Opening any door will will disable the door releases of all other doors
Self-Closing
When a door must close on its own, with the assistance of closing hardware. Properly installed door closers or spring hinges will make a door self-closing. Self-closing doors are required for fire rated openings
Self-Latching Flush Bolt
A flush mounted locking device for the inactive leaf of a pair of doors that latches automatically and unlatches manually
Shank (of a knob)
The projecting stem of a knob into which the spindle is fastened
Shelf Pin
A pin for supporting a shelf; also called a shelf support or shelf rest
Shunt
Length of time that an input will be masked
Shutter Operator
A device incorporating a hinge and a method of opening or closing a shutter by means of a crank or turn from inside without opening window
Shutter Worker
See Shutter Operator
Side Knob Screw
A set screw used to fasten a knob to a spindle
Sidelite Frame
The same as a borrowed lite except that it is attached to a door frame
Sight Line
The continuation of various horizontal extrusions on a door and its adjoining walls
Signal Sash Fastener
A sash fastening device to lock double-hung windows that are beyond reach from the floor. It has a ring for a sash pole hook. When locked, the ring lever is down; when the ring lever is up, it signals by its upright position that the window is unlocked
Silencer
A rubber part attached to the stop on a frame to cushion the closing of a door
Sill (Frame)
The bottom horizontal piece of a borrowed lite or sidelite frame
Simultaneous Pair
Two swinging doors, side by side, in a common header, without a separator, that always operate together
Single Pole/Double Throw (SPDT)
A term used to describe a switch or relay contact form (1 form C) that has a normally open and a normally closed contact with a common connection
Single Pole/Single Throw (SPST)
A switch with only one moving and one stationary contact, available either normally open (NO) or normally closed (NC)
Single Acting Operator
An automatic door operator that moves in a single direction in the closed position and cannot move in the opposite direction
Smart Card
A type of access control card that stores information in a microchip. The chip not only stores data, but can perform computation and exchange data with the reader. It is read by touching the card to the reader so that the electrical contacts line up. See also contactless smart card
Smart Media
Small objects of any shape that contain the same type of chip used in a smart card. Smart media are typically small objects (tokens) that can be attached to a key ring or worn as jewelry
Social Engineering
The use of ordinary guile and deceit to con people into relaxing security procedures - for example, such as revealing passwords, lending keys, or opening doors
Soffitt
Portion of the frame between stops on a double rabbeted frame and the stop and the largest face on a single rabbeted frame
Solid-State Relay
A relay that is a solid-state switch rather than an electro-mechanical device. This type of relay requires power to perform its switching, and it has no moving parts
Spindle (of a knob)
The bar or tube connected with the knob or lever handle that passes through the hub of the lock or otherwise engages the mechanism to transmit the knob action to the bolt(s)
Split Astragal
An astragal that is split through the middle, allowing each door leaf to operate independently
Spreader Bar
Metal bars at base of welded frame to keep frame in alignment during assembly, transportation and handling - not to be used for installation
Spring Hinge
A hinge containing one or more springs to move the door into the de sired position. It may be either single or double acting
Spring Open - Power Close (S.O.P.C.)
A door that opens under spring tension and closes under power. Useful for smoke evacuation system applications
Steel Stud Anchor
A metal piece inside throat of frame used to secure frame to steel stud
Steel Window Frame
A four sided steel frame, which is glazed (has glass) but does not include a door. Also known as Borrowed Lite
Sticks
Linear lengths of frame sections used for fabrication of transom/sidelite frames
Stile (of a door)
A vertical member of the door structure; each door has two, a lock stile and a hinge stile
Stop (of a frame)
The part of frame against which door closes
Stop (of a lock)
The button, or other small device, that serves to lock the latch bolt against the outside knob or thumb piece or unlock it if locked. Another type holds the bolt retracted
Store Door Handle
A heavy grip or pull mounted on sectional or elongated plates and provided with a thumb piece to operate the latch trip of a store door lock
Storeroom Function
Entrance by knob or lever only when released by key. Key removable only when locked. BHMA function 09
Strap Hinge
A surface hinge of which one or both leaves are of considerable length
Strike
A metal plate or box that is pierced or recessed to receive the bolt or latch when projected
Strike Jamb
A vertical piece of a door frame prepared for installation of lock strike
Surface Applied
A door header that is applied to the wall or frame surface
Surface/Concealed
Mounted on exterior existing material/ mounted inside a wall/ header to be out of sight
Surface Hinge
One having both leaves surface applied
Swinging Latch Bolt
A bolt that is hinged to a lock front and is retracted with a swinging rather than a sliding action
Swing-side (sometimes called the Safety-side)
A term used to describe the side of a swinging door that encompasses the swing path
Switch, Maintained
A switch that, when activated, maintains its activated position until it is unactivated
Switch, momentary
A switch that, when activated, automatically returns to its original position afterwards
Swivel Spindle
A spindle having a joint midway in its length to permit the knob at one end to be made rigid by the stop works while the other end is free to operate
T Handle
A cross handle for actuating the bolt of a lock and used in place of a knob
T Hinge
A surface hinge with the short member attached to the jamb and the long member attached to the door
Tailgating
The security breach that occurs when an unauthorized person slips past a checkpoint undetected, by following an authorized user through an open door. (See also piggybacking)
Tamper
A digital input which monitors the status of a device, typically the door of an enclosure
Tamper Resistant Screws
A type of screw which is designed to make removal using standard tools extremely difficult. Some tamper resistant screws require special tools to install
Telescoping Slider
Two or more leaves slide in the same direction to arrive at the full open position at the same time
Tempered Glass
A type of safety glass that has been treated by heat or chemicals to increase its strength. If broken, the glass breaks into small fragments instead of large, jagged pieces
Template
In biometrics, a computed transformation of a scan - still unique to the individual but taking up much less storage. It is the template, not the raw scan, that is stored in a database of users or on the chip of a smart card, for comparison to a live scan taken at an access point
Template Hardware
A term indicating any item of hardware that is made to template; that is, exactly matching the master template drawing as to spacing of all holes and dimensions
Thimble
The socket or bearing attached to an escutcheon plate in which the end of the knob shank rotates
Three-Point Lock
A device sometimes required on three-hour fire doors to lock the active leaf of a pair of doors at three points
Threshold
A strip fastened to the floor beneath a door, usually required to cover the joint where two types of floor material meet
Threshold (Biometrics)
In biometrics, the user-adjustable parameter that can be used to adjust the two failure rates (false acceptance and false rejection). Since it represents “How close is close enough?” decreasing one of the failure rates automatically increases the other
Threshold Sensors
Presence sensors used to detect a person in the space between two non-overlapping zones in the threshold area
Throat (of a frame)
The opening between backbends of frame
Throw (of a deadbolt or latch bolt)
Measurement of the maximum projection when bolt is fully extended
Thumb Piece (of a handle)
The small pivoted part above the grip of a handle to be pressed by the thumb to operate a latch bolt
Time Schedules
Consists of time ranges that are associated with days of the week or holidays, and are often used with access levels or as trigger events
Timely Frame
Brand name of a prefinished steel door frame, for stud walls
Token
A small object with a microchip that carries your personal identifying information. The token is touched to a reader, or simply brought within range if it includes RFID capability
Transceiver
A term usually applied to the microwave transmitter/receiver module in a microwave motion sensor
Transducer
A term used to describe a device that emits energy. Usually an ultrasonic transmitter/receiver
Transformer
A device that can either reduce or increase electrical voltage. In the automatic door industry, it is usually used as a method to reduce voltage
Transistor
A three lead solid-state device used in electronics as either a switch or an amplifier. These can be low power units or high power units requiring heat sinks
Transom Bar
That part of a door frame that separates the top of a door or a window from the bottom of the transom
Transom Catch
A fastener applied to a transom and having a ring by which the latch bolt is retracted
Transom Chain
A short chain used to limit the opening of a transom; usually provided at each end with a plate for attachment
Transom Frame
A door frame having a panel, louver, sash or glass above door opening with or without transom bar
Transom Lift
A vertically operated device attached to a door frame and transom by which the transom may be opened or closed
Transom Panel
A panel installed in a frame above the door opening
Trigger
An event or manual action that will cause another event or execution of a macro
Trim
Trim is composed of both operating and non-operating decorative elements and includes knobs, levers, pulls, roses, escutcheons, lock fronts, strikes, actuating bars, turns, thumb pieces, vertical rods, cylinder assemblies, and covers
Tubular Lock (or Latch)
A type of bored lock
Tumbler
A guard or obstruction that pre vents operation of a bolt except by insertion of the proper key
Turn
The component that projects or releases a bolt or latch bolt by turning. Sometimes called a turnpiece
Turn Piece
A small knob, lever or tee turn with spindle attached for operating the deadbolt of a lock or a mortise bolt
Two-Point Latch
A device sometimes required on three-hour fire doors to lock the inactive leaf of a pair of doors at top and bottom
Undercut
The clearance between bottom offrame and bottom of door - The floor clearance may not be the same as the clearance between the bottom of the door and the finished floor - the floor clearance can only be determined after the finish material is in place
Unit Lock
See Preassembled Lock
Universal
A term used to describe a lock, a door closer or other device that can be used on doors of any hand without change
VA
An acronym for the term “Volt-Ampere.” This term is used to indicate the power capacity of a transformer. For example a 40 VA transformer can supply 40 VA of power without exceeding its capacity
Vertical Rod Exit Device
An exit device with top and bottom latching mechanism, applied to the face of the door or concealed inside the door connected by rods to the actuating mechanism. Vertical rod devices are permitted to be supplied without bottom latching mechanism. Vertical rod exit devices can be either Panic or Fire Exit Hardware
Vertical Spring Pivot Hinge
A spring hinge mortised into the heel of a door and fastened to the floor and head with pivots
Vicinity Card
An access control card that has an onboard RFID transmitter/receiver, allowing it to communicate with a reader from a distance of up to one meter (3 feet)
Vision Lite (Design V)
Design of door having one small view window in upper portion only, usually square design on vertical center line of door
Voice Print
In biometrics, a digital representation of a user’s voice used for comparison with the user’s live speech at an access point
Volt/Amp (VA) rating
The product of rated input voltage multiplied by the rated current. This establishes the "apparent energy" available to accomplish work
Voltage Drop
A term used to indicate reduction of voltage through a conductor over a specified distance
WAN
Wide area network
Ward
An obstruction projecting from the lock case of side of a keyhole intended to prevent entrance or rotation of an improperly cut key
Watt
The common unit of electrical power. One watt is dissipated by a resistance of one ohm through which one ampere flows
Wattage
A measure of power consumption
Wiegand Card
A type of access control card that uses embedded work-hardened wire (Wiegand wire) to hold information read by swiping it through a reader
Wire Glass
A type of glass that has a grid of mesh or thing metal wire embedded within the glass