Glossary
Face-
(n.) The finished component of a lock visible on the edge of a door.
Face Cap-
(n.) A finished cover, that may retain a dust cover or serve as a plug retainer, affixed to the face of some lock cylinders.
Face Plate-
(n.) The finished, removable plate which covers the front of some locks.
Factory Original Key-
(n.) The out key furnished by the lock manufacturer for a lock or cylinder.
Fail-Safe-
(adj.) A feature of a security device designed to release, for safety purposes, during a power loss.
False Acceptance Rate-
(n.) In a biometric access control device, the number of incorrect submissions that can be accepted as correct, typically expressed as per cent, e.g. less than 0.0001%.
False Gate-
(n.) A gate in a part of the operating mechanism, which is not formed deeply enough to allow operation of the lock.
False Rejection Rate-
(n.) In a biometric access control device, the number of correct submissions that can be rejected as incorrect, typically expressed as per cent, e.g. less than 0.001%.
FAR-
(abb.) False Acceptance Rate
Feather Key-
(n.) A type of flat key used for the original Yale pin tumbler mortise locks.
Fence-
(n.) 1. A projection on a lock bolt which prevents movement of the bolt unless it can enter gates of properly aligned tumblers.
(n.) 2. Any locking element other than a sidebar or shackle designed to enter a tumbler's gate.
(n.) 3. A projection on the lever in a combination lock that prevents the lever from engaging the drive cam until the proper combination is entered.
See also: “sidebar”
File Cabinet Lock-
(n.) 1. Any lock used on a file cabinet.
(n.) 2. A plunger lock cylinder for a gang lock normally used in a file cabinet.
Fill Program-
(n.) A computer based code reference which determines all combinations in a code series that match a given partial combination.
Filler Plate-
(n.) A usually flat piece of material used to; cover a hole or opening, provide a foundation for mounting additional hardware, or adjust the position of hardware as mounted.
Fine Ward-
(n.) A ward made of sheet metal, typically installed as a bridge ward.
Finish-
(n.) A material, coloring and/or texturing specification.
Fire Alarm-
(n.) A system designed to detect and report conditions, which may indicate presence of a fire.
Fire Door-
(n.) A door constructed to provide a specific degree of fire protection.
Fire Door Assembly-
(n.) Any combination of a fire door, frame, hardware and other accessories, that together provides a specific degree of fire protection to the opening.
Fire Exit Hardware-
(n.) exit devices, which may legally be installed, on fire doors. Distinguished from other exit devices because it: 1. is labeled for both fire and panic and; 2. has no means of locking the latch in a retracted position.
Fire Separation-
(n.) Construction designed to limit the spread of fire in a structure.
Fireman’s Key-
(n.) A key used to override normal operation of elevators, bringing them to the ground floor.
First Generation Duplicate-
(n.) A key which was duplicated using a factory original key or a code original key as a pattern.
First Key-
(n.) Any key produced without the use of a pattern key.
Five Column Progression-
(n.) A process wherein key bittings are obtained by using the cut possibilities in five columns of the key bitting array.
Five Pin Master Key-
(n.) A master key for all combinations obtained by progressing five bitting positions.
Fixed Fly-
(n.) In a combination lock, a fly that does not move relative to the wheel it is on.
Fixed Pin Hand Change Wheel-
(n.) A combination wheel that uses pressed or threaded pins as a fixed fly.
Fixed Rise (Chamber)-
(n.) A plug and shell pin chamber design associated with fixed rise pins.
Fixed Rise (Pin)-
(adj.) Of or pertaining to a pin tumbler which is designed to operate properly only when its rotation capabilities are limited or precluded.
Fixed Tumbler-
(n.) A ward located within the tumbler pack.
Flat Goods-
(n.) Ancillary architectural hardware such as push plates, mop plates, stretcher plates, kick plates, etc.
Flat Steel Key-
(n.) A flat type key made of steel.
Flat Type Key-
(n.) A key which is completely flat on both sides, usually used for warded or lever tumbler locks.
Flexible Head Mortise Cylinder-
(n.) An adjustable mortise cylinder which can be extended against spring pressure to a slightly longer length.
Floor Closer-
(n.) A door closer installed below the door at the floor surface, generally also acting as a bottom pivot for the door.
Floor Master Key-
(n.) A master key which operates all or most master keyed locks on a particular floor of a building.
Floor Safe-
(n.) A security container designed for mounting below floor level with the top surface flush with the finished floor.
Flush Bolt-
(n.) A non-keyed deadbolt, with a one piece escutcheon/faceplate, typically mounted flush to door surfaces.
Flush Cup Pull-
(n.) A flush pull with a circular cross-section.
Flush Pull-
(n.) A recess in a door or drawer which serves as a handle or grip.
Flush Ring-
(n.) A ring, recessed into a door, which swings out to serve as a handle.
Fly-
(n.) The part of a combination wheel pack or a drive cam that makes contact with a similar part on an adjacent wheel in the wheel pack and causes it to turn.
Fly Stop-
(n.) The part of a combination lock wheel that restricts the motion of a movable fly.
Foot-
(n.) The cam portion of the trunnion assembly in some lever tumbler locks.
Foot Bolt-
(n.) A bolt mechanism typically mounted at the bottom of a door, and designed to be easily operated by ones foot.
Forbidden Zone-
(n.) On a combination lock dial, a range of marks within which the last item of the combination must not be set to provide for proper lock operation.
Fork Lock-
(n.) A motorcycle or bicycle lock which prevents the front fork from rotating.
Four Column Progression-
(n.) A process wherein key bittings are obtained by using the cut possibilities in four columns of the key bitting array.
Four Pin Master Key-
(n.) A master key for all combinations obtained by progressing four bitting positions.
Frangible Shackle-
(n.) A padlock shackle designed to be broken easily.
Frangible Shackle Padlock-
(n.) A padlock equipped with an easily broken shackle.
Frangible Tumbler-
(n.) A tumbler whose reference size may be permanently altered, or established, mechanically without removal from the cylinder.
French Doors-
(n.) A set of double doors composed of many small glass panes and narrow stiles.
Friction Catch-
(n.) A door or cabinet latching device which contains no actuator and is released by applying a measure of force in the opening direction.
Friction Fence-
(n.) A pivoting combination lock fence that is usually mounted loosely to a rotatable member that positions the fence to test the cam and wheels for alignment at drop in when the rotatable member is turned in the correct direction.
Friction Hinge-
(n.) A device with torque resistance between two parts on a common axis.
Frictioned Plug-
(n.) A type of clutch system permitting both sides of a double profile cylinder to operate the lock regardless of whether the opposite plug is turned.
Front-
(n.) The portion of a lock which provides the means of mounting the locking device to the edge of the door.
Front Drive-
(adj.) Of or pertaining to a combination lock with the drive cam located between the dial and the wheel pack.
Front Reading (Dial)-
(adj.) A safe dial that has graduations on the face.
FRR-
(abb.) False Rejection Rate
Full Lip Strike-
(n.) A strike plate for a latch with the lip extending the full height of the strike.
Full Mortise-
(adj.) Pertaining to a method of installation in which only the faceplate and trim is exposed. The lock case is installed in a pocket in the door or drawer (v.) to make a rectangular pocket in a door or drawer that is only open on the edge of the door or drawer.
Full Mortise Hinge-
(n.) A type of hinge designed for mortising into the edge of the door and into the rabbet of a door frame.
Function-
(n.) A set of operating features for a particular type of lock or exit device which make it suitable for a specific application. The function is designated by a classification name or standards reference number. See ANSI or BHMA for a specific listing.
Fusible Link-
(n.) A relock trigger activated by heat.
Fusible Link Arm-
(n.) A door closer arm which includes a mechanism for holding a door open. This mechanism has an element which, when subjected to certain temperatures, melts and allows the door to close.
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