Locksmith Glossary - F


Source: Lock Industry Standards and Training (LIST) Council

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.

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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