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160 prep

a standard door preparation which consists of a 2-1/8" cross-bore with a 2-3/8" backset, and a 1" edge-bore with a mortise 1" wide and 2- 1/4" high.

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161 prep

a standard door preparation which consists of a 2- 1/8" cross-bore with a 2-3/4" backset and a 1.

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A

Accessory position

the position of an ignition switch intended to permit the use of radio or other equipment without turning on a drive chain component.

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Active leaf

the single door of a pair where the active or locking hardware is mounted.

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Actuator

a device usually connected to a cylinder. When activated may cause a lock mechanism to operate.

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ADA

Americans with Disabilities Act

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Adjustable mortise cylinder

any mortise cylinder whose length can be adjusted for a better fit in doors of varying thickness.

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AFTE

Association of Firearm and Toolmark Examiners.

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After hours depository

a locked receptacle for the deposit of items after regular hours.

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AHC

Architectural Hardware Consultant (as certified by DHI).

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AHD

after hours depository.

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AHJ

authority having jurisdiction.

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Alarm system

a system of electrical and/or electronic components which detect and report dangers, such as fire or intrusion.

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Aligning tube

a lock component which orients and joins the latch and knob spindles of certain bored locksets. In some combination locks, a tube which houses the spindle, located between the dial ring and the lock.

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All-section key blank

the key section which enters all keyways of a multiplex key system.

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ALOA

Associated Locksmiths of America.

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Americans with Disabilities Act

a US federal law dealing with minimum standards of building accessibility, as well as other issues concerning individuals with disabilities.

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Angularly bitted key

a key which has perpendicular cuts made into the blade at various degrees of rotation.

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ANSI

American National Standards Institute

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ANSI 117.1

the section of the American National Standards Institute document pertaining to handicap access.

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ANSI strike

strikes designed to fit door and frame preparations as specified in the applicable document in the ANSI Al 15 series. Common usage refers to a strike with dimensions of 4-7/8" X 1-1/4".

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Anti-friction

pertaining to a feature which, upon contact with the strike, allows smoother operation of a latch bolt.

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Architectural hardware

hardware used in building construction, especially those used in connection with doors.

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ASIS

American Society for Industrial Security.

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Assembly occupancy

buildings or areas which are designated as places of assembly according to life safety and building codes.

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Associated change key

a change key which is directly related to particular master key through the use of constant cuts.

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Associated master key

a master key which has particular change keys related directly to its combination through the use of constant cuts.

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ASTM

American Society for Testing and Materials.

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Astragal

a molding attached to the face of the active leaf of a pair of doors which overlaps the inactive leaf.

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ATM

automatic teller machine.

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ATT

symbol for attendant's key.

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Attendant's key

a selective master key used in a hospital keying system.

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Authority having jurisdiction

the person, usually within a municipality, charged with the application and interpretation of local life safety codes.

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Automatic deadbolt

a deadbolt designed to extend itself fully when the door is closed.

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Automatic flush bolt

a flush bolt designed to extend itself when both leaves of the pair of doors are in the closed position.

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Automatic teller machine

a device for dispensing cash, receiving deposits and performing other banking functions upon presentation of the proper authorization.

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Auxiliary lock

any lock installed in addition to the primary lockset.

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B

Back plate

a thin piece of metal, usually with a concave portion. Used with machine screws to fasten certain types of cylinders to a door.

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Backcheck

the resistance provided by a door closer as a door is opened.

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Backset

the distance between the center of a cross-bore and the bolt edge of a door or drawer.

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Ball Bearing

a metal ball, usually made of steel, used in the pin stack to accomplish some types of hotel or construction keying. May be used by some lock manufacturers as the bottom element in the pin stack in one or more pin chambers. Any metal ball used as a tumbler's primary component.

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Ball locking

a method of locking a padlock shackle into its case using ball bearings as the bolts.

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Barrel bolt

a surface mounted slide bolt which has a cylindrical shape.

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Barren, Robert

the Englishman credited with the invention of the double-acting lever tumbler in 1778

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Barrier free

having to do with the absence of access restrictions for the handicapped.

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Basic Building Code

former name for BOCA National Building Code.

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Battery eliminator

an electric device designed to provide energy to equipment normally requiring batteries for operation.

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Bell Box

the protective enclosure for a bell or other alarm sounding device.

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Bell type key

a key whose cuts are in the form of wavy grooves milled into the flat sides of the key blade. The grooves usually run the entire length of the blade.

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Bevel (of a door)

the pitch on the leading edge of a door which allows clearance for closing.

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Bezel

a threaded collar commonly used to secure certain cylinder or lock assemblies.

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BHMA

Builders Hardware Manufacturers Association.

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Bi-directional cylinder

a cylinder which may be operated in a clockwise and counterclockwise direction by a single key.

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Bible

that portion of the cylinder shell which normally houses the pin chambers, especially those of a key-in-knob cylinder or certain rim cylinders.

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Bicentric cylinder

a cylinder which has two independent plugs, usually with different keyways. Both plugs are operable from the same face of the cylinder. It is designed for use in extensive master key systems.

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Bicycle padlock

a padlock with sufficient shackle clearance to secure a bicycle.

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Binary cut key

a key whose combination only allows for two possibilities in each bitting position: cut or no cut.

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Binary type cylinder or lock

a cylinder or lock whose combination only allows for two bitting possibilities in each bitting position.

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Bit

the part of the key which serves as the blade, usually for use in a warded or lever tumbler lock. May also mean to cut a key.

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Bit key

a key with one or more projecting bits.

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Bitting

the numbers which represent the dimensions of the key cuts. 2. the actual cut(s) or combination of a key

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Bitting depth

the length of a cut that is made into the blade of a key.

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Bitting list

a listing of all the key combinations used within a system. The combinations are usually arranged in order of the blind code, direct code, and/or key symbol.

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Bitting position

the location of a key cut.

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Blade

the portion of a key which may contain the cuts and/or milling.

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Blank

an uncut key.

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Blind code

a designation, unrelated to the bitting, assigned to a particular key combination for future reference when additional keys or cylinders may be needed.

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Block master key

the one pin master key for all combinations listed as a block in the standard progression format.

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BOCA

Building Officials and Code Administration International

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BOCA National Building Code

the model building code developed and published by BOCA.

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Bolt

any movable projection which blocks the movement of one object relative to another.

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Boltwork button

the component which automatically triggers extension of the locking bolt when the door is in the closed position.

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Bored lock

a lock for a door prepared with one or more cross-bores and one or more edge-bores.

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Boring jig

a tool, temporarily affixed to a door, which provides a template structure to guide drill bits properly when preparing for the installation of specific hardware.

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Bottom of blade

the portion of the blade opposite the cut edge of a single bitted key.

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Bottom pin

usually a cylindrical shaped tumbler which may be conical, ball shaped or chisel pointed on the end which makes contact with the key.

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Bow

the portion of the key which serves as a grip or handle.

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Bow stop

a type of stop located near the key bow.

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Box of wards

a complete unit of intricate wards installed in or on a lock case.

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Box strike

a strike equipped to line the bolt cavity for both aesthetic and protective purposes.

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Bramah type lock

a lock or cylinder using a mechanism with sliders, normally arranged in a circle.

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Bramah, Joseph

the Englishman who had the world's first patent of a locking mechanism in 1784. It was the first lock incorporating a cylinder whose key did not contact the lock bolt directly.

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Bridge ward

a center ward attached to the interior of a lock by means of a bracket.

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Broach

a tool used to cut the keyway into the cylinder plug. Also the act of cutting the keyway into a cylinder plug with a broach.

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Build-up dimension

the distance between two different shear lines, as expressed in units of the manufacturer's increment or as an actual measurement. The dimension of the buildup pin required in a particular chamber which will allow one key to operate at the plug shear line and a different key to operate at a different shear line.

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Build-up pin

the additional element of a pin stack required to allow operation at different shear lines in a cylinder.

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Building master key

a master key which operates all or most master keyed locks in a given building.

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By-pass tool

a device that neutralizes the security of a locking device or its application hardware, often taking advantage of a design weakness.

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Bypass key

the key which operates a key override cylinder.

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C

Cam

a lock or cylinder component which transfers the rotational motion of a key or cylinder plug to the bolt works of a lock. The bolt of a cam lock.

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Cam lock

a complete locking assembly in the form of a cylinder whose cam is the actual locking bolt.

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Cap

a spring cover for a single pin chamber. A part which may serve as a plug retainer and/or a holder for the tailpiece. Also the act of installing a cap.

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Capping block

a holding fixture for certain interchangeable cores which aids in the installation of the caps.

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Card reader

a device which interprets the coding resident on cards.

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Case

the housing or body of a lock.

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Case cap

the scalp of an automotive cylinder.

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Case cover

the portion of a lock case which is designed to be removable to allow access to the mechanism.

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Case ward

any ward directly attached to or projecting from a lock case.

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Central station

a location designed for the sole purpose of processing status signals for multiple alarm systems.

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Certificate of occupancy

a document granted by an authority having jurisdiction, permitting occupancy or use.

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Chamber

any cavity in a cylinder plug and/or shell which houses the tumblers.

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Change index

the point on a key changeable combination lock dial ring to which the old and new combinations must be dialed when changing the combination.

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Change key

a key which operates only one cylinder or one group of keyed alike cylinders in a keying system.

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Changeable bit key

a key which can be recombinated by exchanging and/or rearranging portions of its bit or blade.

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Chubb shackle

a hinged shackle with a pierced hole for the bolt in its movable end.

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CK

change key or control key.

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Claw bolt

a bolt with one or more fingers which extend out of the bolt and lock behind the strike as the bolt reaches the locked position.

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Clear opening

a portal providing clearance through which passage is unhampered.

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Clevis

a device to permanently attach a chain to a padlock.

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Clipper

a hand held key bitting punch, often incorporating a trigger-like handle.

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Closed gated

pertaining to a lever tumbler whose gate is pierced into the body of the tumbler. The lever surrounds the fence in both the locked and unlocked positions.

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Closed knob

a knob without an opening in its face.

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Closet latch

a latchset which has a turning device with minimum projection in place of the inside knob or lever.

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Closet spindle

a spindle with a thumbturn attached to one end.

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Clutch

the part of a profile cylinder that transfers rotational motion from the inside or outside element to a common cam or an actuator.

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CMK'd

construction master keyed.

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CML

the title " Certified Master Locksmith" as awarded by ALOA.

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CO

certificate of occupancy.

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Code

a designation assigned to a particular key combination for reference when additional keys or cylinders may be needed.

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Code key

a key cut to a specific code rather than duplicated from a pattern key. It may or may not conform to the lock manufacturer's specifications.

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Code original key

a code key which conforms to the lock manufacturer's specifications.

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Combinate

to set a combination in a lock, cylinder, or key.

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Combination

the group of numbers which represent the billing of a key and/or the tumblers of a lock or cylinder.

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Combination wafer

a type of disc tumbler used in certain binary type disc tumbler key-in-knob locks. Its presence requires that a cut be made in the position of the operating keys.

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Compensate drivers

to select longer or shorter top pins, depending on the length of the rest of the pin stack, in order to achieve a uniform pin stack height.

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Complementary keyway

usually a disc tumbler keyway used in master keying. It accepts keys of different sections whose blades contact different bearing surfaces of the tumblers.

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Composite keyway

a keyway which has been enlarged to accept more than one key section, often key sections of more than one manufacturer.

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Compound bitted key

a key with at least one compound cut.

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Compound cut

a bitting which has another bitting dimension within its dimensions.

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Concealed shell cylinder

a specially constructed (usually mortise) cylinder. Only the plug face is visible when the lock trim is in place.

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Concealed vertical rod device

a vertical rod exit device whose rods and header/threshold bolts are concealed within the door.

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Concrete case

an enclosure for mounting a floor closer.

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Constant cut

Any bittings that are identical in corresponding positions from one key to another in a keying system. They usually group these keys together within a given level of keying, and/or link them with keys of other levels.

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Construction breakout key

a key used by some manufacturers to render all construction master keys permanently inoperative.

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Construction core

an interchangeable or removable core designed for use during the construction phase of a building. The cores are normally keyed alike and upon completion of construction, they are to be replaced by the permanent system's cores.

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Construction master key

a key normally used by construction personnel for a temporary period during building construction. It may be rendered permanently inoperative without disassembling the cylinder.

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Construction master keyed

of or pertaining to a cylinder which is or is to be operated temporarily by a construction master key.

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Continuous duty

designed to sustain application of power for extended periods.

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Control chamber

in an interchangeable or removable core, any chamber which has a control shear line which is different from the operating shear line.

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Control cut

any bitting which operates the retaining device of an interchangeable or removable core.

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Control dimension

in certain interchangeable or removable cores, the distance between the operating shear line and the control shear line. Expressed either in units of the increment or as a measurement.

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Control key

a key whose only purpose is to remove and/or install an interchangeable or removable core. A bypass key used to operate and/or reset some combination type locks. Also a key which allows disassembly of some removable cylinder locks.

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Control lug

the part of an interchangeable or removable core retaining device which locks the core into its housing.

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Control shear line

the shear line which allows operation of the control lug of an interchangeable or removable core.

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Control sleeve

the part of an interchangeable or removable core retaining device which surrounds the plug.

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Controlled cross keying

a condition in which two or more different keys of the same level of keying and under the same higher level keys operate one cylinder by design; e.g., XAAI operated by AA2 (but not XAAl operated by Al:H) NOTE: This condition could severely limit the security of the cylinder and the maximum expansion of the system when more than a few of these different keys operate a cylinder, or more than a few cross keyed cylinders per system are required.

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Coordinator

in conjunction with a pair of doors, a device designed to cause the inactive leaf to close first.

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Core

a complete unit, often with a figure 8 shape, which usually consists of the plug, shell, tumblers, springs, plug retainer and spring covers. It is primarily used in removable and interchangeable core cylinders and locks.

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Corner bracket

a door closer mounting plate attached to the upper corner of the jamb

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CPL

the title "Certified Professional Locksmith" as awarded by ALOA.

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CPP

the title "Certified Protection Professional" as awarded by ASIS.

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CRL

the title "Certified Registered Locksmith" as awarded by ALOA.

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Cross keying

the deliberate process of combinating a cylinder (usually in a master key system) to two or more different keys which would not normally be expected to operate it together.

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Cross-bore

a hole drilled into the face of a door where a bored or interconnected lockset will be installed.

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Cruciform

of or pertaining to a key section or keyway which usually resembles a plus sign (+) or the letter "X".

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CSI

Construction Specifiers Institute.

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Curved lip strike

a strike so shaped as to effect smoother function of the latch while the door is closing.

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Cut angle

a measurement usually expressed in degrees for the angle between the two sides of a key cut.

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D

Disc tumbler

a flat tumbler which must be drawn into the cylinder plug by the proper key so that none of its extremities extends into the shell. A flat, usually rectangular tumbler with a gate which must be aligned with a sidebar by the proper key.

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Display key

a special change key in a hotel master key system which will allow access to one designated guest room, even if the lock is in the shut out mode. It may also act as a shut out key for that room.

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Dog

to place an exit device in the hold-back mode. In marine applications the latch for a hatch.

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Dogging cylinder

a key operated cylinder used to dog an exit device.

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Dogging key

a key or tool used to dog an exit device.

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Dogging screw

a screw used to dog an exit device.

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Door control

any device which controls the opening, closing or position of a door.

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Door silencer

a bumper installed in the jamb stop to quiet the closing of a door.

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Double acting hinge

a hinge which permits movement of a door in either direction from the closed position.

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Double bitted key

a key bitted on two opposite surfaces.

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Double cylinder

pertaining to a lock with two keyed cylinders.

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Double cylinder deadlock

a deadbolt lock whose bolt may be operated by a key from either side.

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Double pin

to place more than one master pin in a single pin chamber.

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Double-acting lever tumbler

must be lifted a precise amount, neither too little nor too much to allow movement of a bolt.

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Double-D

a shape consisting of two opposing arcs and two opposing flats.

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Double-D punch

a tool used to make a double-D hole.

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Drilled key

a type of bit key with a hole drilled into the shank from the tip.

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Drive-in

pertaining to a latch or bolt with a round face.

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Driver spring

a spring placed on top of the pin stack to exert pressure on the pin tumblers.

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Drop

a pivoting or swinging dust cover.

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Drop bolt

a lock with an interlocking bolt which moves vertically and may enter loops on the strike.

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Dual custody

a function that requires the presence of two persons with two different keys, combinations or codes to operate the same device.

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Dummy cylinder

a non-functional facsimile of a rim or mortise cylinder used for appearance only, usually to conceal a cylinder hole.

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Dummy trim

non-active trim applied for aesthetic purposes.

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Duplicate

to copy.

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Duplicate key

any key reproduced from a pattern key.

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Duress code

a special combination or operation sequence which conveys an alarm or other signal to a remote location while allowing access.

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Dust box

an enclosure applied under a strike to enhance appearance and/or performance.

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Dust cover

a device designed to prevent foreign matter from entering a mechanism through the keyway.

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Dustproof cylinder

a cylinder designed to prevent foreign matter from entering either end of the keyway.

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E

Edge-bore

a hole drilled into the edge of a door where a bored or interconnected lockset is to be installed.

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Educational occupancy

those buildings or areas which are designated as places for education purposes according to life safety or building codes.

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Effective plug diameter

the dimension obtained by adding the root depth of a key cut to the length of its corresponding bottom pin which establishes a perfect shear line. Won't necessarily be the same as the actual plug diameter.

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Effective throw

the distance a deadlatch remains projected when the guard bolt has been engaged and end pressure is applied to the latch.

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Ejector hole

a hole found on the bottom of certain interchangeable cores under each pin chamber. It provides a path for the ejector pin.

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Ejector pin

a tool used to drive all the elements of a pin chamber out of certain interchangeable cores.

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Electrified lockset

a lock which is controlled electrically.

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Emergency key

the key which operates a privacy function lockset.

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Emergency master key

a special master key which usually operates all guest room locks in a hotel master key system at all times, even in the shut out mode. This key may also act as a shut out key.

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EMK

emergency master key.

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End ward

a ward which prevents complete insertion and/or rotation of an incorrect key by forming an obstruction at the end of the key.

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End ward cut

any cut made into a key to bypass an end ward.

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ENG

symbol for engineer's key.

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Engineer's key

a selective master key which is used by maintenance personnel to operate many locks under different master keys in a system of three or more levels of keying.

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Entry/exit delay

an alarm or access control feature which allows a specific time lapse between the activation of a switch and the activation of a secondary component.

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Escutcheon

a surface mounted trim which enhances the appearance and/or security of a lock installation.

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Exit only

refers to hardware designed to secure an opening in such a way as to permit exit at all times but prevent entry at all times.

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Extractor key

a tool which normally removes a portion of a two-piece key or blocking device from a keyway.

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F

Face

the finished component of a lock visible on the edge of a door.

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Face plate

the finished, removable plate which covers the front of some locks.

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Factory original key

the cut key furnished by the lock manufacturer for a lock or cylinder.

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Fail safe

a feature of a security device designed to release, for safety purposes, during a power loss.

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Fence

a projection on a lock bolt which prevents movement of the bolt unless it can enter gates of properly aligned tumblers. Also any locking element other than a sidebar or shackle designed to enter a tumbler's gate.

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File cabinet lock

any lock used on a file cabinet. Also a plunger lock cylinder for a gang lock normally used in a file cabinet.

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Finish

a material, coloring and/or textural specification.

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Fire alarm

a system designed to detect and report conditions which may indicate presence of a fire.

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Fire door

a door constructed to provide a specific degree of fire protection.

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Fire door assembly

any combination of a fire door, frame, hardware and other accessories, that together provide a specific degree of fire protection to the opening.

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Fire exit hardware

exit devices which may legally be installed on fire doors. Distinguished from other exit devices because it is labeled for both fire and panic and has no means of locking the latch in a retracted position.

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Fireman's key

a key used to override normal operation of elevators, bringing them to the ground floor.

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First generation duplicate

a key which was duplicated using a factory original key or a code original key as a pattern.

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First key

any key produced without the use of a pattern key.

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Five column progression

a process wherein key bittings are obtained by using the cut possibilities in five columns of the key bitting array.

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Five pin master key

a master key for all combinations obtained by progressing five bitting positions.

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Flat goods

ancillary architectural hardware such as push plates, mop plates, stretcher plates, kick plates, etc.

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Flat type key

a key which is completely flat on both sides, usually used for warded or lever tumbler locks.

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Flexible head mortise cylinder

an adjustable mortise cylinder which can be extended against spring pressure to a slightly longer length.

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Floor master key

a master key which operates all or most master keyed locks on a particular floor of a building.

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Foot

the cam portion of the trunnion assembly in some lever tumbler locks.

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Four column progression

a process wherein key bittings are obtained by using the cut possibilities in four columns of the key bitting array.

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Four pin master key

a master key for all combinations obtained by progressing four bitting positions.

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Frangible shackle

a padlock shackle designed to be broken easily.

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Frangible shackle padlock

a padlock equipped with an easily broken shackle.

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Front

the portion of a lock which provides the means for mounting the locking device to the edge of the door.

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Full mortise

pertaining to a method of installation in which only the face plate and trim is exposed. The lock case is installed in a pocket in the door or drawer. To make a rectangular pocket in a door or drawer that is only open on the edge of the door or drawer.

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Fusible link arm

a door closer arm which includes a mechanism for holding a door open. This mechanism has an element that when subjected to certain temperatures, melts and allows the door to close.

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G

Gang lock

a locking mechanism with multiple bolts which locks different openings simultaneously by a single action.

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Garage door lock

a rim lock mechanism designed for use on an overhead door, has a spring loaded bolt which automatically locks the door's bolt mechanism.

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Gate

a notch cut into the edge of a tumbler to accept a fence or sidebar.

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GGGMK

great great grand master key.

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GGGMK'd

great great grand master keyed.

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GGM

great grand master key.

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GGMK

great grand master key.

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GGMK'd

great grand master keyed.

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GM

grand master key.

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GMK

grand master key.

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GMK section

grand master key section.

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GMK'd

grand master key.

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Graduated drivers

a set of top pins of different lengths. Usage is based on the height of the rest of the pin stack in order to achieve a uniform pin stack height.

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Grand master key

the key which operates two or more separate groups of locks, which are each operated by a different master key.

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Grand master key system

a master key system which has exactly three levels of keying.

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Grand master keyed

of or pertaining to a lock or cylinder which is or is to be keyed into a grand master key system.

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Graphite gun

a usually flexible container designed to dispense a powdered lubricant.

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Great grand master key

the key which operates two or more separate groups of locks which are each operated by a different grand master key.

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Great grand master key system

a master key system which has exactly four levels of keying.

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Great grand master keyed

of or pertaining to a lock or cylinder which is or is to be keyed into a great grand master key system.

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Great great grand master key

the key which operates two or more separate groups of locks which are each operated by different great grand master keys.

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Great great grand master key system

a master key system which has five or more levels of keying.

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Great great grand master keyed

of or pertaining to a lock or cylinder which is or is to be keyed into a great great grand master key system.

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Guard bolt

a spring loaded bolt which, when activated, will deadlock a latch bolt.

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Guard key

a key which must be used in conjunction with a renter's key to unlock a safe deposit lock. It is usually the same for every lock within an installation.

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Guest key

a key in a hotel master key system which is normally used to unlock only the one guest room for which it was intended, but will not operate the lock in the shut out mode.

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Guide

part of a key machine which follows the cuts of a pattern key or template during duplication. Or part of a flat key lever lock which connects the nose to the foot and supports the key blade.

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H

Half-mortise hinge

a hinge which has one leaf mortised into the door and the second leaf attached to the surface of the frame.

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Hand change

pertaining to a combination lock in which the wheels must be removed in order to change the combination

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Handed

pertaining to hardware which is manufactured only for application on doors with a specific orientation.

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Handicapped code

any building code designed to ease access for handicapped persons.

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Hard wire system

a system in which the components are directly connected to the central control unit.

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Hardware schedule

a listing of the door hardware used on a particular job. It includes the types of hardware, manufacturers, locations, finishes, and sizes. It should include a keying schedule specifying how each locking device is to be keyed.

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Hasp

a hinged metal strap designed to be passed over a staple and secured in place.

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Heel (of a padlock shackle)

the part of a padlock shackle which is retained in the case when in the unlocked position.

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Heel and toe locking

describes a padlock which has locking dogs at both the heel and toe of the shackle.

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HGM

horizontal group master key.

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High security cylinder

a cylinder which offers a greater degree of resistance to any or all of the following: picking, impressioning, key duplication, drilling or other forms of forcible entry.

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High security key

a key for a high security cylinder.

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Hinge security stud

a protrusion on one leaf of a hinge which interlocks with the other when the door is closed.

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Hinge stile

the vertical edge of a door where hinges are installed.

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Hinged shackle

a shackle whose heel is permanently mounted to the padlock case in a manner which allows the shackle to pivot open.

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HKP

housekeeper's key.

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Hobbs shackle

a hinged shackle with a notch for the bolt in its movable end.

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Hold open arm

a door closer arm with the capability of maintaining the door in the open position.

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Hold open cylinder

a cylinder provided with a special cam which will hold a latch bolt in the retracted position when set that way by the key.

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Holding fixture

a device which holds cylinder plugs, cylinders, housings, and/or cores to facilitate the installation of tumblers, springs and/or spring covers.

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Hollow driver

a top pin hollowed out on one end to receive the spring, typically used in cylinders with extremely limited clearance in the pin chambers.

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Hook bolt

a lock bolt shaped in the general outline of a hook. Normally used on sliding doors or where the spreading of the frame and door is open to a possible attack.

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Horizontal exit

an exit to the outside of an area of refuge on the same or nearly the same level.

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Horizontal group master key

the two pin master key for all combinations listed in all blocks in a line across the page in the standard progression format.

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Horizontal locking

the locking mechanism associated with vehicle doors with horizontal linkage.

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Horn

in a non-cylinder lock, the housing which surrounds the nose and extends through the door or drawer.

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Horn plate

the cover of a lever tumbler lock case to which the horn is attached.

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Hospital hinge

a hinge with a large chamber at each end of the knuckle.

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Housekeeper's key

a selective master key in a hotel master key system which may operate all guest and linen rooms and other housekeeping areas.

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Housing

that part of a locking device which is designed to hold a core.

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Hub

a lock component which redirects rotational motion from a spindle or shaft to linear movement of a latch or bolt.

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Hybrid locking system

a locking system which derives its security from two or more different technologies operated by the same key in one device, e.g. mechanical/electronic, mechanical, magnetic, etc.

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I

ICBO

International Conference of Building Officials.

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Ignition key release

a button or other actuator which must be pushed before a vehicle's ignition key may be turned to the withdrawal position.

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Ignition lock

the lock assembly associated with a vehicle's engine on-off switch and starter.

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Impression

the mark made by a tumbler on its key cut or to fit a key by the impression technique.

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Impression technique

a means of fitting a key directly to a locked cylinder by manipulating a blank in the keyway and cutting the blank where the tumblers have made marks.

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Incidental master key

a key cut to an unplanned shearline created when the cylinder is combinated to the top master key and a change key.

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Increment

a usually uniform increase or decrease in the successive depths of a key way which must be matched by a corresponding change in the tumblers.

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Index (of a combination lock dial)

the mark outside the dial ring or a combination lock used as a reference point.

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Indicator

a device which provides visual evidence that a deadbolt is extended or that a lock is in the shut out mode.

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Individual key

an operating key for a lock or cylinder which is not part of a keying system.

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Interchangeable core

a key removable core which can be used in all or most of the core manufacturer's product line. No tools (other than the control key) are required for removal of the core.

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Interconnected lockset

a lockset whose trim provides a means of simultaneous retraction of two or more bolts which may also be operated independently.

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Interlocking bolt

a bolt which interlocks with its strike when fully engaged.

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Interlocking pin tumbler

a type of pin tumbler which is designed to be linked together with all other tumblers in its chamber when the cylinder plug is in the locked position.

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Intermittent duty

of or pertaining to an electric strike or lock not designed to be energized for extended periods of time.

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IR

infrared.

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J

Jamb

the vertical components of a door frame.

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Jimmy proof

pertaining to a lock having a bolt which interlocks with its strike.

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Jumbo cylinder

a rim or mortise cylinder of a 1-1/2" diameter.

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K

K

symbol for "keys" used after a numerical designation of the quantity of the keys requested to be supplied with the cylinders; e.g. I K, 2K, 3K, etc. It is usually found in hardware/keying schedules.

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KA

keyed alike.

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KA/2, KA/3, etc

symbol used to indicate the quantity of locks or cylinders in keyed alike groups. These groups are usually formed from a larger quantity; e.g., 30 cylinders KA/2.

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KA1, KA2, etc

symbol which indicates that all cylinders designated are or are to be operated by the same keys. The numerical designation indicates the keyed alike group or set.

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KBA

key bitting array.

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KD

keyed different.

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Keeper

the movable portion of an electric strike which captures the bolt.

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Key

a properly combinated device which is, or most closely resembles, the device specifically intended by the lock manufacturer to operate the corresponding lock.

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Key bitting array

a matrix (graphic) display of all possible bittings for change keys and master keys as related to the top master key.

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Key bitting punch

a manually operated device which stamps or punches the cuts into the key blade, rather than grinding or milling them.

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Key bitting specifications

the technical data required to bit a given (family of) key blanks to the lock manufacturer's dimensions.

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Key blank

any material manufactured to the proper size and configuration which allows its entry into the keyway or a specific locking device. A key blank has not yet been combinated or cut.

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Key change

referring to a lock in which the combination can he changed through the use of a special key or tool without disassembling the lock.

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Key changeable

of or pertaining to a lock or cylinder which can be recombinated without disassembly, by the use of a key. The use of a tool may also be required.

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Key coding machine

a key machine designed for the production of code keys. It may or may not also serve as a duplicating machine.

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Key control

any method or procedure which limits unauthorized acquisition of a key and/or controls distribution of authorized keys. A systematic organization of keys and key records.

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Key cut profile

the shape of a key cut, including the cut angle and the cut root shape.

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Key cuts

the portion of the key blade which remains after being cut and which aligns the tumblers.

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Key duplicating machine

a key machine which is designed to make copies from a pattern key.

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Key gauge

a usually flat device with a cutaway portion indexed with a given set of depth or spacing specifications. It is used to help determine the combination of a key.

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Key interchange

an undesirable condition, usually in a master key system, where a key unintentionally operates a cylinder or lock.

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Key machine

any machine designed to cut keys.

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Key manipulation

manipulation of an incorrect key in order to operate a lock or cylinder.

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Key milling

the grooves machined in to the length of the key blade to allow its entry into the keyway.

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Key override

a provision allowing interruption or circumvention of normal operation of a combination lock or electrical device. Of or pertaining to such a provision, as in "key override cylinder" key.

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Key override cylinder

a lock cylinder installed in a device to provide override function.

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Key pull position

any position of the cylinder plug at which the key can be removed.

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Key pulls

a lock specification which indicates by quantity and orientation the positions in which a key may be withdrawn.

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Key records

records which typically include some or all of the following: bitting list, key bitting array, key system schematic, end user, number of keys/cylinders issued, names of persons to whom keys were issued, hardware/keying schedule.

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Key Records Department

the department which is responsible for generating and issuing all lock and key combinations and maintaining records of them.

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Key retaining

of or pertaining to a lock which must be locked before its key can be removed. Pertaining to a cylinder or lock which may prevent removal of a key without the use of an additional key and/or tool.

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Key section

the exact cross sectional configuration of a key blade as viewed from the bow toward the tip.

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Key switch

a switch operated by a keyed lock mechanism which may be an integral part of the switch assembly.

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Key symbol

a designation used for a key combination in the standard key coding system, e.g. A, AA, AAI, etc.

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Key system schematic

a drawing with blocks utilizing keying symbols, usually illustrating the hierarchy of all keys within a master key system. It indicates the structure and total expansion of the system.

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Key trap core/cylinder

a special core or cylinder designed to capture any key to which it is combinated, once that key is inserted and turned slightly.

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Key-in-knob cylinder

a cylinder used in a key-in-knob lockset.

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Key-in-knob lockset

any lockset with a key operated cylinder in one or more knobs.

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Key-in-lever lockset

any lockset with a key operated cylinder in one or more lever handles.

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Keyed

combinated or having provision for operation by key.

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Keyed alike

of or pertaining to two or more locks or cylinders, each of which is or is to be combinated differently from the others. They may or may not be part of a keying system.

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Keyed different

of or pertaining to a group of locks or cylinders, each of which is or is to be combinated differently from the others. They may or may nor be part of a locking system.

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Keyed random

of or pertaining to a cylinder or group of cylinders selected from a limited inventory of different key changes. Duplicate billings may occur.

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Keyhole

the opening through which a non-cylinder key must pass to enter a lock.

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Keyhole lock

a lock which blocks the keyhole of a bit key lock.

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Keyhole plate

an escutcheon for a keyhole keying.

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Keying

any specification for how a cylinder or group of cylinders are or are to be combinated in order to control access.

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Keying conference

a meeting of the end user and the key system supplier at which the keying and levels of keying, including future expansion, are determined and specified.

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Keying kit

a compartment container which holds an assortment of tumblers, springs and/or other parts.

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Keying schedule

a detailed specification of the keying system listing how all cylinders are to be keyed and the quantities, markings, and shipping instructions of all keys and/or cylinders to be provided.

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Keying symbol

a designation used for a lock or cylinder combination in the standard key coding system; e.g., AAI, XAAl, XIX, etc.

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Keyway

the opening in a lock or cylinder which is shaped to accept a key bit or blade of a proper configuration. The exact cross sectional configuration of a keyway as viewed from the front. It is not necessarily the same as the key section.

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Keyway post

the projecting pin of a lock or cylinder which enters the hollow end of a key.

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Keyway unit

the plug of certain binary type disc tumbler key-in-knob locks.

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Keyway ward

a ward which prevents entry of an incorrect key into a cylinder or lock.

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Kick plate

a protective plate mounted on the bottom of a door to minimize damage to the door.

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Knock-out tag

the portion of a key bow where a code number may be stamped and which is designed to be removed from the bow prior to normal usage.

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KR

keyed random. Key retaining.

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KWV

keyway.

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L

L-handle

an L-shaped handle assembly which may be lockable.

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L-handle lock

a cabinet lock with an L-shaped handle.

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Laminated padlock

a padlock whose case is constructed of separate plates normally riveted together.

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Latch

a mechanical device which automatically keeps a door closed until a deliberate action is used to retract it.

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Latch bolt

a spring actuated bolt, normally with one or more beveled surfaces which when aligned with the strike, engages it automatically.

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Latching speed (of a door closer)

the final speed of a door just prior to closing.

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Latchset

a non-locking device which contains only a latch bolt, a means of operating said latch and the required trim.

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Layout tray

a container used to organize cylinder parts during keying or servicing.

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Lazy cam/Tailpiece

a cam or tailpiece designed to remain stationary while the cylinder plug is partially rotated and/or vice-versa.

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Levels of keying

the divisions of a master key system organized into hierarchies of access.

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Lever pack

a set of lever tumblers.

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Lever tumbler

a flat, spring-loaded tumbler which usually pivots on a post. It contains a gate which must be aligned with a fence to allow movement of the bolt.

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Loading tool

a tool which aids installation of cylinder components into the cylinder shell.

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LOBC

locked on by combination.

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Lock

any device which prevents access or use by requiring special knowledge or equipment.

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Lock service package

a kit offered by the manufacturer or distributor of a product which contains what he deems required to properly service the product.

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Lock stile

the vertical edge of a door designed for lock or latch installation.

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Locker lock

a cabinet lock designed specifically for use on lockers.

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Locking lug

a fixed component of a safe which locks the safe door in place in the locked position.

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Locking lug nut

a lug nut which requires the use of a key or special wrench.

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Lockout

any situation in which the normal operation of a lock or cylinder is prevented.

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Lockout key

a key made in two pieces. One piece is trapped in the keyway by the tumblers when inserted and blocks entry of any regular key. The second piece is used to remove the first piece.

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Lockset

a locking device, complete with trim, mounting hardware and strike.

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Locksmith

a person with the knowledge and ability to select, install, service and bypass all the components of an electrical or mechanical lock.

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M

MACS

maximum adjacent cut specification.

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Magnetic contact

an electrical switch activated by magnetic attraction or repulsion.

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Maid's master key

the master key in a hotel master key system given to the maid. It operates only cylinders of the guest rooms and linen closets in the maid's designated area.

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Maison key system

[from the French meaning "house'' key system] a keying system in which one or more cylinders are operated by every key (or relatively large numbers of different keys) in the system; e.g., main entrances of apartment buildings operated by all individual suite keys of the building.

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Man trap

a sally port designed for pedestrian traffic.

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Manipulation key

any key other than a correct key which can be variably positioned and/or manipulated in a keyway to operate a lock or cylinder.

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Master disc

a special disc tumbler with multiple gates to receive a sidebar.

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Master key

a key which operates all the master keyed locks or cylinders in a group, each lock or cylinder usually operated by its own change key. To combinate a group of locks or cylinders such that each is operated by its own change key as well as by a master key for the entire group.

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Master key changes

the number of different usable change keys available under a given master key.

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Master key system

any keying arrangement which has two or more levels of keying. A keying arrangement which has exactly two levels of keying.

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Master keyed

of or pertaining to a cylinder or group of cylinders which are or are to be combinated so that all may be operated by their own change keys and by additional keys known as master keys.

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Master keyed only

of or pertaining to a lock or cylinder which is or is to be combinated only to a master key.

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Master lever

a lever tumbler which can align some or all other levers in its lock so that their gates are at the fence. It is typically used in locker locks.

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Master pin

usually a cylindrical shaped tumbler, flat on both ends, placed between the top and bottom pin to create an additional shear line. A pin tumbler with multiple gates to accept a sidebar.

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Master ring

a cube shaped sleeve located between the plug and shell of certain cylinders to create a second shear line. Normally the plug shear line is used for change key combinations and the shell shear line is used for master key combinations.

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Master ring lock/cylinder

a lock or cylinder equipped with a master ring.

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Master wafer

a ward used in certain binary type disc tumbler key-in-knob locks, see also "master pin" and "stepped tumbler".

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Matrix format master keying

a method of generating combinations and assigning key symbols in a master key system through the use of a matrix.

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Maximum adjacent cut specification

the maximum allowable difference between adjacent cut depths.

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Maximum opposing cut specification

the maximum allow depths to which opposing cuts can be mack without breaking through the key blade. This is typically a consideration with dimple keys.

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Metal desk lock

a cabinet lock with a vertically sliding bolt located at the rear of the cylinder.

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Meter lock

a padlock whose shackle consists of a single removable post, designed for lucking utility meters or valves. Any of several small devices specifically designed to lock utility meters or valves and which require either a key or special wrench for removal.

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Mis-cut

of or pertaining to a key which has been cut incorrectly. A mis-cut key.

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MK

master key.

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MK section

master key section.

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MK'd

master keyed.

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MK'D ONLY

master keyed only.

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MOCS

maximum opposing cut specification.

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Mogul cylinder

a very large pin tumbler cylinder whose pins, springs, key, etc. are also proportionally increased in size. It is typically used in prison locks.

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Mortise cylinder

a threaded cylinder typically used in mortise locks of American manufacture.

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MP

manipulation proof.

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MR

manipulation resistant.

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MS

Maximum Security. A trademark of the Adams Rite Manufacturing Co.

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Mullion

a vertical center post in the frame of a pair of doors.

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Multi-section key blank

a key section which enters more than one, but not all keyways in a multiplex key system.

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Multiple gating

a means of master keying by providing a tumbler with more than one gate.

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Multiplex key blank

any key blank which is part of a multiplex key system.

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Multiplex key system

a series of different key sections which may be used to expand a master key system by repeating bittings on additional key sections. The keys of one key section will not enter the keyway of another key section. This type of system always includes another key section which will enter more than one, or all of the keyways. A keying system which uses such keyways and key sections.

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Mushroom pin

a pin tumbler, usually a top pin, which resembles a mushroom. It is typically used to increase pick resistance.

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N

NCK

symbol for "no change key,” primarily used in hardware schedules.

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Neck (of a key)

the portion of a bit key between the shoulder and the bits. The portion of a cylinder key between the shoulder and the bow.

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Negative locking

locking achieved solely by spring pressure or gravity which prevents a deep key cut from operating a lock or cylinder.

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NFPA 101

National Fire Protection Association life safety code.

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NFPA 80

National Fire Protection Association standards for doors and windows.

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NFS

non-fail safe.

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Night latch

a rim mounted auxiliary latch bolt.

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NKR

non key retaining.

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NLSA

National Locksmith Suppliers Association.

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NMK

a keying symbol which means "not master keyed" and is suffixed in parentheses to the regular key symbol. It indicates that the cylinder is not to be operated by the master keys specified in the regular key symbol; e.g., AB6(NMK).

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Non key retaining

of or pertaining to a lock whose key can be removed in both the locked and unlocked positions.

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Non-fail safe

a feature of a security device designed to remain engaged, for security purposes during a power loss.

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Non-handed

pertaining to hardware which is manufactured in a way which allows installation on doors of any orientation without requiring modification or adjustment to accommodate the door orientation.

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Non-keyed

having no provision for key operation NOTE: This term also includes privacy function locksets operated by emergency key.

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Non-original key

any key blank other than an original key blank.

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Non-removable key

a key which has one or more cuts on it which trap the key in the lock upon insertion.

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Non-removable pin

pertaining to a hinge whose pin cannot be removed when the door is closed.

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Nose

the part of a non-cylinder lock which contains the keyway and rotates without a horn.

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NRK

non-removable key.

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NRP

non-removable pin.

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NUR

symbol for nurse's key.

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Nurse's key

a selective master key used in a hospital keying system.

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O

Occupancy type

the use to which an area of a building is put with reference to the prevailing life safely or building code.

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Odometer method

a means of progressing key bittings using a progression sequence of right to left.

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One bitted

of or pertaining to a cylinder which is or is to be combinated to keys cut to the manufacturer's reference number one bitting.

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One column progression

a process wherein key bittings are obtained by using the cut possibilities in one column of the key bitting array.

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One pin master key

a master key for all combinations obtained by progressing only one bitting position.

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Open gated

pertaining to a lever tumble whose gate is in the edge of the tumbler.

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Opening index

the index or mark to which a combination is dialed in order to effect an opening.

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Operating key

any key which will properly operate a lock or cylinder to lock or unlock the lock mechanism and is not a control key or reset key.

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Operating shear line

any shear line which allows normal operation of a cylinder or lock.

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Original key blank

a key blank supplied by the lock manufacturer to fit that manufacturer's specific produce.

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Overhead stop

a door stop that contacts the door near the top.

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P

Pack

the set of tumblers in a lever tumbler or combination lock.

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Padlock

a detachable and portable lock with a shackle which locks into its case.

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Page master key

the three pin master key for all combinations listed on a page in the standard progression format.

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Panic button

any switching device in an alarm system designed to be activated by a person in a panic situation. It creates an immediate alarm condition.

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Paracentric

of or pertaining to a keyway with one or more wards on each side projecting beyond the vertical center line of the keyway to hinder picking. Of or pertaining to a key blank made to enter such a keyway.

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Pattern key

an original key kept on file to use in a key duplicating machine when additional keys are required. Any key which is used in a key duplicating machine to create a duplicate key.

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Pawl

the cam of certain automotive cylinders.

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Peanut cylinder

a mortise cylinder of 3/4" diameter.

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Personal identification number

a series or numbers and/or letters associated with a particular individual as a means of identification.

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Pick

a tool or instrument, other than the specifically designed key, made for the purpose of manipulating tumblers in a lock or cylinder in to the locked or unlocked position through the keyway, without obvious damage. To manipulate tumblers in a keyed lock mechanism through the keyway, without obvious damage, by means other than the specifically designed key.

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PIN

personal identification number.

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Pin chamber

the corresponding hole drilled into the cylinder shell and/or plug to accept the pins and spring.

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Pin kit

a type or keying kit for a pin tumbler mechanism.

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Pin stack

all the tumblers in a given pin chamber.

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Pin stack height

the measurement of a pin slack, often expressed in units of the lock manufacturer's increment or as an actual dimension.

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Pin tumbler

usually a cylindrical shaped tumbler. Three types are normally used: bottom pin, master pin and top pin.

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Pin tweezers

a tool used in handling tumblers and springs.

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Pinning

to install pin tumblers into a cylinder an/or cylinder plug.

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Pinning block

a holding fixture which assists in the loading of tumblers into a cylinder or cylinder plug.

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Pinning chart

a numerical diagram which indicates the sizes and order of installation of the various pins into a cylinder. The sizes are usually indicated by a manufacturer's reference number which equals the quantity of increments a tumbler represents.

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PIR

passive infra-red

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Plug

the part of a cylinder which contains the keyway, with tumbler chambers usually corresponding to those in the cylinder shell.

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Plug follower

a tool used to allow removal of the cylinder plug while retaining the top pins, springs, and/or other components within the shell.

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Plug holder

a holding fixture which assists in the loading of tumblers into a cylinder plug.

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Plug retainer

the cylinder component which secures the plug in the shell.

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Plunger lock

any of various spring-loaded locks or cylinders which move in or out to accomplish a locking function.

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Pop out lock

a plunger lock usually used on vending machines to prevent operation of a T-handle.

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Positional master keying

a method of master keying typical of certain binary type disc tumbler key-in-knob locks and of magnetic and dimple key cylinders. Of all possible tumbler positions within a cylinder, only a limited number contain active tumblers. The locations of these active tumblers are rotated among all possible positions to generate key changes. Higher level keys must have more cuts or magnets than lower level keys.

Positive locking

the condition brought about when a key cut which is too high forces its tumbler into the locking position. This type or locking does not rely on gravity or spring pressure.

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Post (of a key)

the portion of a bit key between the tip and the shoulder, to which the bits are attached.

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Power locks

electrically or electro-pneumatically operated locks.

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Practical key changes

the total number of usable different combinations available for a specific cylinder or lock mechanism.

Pre-assembled lockset

a lock designed to be installed into a cutout in the edge of a door. The lock body and most or all of its trim need no further assembly other than securing it to the door.

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Prep

the location and dimensions of the cut outs and reinforcing in a door or frame required to accept a piece of hardware. To prepare a door or frame for installation of a lock or other hardware.

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Prep key

a type of guard key for a safe deposit box lock with only one keyway. It must be turned once and withdrawn before the renter's key will unlock the unit.

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Primary key

a key which operates the ignition lock on a vehicle. It may or may not also operate some or all the other locks on a vehicle.

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Privacy key

a key which operates an SKD cylinder.

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Profile cylinder

a cylinder with a usually uniform cross section, which slides into place and usually is held by a mounting screw. It is typically used in mortise locks of non-U.S. manufacture.

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Progress

to select possible key bittings from the key bitting array, usually in numerical order.

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Progression

a logical sequence of selecting possible key bittings, usually in numerical order from the key bitting array.

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Progression column

a listing of the key bitting possibilities available in one bitting position as displayed in a column of the key bitting array.

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Progression list

a bitting list of change keys and master keys arranged in sequence of progression.

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Progressive

any bitting position which is progressed rather than held constant.

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Proprietary

of or pertaining to a keyway anti key section assigned exclusively to one end user by the lock manufacturer. It may also be protected by law from duplication.

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Pullman keeper

a type of keeper which is shaped to operate with the radiused contour of a Pullman latch.

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Pullman latch

a type of latch which pivots like a hinge and whose locking side is radiused.

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R

Radiused blade bottom

the bottom of a key blade which has been radiused to conform to the curvature of the cylinder plug it is designed to enter.

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Random master keying

any undesirable process used to master key which uses unrelated keys to create a system.

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Rap

to unlock a plug from its shell by striking sharp blows to the spring side of the cylinder while applying tension to the plug. To unlock a padlock shackle from its case by striking sharp blows to the sides in order to disengage the locking dogs.

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Ratchet lock

any lock which incorporates a ratchet device allowing locking in more than one position.

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Read

to decode a lock combination visually without disassembly of the lock or cylinder.

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Read key

a key which allows access to the sales and/or customer data on certain types of cash control equipment (e.g., cash registers).

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Recombinate

to change the combination of a lock, cylinder, or key.

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Recore

to rekey by installing a different core.

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Register groove

the reference point on the key blade from which some manufacturers locate the bitting depths.

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Register number

a reference number, typically associated by the lock manufacturer to an entire master key system. A blind code assigned by some lock manufacturers to higher level keys in a master key system.

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Rekey

to change the existing combination of a cylinder or lock.

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Remote release

a mechanism for permitting the unlocking of any lock device at a distance from the device.

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Removable core

a key removable core which can only be installed in one type of cylinder housing; e.g., rim cylinder, mortise cylinder or key-in-knob lock.

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Removable cylinder

a cylinder which can be removed from a locking device by a key and/or tool.

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Removable shackle

referring to a type of padlock which is unlocked by removing the shackle from the case.

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Removal key

the part of a two-piece key which is used to remove its counterpart from a keyway.

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Renter's key

a key which must be used together with a guard key, prep key or electronic release to unlock a safe deposit lock. It is usually different for every unit within an installation.

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Repin

to replace pin tumblers, with or without changing the existing combination.

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Reset key

a key used to set some types of cylinders to a new combination. Many of these cylinders require the additional use of tools and/or the new operating key to establish the new combination. A key which allows the tabulations on various types of cash control equipment (e.g., cash registers) to be cleared from the records of the equipment.

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Restricted

of or pertaining to a keyway and corresponding key blank whose sale and/or distribution is limited by the lock manufacturer in order to reduce unauthorized key proliferation.

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Retainer

a component which is clipped or staked in place to maintain the working relationship of other components.

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Reversible

pertaining to hardware which is manufactured in a way which allows field assembly or adjustment to accommodate installation on doors with different orientations.

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Reversible key

a symmetrical key which may be inserted either way up to operate a lock.

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RH

right-hand.

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RHR

right hand reverse bevel.

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Rim cylinder

a cylinder typically used with surface applied locks and attached with a back plate and machine screws. It has a tailpiece to actuate the lock mechanism.

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Rim lock

a lock or latch typically mounted on the surface of a door or drawer.

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Ring key

a key attached to a ring to be worn on the finger.

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RL

The title " Registered Locksmith" as awarded by ALOA

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Root depth

the dimension from the bottom of a cut on a key to the bottom of the blade.

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Rose

a typically circular escutcheon.

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Rotary tumbler

a circular tumbler with one or more gates. Rotation of the proper key aligns the tumbler gates at a sidebar, fence or shackle slot.

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Rotating constant

one or more cuts in a key of any level which remain constant throughout all levels and are identical to the top master key cuts in their corresponding positions. The positions where the top master key cuts are held constant may be moved, always in a logical sequence.

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Rotating constant method

a method used to progress key bittings in a master key system, wherein at least one cut in each key is identical to the corresponding cut in the top master key. The identical cuts are moved to different locations in a logical sequence until each possible planned position has been used.

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Round back

pertaining to a rim cabinet lock whose mounting flanges and case form the general shape of a circle when viewed from the back.

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Row master key

the one pin master key for all combinations listed on the same line across a page in the standard progression format.

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S

S/A

sub-assembly

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Sally port

an access control area with doors or gates secured by interlocks such that only one may be opened at a time.

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SBCCI

Southern Building Code Congress International.

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Scalp

a thin piece of metal which is usually crimped or spun onto the front of a cylinder. It determines the cylinder's finish and may also serve as the plug retainer.

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Scandinavian padlock

a cast case padlock with an elliptical cross section. The locking mechanism is a set of rotating disc tumblers which engage notches in the cast shackle and may be rotated by the angled cuts cast on the key.

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Screen door lock

a lock designed for the thin stiles typically found on screen and storm doors.

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Screwless knob

a mortise lock knob assembly secured to the spindle without screws.

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Screwless rose

a mortise lock rose installed without screws.

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Second generation duplicate

a key reproduced from a first generation duplicate.

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Secondary key

a key which operates certain locks on a vehicle, but not the ignition lock.

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Secret gate latch

a small key less rim latch, which when properly installed, is operated by pressing a concealed actuator.

Secret gate latch

a small keyless rim latch, which when properly installed, is operated pressing a concealers actuator.

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Security collar

a protective cylinder collar.

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Segmented follower

a plug follower which is sliced into sections which arc introduced into the cylinder shell one at a time. It is typically used with profile cylinders.

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Selective key system

key system in which every key has the capability of being a master key. It is normally used for applications requiring a limited number of keys and extensive cross keying.

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Selective master key

an unassociated master key which can be made to operate any specific lock in the entire system in addition to the regular master keys and/or change keys for the cylinder without creating key interchange.

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Sequence of progression

the order in which bitting positions are progressed to obtain change key combinations.

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Series wafer

a type of disc tumbler used in certain binary type disc tumbler key-in-knob locks. Its presence requires that no cut be made in that position on the operating key.

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Set-up key

a key used to calibrate some types of key machines.

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Set-up plug

a type of loading tool shaped like a plug follower. It contains pin chambers and is used with a shove knife to load springs and top pins into a cylinder shell.

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Seven column progression

a process wherein key bittings are obtained by using the cut possibilities in seven columns of the key bitting array.

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Seven pin master key

a master key for all combinations obtained by progressing seven bitting positions.

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Shackle

the part of a padlock which passes through an opening in an object or fits around an object and is ultimately locked into the case. The portion of a restraint which fits around the wrist, ankle, neck, waist or thumb.

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Shackle retaining pin

a pin which keeps an unlocked shackle heel in the case.

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Shackle spring

a spring which pushes the shackle into the open position when the padlock is unlocked.

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Shank

the part of a bit key between the bow and the stop or if there is no shoulder stop, the part between the bow and the near side of the bit.

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Shear line

a location in cylinder at which specific tumbler surfaces must be aligned, removing obstructions which prevented the plug from moving.

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Shell

the part of the cylinder which surrounds the plug and which usually contains tumbler chambers corresponding to those in the plug.

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Shim

a thin piece of material used to unlock the cylinder plug from the shell by separating the pin tumblers at the shear line, one at a time. To unlock a cylinder plug from its shell by using a shim.

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Shoe

a bracket which attaches the arm of a door closer to the door or frame. The surface mounted case and guide components of an exit device. A mortise lock component which transfers pivoting motion of a thumbpiece to linear movement of the latch bolt.

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Shoulder

any key stop other than a tip stop.

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Shouldered pin

a bottom pin whose diameter is larger at the flat end to limit its penetration into a counter-bored chamber.

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Shove knife

a tool used with a set-up plug which pushes the springs and pin tumblers into the cylinder shell.

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Showcase lock

normally a ratchet lock or plunger lock used on a by-passing door.

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Shrouded shackle

a shackle which is protected from cutting or tampering by design or by the use of secondary shields.

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Shunt switch

a maintained contact switch, often key operated.

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Shut out key

usually used in hotel keying systems, a key which will make the lock inoperative to all other keys in the system except the emergency master key, display key, and some types of shut out keys.

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Shut out model

the state of a hotel function lockset which prevents operation by all keys except the emergency master key, display key, and some types or shut out keys.

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Shutter

a spring loaded device which closes upon the removal of a cylinder tailpiece, protecting a locking device from being manipulated. A key in the form of a sickle inserted through a hole in a door to actuate a bolt on the opposite side of the door.

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Side ward

a ward which prevents entry of an incorrect key into a non-cylinder lock.

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Side ward cut

a cut made into a key to bypass a side ward.

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Sidebar

a cylinder component which enters the gate into the tumbler to allow plug rotation.

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Sidebar lock

a lock mechanism which incorporates a sidebar.

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Simple latch

a non-deadlocking latch.

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Simplex key section

a single independent key section which cannot be used in a multiplex key system.

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Simultaneous retraction

a feature which allows retraction of both the deadbolt and latchbolt in the same operation.

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Single cylinder

pertaining to a lock with key operation from only one side.

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Single key section

an individual key section which can be used in a multiplex key system.

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Single step progression

a progression using a one increment difference between bittings of a given position.

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Single-acting lever tumbler

a lever tumbler which must be moved a minimum distance to allow travel of a bolt, but cannot be moved so far as to restrict travel of the bolt.

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Six column progression

a process wherein key bittings are obtained by using the cut possibilities in six columns of the key bitting array.

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Six pin master key

a master key for all combinations obtained by progressing six bitting positions.

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SKD

symbol for "single keyed," normally followed by a numerical designation in the standard key coding system; e.g., SKD I, SKD2, etc. It indicates that a cylinder or lock is not master keyed but is part of the keying system.

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Skeleton key

any non-cylinder key whose bit, blade, and/or post is cut away enough to allow it to enter and turn in locks with different ward arrangements.

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Slider

a tumbler which is normally flat, has a gate and moves with a linear or lateral motion instead of pivoting like a lever tumbler.

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Slim jim

a narrow strip of spring steel used to bypass the cylinder and unlock vehicle doors.

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SMK

sub-master key.

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Spacing

the dimensions from the stop to the center of the first cut and/or to the centers or successive cuts.

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Spare tire lock

a lock designed to prevent removal of a vehicle's spare tire.

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Special application cylinder

any cylinder other than a mortise, rim, key-in-knob or profile cylinder.

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Spindle

a component which transfers rotary motion from outside a lock or latch case to an inner mechanism.

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Split pin master keying

a method of master keying a pin tumbler cylinder by installing master pins into one or more pin chambers.

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Split spindle

a multi-piece spindle which allows a knob or lever to be installed on only one side of a door.

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Spool pin

usually a top pin which resembles a spool, typically used to increase pick resistance.

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Spring cover

a device for sealing one or more pin chambers.

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Spring seat

the point at which a spring is anchored, located or attached and from which it exerts force.

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Square back

pertaining to a rim cabinet lock whose mounting flanges and case form the general shape of a square.

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Standard key coding system

an industry standard and uniform method of designating all keys and/or cylinders in a master key system. The designation automatically indicates the exact function and keying level of each key and/or cylinder in the system, usually without further explanation.

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Standard progression format

a systematic method of listing and relating all change key combinations to all master key combinations in a master key system. The listing is divided into segments known as blocks, horizontal groups, vertical groups, rows, and pages for levels of control.

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Step pin

a spool or mushroom pin which has a portion of its end machined to a smaller diameter than the opposite end. It is typically used as a top pin to improve pick resistance by some manufacturers of high security cylinders.

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Stepped tumbler

a special (usually disc) tumbler used in master keying. It has multiple bearing surfaces for blades of different key sections.

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Stop (of a door)

the projecting portion of a door frame upon which the door rests when closed.

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Stop (of a key)

the part of a key from which all cuts are indexed and which determines how far the key enters the keyway.

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Stop works

a button or toggle mechanism which prevents operation of a knob, lever or thumbpiece in a non-bored lock.

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Stop works button

a one or two-piece stop works activator.

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Store door function

a lockset function where a deadbolt is operated by key from either side and a latch is operated by working trim from either side or a deadlocking latch that can be withdrawn by working trim from either side except when both sides are locked by key from either side.

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Sub-master key

the master key level immediately below the master key in a system of six or more levels of keying.

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Substitution code

a code whose individual characters are converted to individual key cuts or combination numbers by means of a reference table.

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Swing clear hinge

a hinge that allows the door to swing far enough away from the jamb to fully clear the opening at 90 degrees when open.

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Switch lock

a lock which incorporates an electrical switch as an integral part of its construction. A large padlock designed for use on railroad switches.

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Swivel spindle

normally a two-piece spindle assembly whose two halves are designed to turn independently.

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T

T-handle

a T-shaped handle assembly which may be lockable.

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Tailpiece

an actuator attached to the rear of the cylinder, parallel to the plug. Typically used on rim. key-in-knob or special purpose cylinders.

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Telescoping column

a steering column adjustable for length.

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Template

a pattern used to mark cutout locations for hardware installation.

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Template hinge

a hinge with dimensions, hole locations and tolerances which conform to ANSI standard A 156.7.

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Theoretical key changes

the total possible number of different combinations available for a specific cylinder or lock mechanism.

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Threaded rose

a rose with an internally threaded ferrule.

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Three column progression

a process wherein key bittings are obtained by using cut possibilities in three columns of the key bitting array.

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Three pin master key

a master key for all combinations obtained by progressing three bitting positions.

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Three point latch

a self-latching device designed to latch a door at the top, bottom and edge.

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Throat cut

the cut made into a key to bypass a throat ward.

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Throat ward

an obstruction formed in a lock's case or horn at the point of key entry which prevents key rotation.

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Throw

the distance a bolt or latch projects from the faceplate or case of a lock in the extended position.

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Throw member

an intermediate actuator which engages the rear of the plug to transfer motion to a cam, tailpiece or other actuator.

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Throw turn cylinder

a cylinder with a turn knob rather than a keyway and tumbler mechanism.

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Thumbpiece

a generally flat, projecting latch actuator found above a grip handle and depressed by the thumb.

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Tilt column

a steering column design which permits vertical adjustment of the steering wheel.

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Tip

the portion of the key which enters the keyway first.

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Tip stop

a type of stop located at or near the tip of the key.

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TMK

top master key.

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Toe (of a shackle)

that part of the shackle which may be removed from the padlock body.

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Toggle

a pivoting one-piece stop works activator.

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Tolerance

the deviation allowed from a given dimension.

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Top jamb mount

surface application of a door closer body directly to the header.

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Top master key

the highest level master key in a master key system.

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Top of blade

the bitted edge of a single bitted key.

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Top pin

usually a cylindrical shaped tumbler, usually flat on both ends and installed directly under the spring in the pin stack.

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Total position progression

a process used to obtain key bittings in a master key system wherein bittings of change keys differ from those of the top master key in all bitting positions.

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Touch bar

a type of exit device actuator which typically does not pivot and retracts the bolt with a minimum amount of pressure.

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Touch pad

an exit device actuator with a paddle shape. A remote door opener activator, typically electronic, which facilitates handicap access.

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Trim

exposed components of a lockset or latchset which allow operation, enhance appearance or provide protection.

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Triplex spindle

a spindle with three wedge shaped bars which spread to grip the inside of the knob shank when the knob set screw is tightened.

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Try-out key

a manipulation key which is usually part of a set, used for a specific series, keyway, and/or brand of lock.

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Tubular key

a key with a tubular blade. The key cuts are made into the end of the blade, around its circumference.

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Tubular key cylinder

a cylinder whose tumblers are arranged in a circle and which is operated by a tubular key.

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Tubular lockset

a bored lockset whose latch or bolt locking mechanism is contained in the component installed into the edge bore.

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Tumbler

a movable obstruction of varying size and configuration in a lock or cylinder which makes direct contact with the key or another tumbler and prevents an incorrect key or torquing device from activating the lock or other mechanism.

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Tumbler spring

any spring which acts directly on a tumbler.

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Turn disk

a disk shaped component with a cam actuated by a thumb turn, normally used in a mortise lock.

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Two column progression

a process wherein key bittings are obtained by using the cut possibilities in two columns of the key bitting array.

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Two pin master key

a master key for all combinations obtained by progressing two bitting positions.

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Two step progression

a progression using a two increment difference between bittings of a given position.

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U

UL

Underwriters Laboratories.

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UL listed

listed in a directory as having passed specific Underwriters Laboratories testing.

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Unassociated change key

a change key which is not directly related to a particular master key through the use of certain constant cuts.

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Unassociated master key

a master key which does not have change keys related to its combination through the use of constant cuts.

Uncombinated

of or pertaining to a cylinder which is or is to be supplied without keys, tumblers and springs. Of or pertaining to a lock, cylinder or key in which the combination has not been set.

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Uncontrolled cross keying

a condition in which two or more different keys under different higher level keys operate one cylinder by design; e.g., XAAI operated by AB, ABI. NOTE: This condition severely limits the security of the cylinder and the maximum expansion of the system, and often leads to key interchange.

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Unidirectional cylinder

a cylinder whose key can turn in only one direction from the key pull position, often not making a complete rotation.

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V

VATS

Vehicle Anti-Theft System

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VD

vertical down.

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Vehicle Anti-Theft System

an electronic system in some General Motors vehicles which uses a resistor pellet of varying value imbedded in a mechanical ignition key.

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Vertical group master key

the two pin master key for all combinations listed in all blocks in a line down a page in the standard progression format.

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VGM

vertical group master key.

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Visual key control

a specification that all keys and the visible portion of the front of all lock cylinders are stamped with standard keying symbols.

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VKC

visual key control.

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VU

vertical up.

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W

Ward

a usually stationary obstruction in a lock or cylinder which prevents the entry and/or operation of an incorrect key.

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Ward cut

a modification of a key which allows it to bypass a ward.

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Warded

having one or more wards.

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Warnock Hersey

an independent testing laboratory.

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Wheel pack

an assembly of combination wheels.

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Wheel puller

a tool used to remove the steering wheel from a column.

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Window bug

an alarm system component designed to detect breaking glass.

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X

X

symbol used in hardware schedules to indicate a cross keyed condition for a particular cylinder; e.g, XAA2, X1X (but not AX7).

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Y

Yoke

a component designed to secure cylinders or turn disks in both sides of a mortise lock by means of a single set screw symbol used in hardware schedules to indicate a cross keyed condition for a particular cylinder; e.g., XAA2, XIX (but not AX7).

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Z

Zero bitted

of or pertaining to a cylinder which is or is to be combinated to keys cut to the manufacturer's reference number "0" bitting.

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