Associated Locksmiths of America

 

The Professional Glossary of Terms Relating to
Cylinders, Keys and Master keying


A B C D E F G H I J K L M N O P Q R S T U V W X Z

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© Copyright 1983 by the ALOA(Associated Locksmiths of America) Sponsored National Task Group for Certified Training Programs, Master Keying Study Group
© Copyright 1982 by the ALOA Sponsored National Task Group for Certified Training Programs, Master Keying Study Group

Study group members: Ken Ehrenreich - Chairman

Billy B. Edwards, Jr.

G. L. Finch

Kristine Gallo

Anthony J. Hoffman

Wiegand Jensen

Gordon S. Morris

All rights reserved.

Permission is hereby granted to reprint terms and definitions contained herein with the

following stipulations:

  1. Terms and definitions are to be reprinted in their entirety.
  2. Credit is to be given to the Master Keying Study Group of the ALOA Sponsored National Task Group for Certified Training Programs.

AUTHORS' PREFACE

This definitive work was undertaken by the members of the master keying study group of the ALOA Sponsored National Task Force for Certified Training Programs. The master keying study group set out in 1979 to establish a standardized curriculum for the teaching of professional key making and an introduction to master keying. Members of our study group come from both the locksmithing and lock manufacturing sectors.

It became evident very early that there were many inconsistencies in the language used to discuss and demonstrate our subject. Before the class could be designed therefore, we had to standardize the terminology to be used. Naturally, this meant creating a glossary of terms relating to cylinders, keys and master keying.

Over three years were spent in the research and development of this glossary, and every attempt was made to include all terms in common use in the trade. Upon completion of the first draft, more than 150 copies were sent to local locksmith associations, lock manufacturers and other recognized security specialists. The results of their evaluations virtually doubled the size of this glossary.

It will be noted that many terms are defined as "see (another term)." This is to guide the reader to the primary term. Terms were established as primary because 1) they more closely describe the particular item or concept; and/or 2) they are more widely used, rather than limited to any particular geographic area.

As a group and individually, we now feel that the glossary is the most nearly complete and accurate ever compiled on this subject. We have agreed to endorse it for publication and distribution throughout our industry.

The acceptance and use of these terms and definitions will be a major step in the direction of universal understanding among locksmiths and lock manufacturers alike.

Ken Ehrenreich - Study Group Chairman Billy B. Edwards, Jr. G. L. Finch

Kristine Gallo

Anthony J. Hoffman

Wiegand Jensen

Gordon S. Mon-is

Edited by Dorothy G. Friend



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A, AA, AA1, 1AA, etc.

  1. see "key symbol"
  2. see "keying symbol"
  3. see "standard key coding system"

across-the-key-progression

n. see "total position progression"

actuator

n. a device, usually connected to a cylinder, which, when activated, may cause a lock mechanism to operate

adjacent cut differential

n. see "maximum adjacent cut specification"

adjustable mortise cylinder

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

AFTE

abb. Association of Firearm and Toolmark Examiners

AHC

abb. Architectural Hardware Consultant (as certified by DHI)

all-section key blank

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

ALOA

abb. Associated Locksmiths of America

angle of cut

n. 1. see "cut angle" #1

2. see "degree of rotation"

angularly bitted key

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

ANSI

abb. American National Standards Institute

armored front

n. see "faceplate" #1

ASIS

abb. American Society for Industrial Security

associated change key

n. a change key which is related directly to particular masterkey(s) through the use of constant cuts

associated master key

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

ASTM

abb. American Society for Testing and Materials


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back of blade

n. see "bottom of blade"

back plate

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

backed off blade

n. see "radiused blade bottom"

ball bearing

n. 1. a metal ball used in the pin stack to accomplish some types of hotel or construction keying

2. a ball, usually made of steel, used by some lock manufacturers as the bottom element inthe pin stack in one or more pin chambers

3. any metal ball used as a tumbler's primary component

ball end pin

n. see "bottom pin"

barrel

n. see "plug"

Bell type key

n. 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.

BHMA

abb. Builders Hardware Manufacturers Association

bible

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

bicentric cylinder

n. 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.

bidirectional cylinder

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

binary cut key

n. a key whose combination only allows for two possibilities in each bitting position: cut/nocut

binary type cylinder or lock

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

bit

1. n. the part of the key which serves as the blade, usually for use in a warded or lever tumbler lock

2. n. see "keycut(s)"

3. v. to cut a key

bitting

n. 1. the number(s)which represent(s) the dimensions of the key cut(s)

2. the actual cut(s) or combination of a key

bitting depth

n. the depth of a cut which is made into the blade of a key

bitting list

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

bitting position

n. 1. the location of a key cut

2. see "spacing"

blade

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

blade tumbler

n. see "disc tumbler"

blank

  1. n. see "key blank"
  2. adj. uncut

blind code

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

block master key

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

blocking ring

n. see "cylinder collar"

blockout key

n. see "lockout key"

bottom of blade

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

bottom pin

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

bow

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

bow stop

n. a type of stop located near the key bow

broach

  1. n. a tool used to cut the keyway into the cylinder plug
  2. v. to cut the keyway into a cylinder plug with a broach

builders' master key

n. see "construction master key"

building master key

n. a master key used to operate all locks in a given building

bypass key

n. the key which operates a key override cylinder


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cam

n. a flat actuator or locking bolt attached to the rear of a cylinder perpendicular to its plug and rotated by the key

cam lock

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

cap

  1. n. a spring cover for a single pin chamber
  2. n. a part which may serve as a plug retainer and/or a holder for the tailpiece
  3. v. to install a cap

capping block

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

cell

n. see "pin chamber"

central key system

n. see "maison key system"

chain key system

n. see "selective key system"

chamber

n. any cavity in a cylinder plug and/or shell which houses the tumbrels)

change key

n. 1. a key which operates only one cylinder or one group of keyed alike cylinders in a keying system

2. see "reset key" #1

change key constant

n. see "constant cut"

change key section

n. see "single key section"

changeable bit key

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

chart

n. 1. see "pinning chart"

2. see "progression list"

3. see "bitting list"

4. see "key system schematic"

chip

n. see "master pin" #1

CK

  1. abb. change key
  2. abb. control key

clutch

n. that part of the profile cylinder which transfers rotational motion fi-om the inside or outside element to a common cam or actuator

CMK

abb. construction master key

CMK'D

abb. construction master keyed

code

1. n. a designation assigned to a particular key combination for reference when additional keys or cylinders may be needed. See also, "blind code," "direct code," and "key symbol"

2. v. see "combinate"

code key

n. a key cut to a specific code rather than duplicated from a pattern key. It may or may not

conform to the lock manufacturer's specifications

code list

n. 1. see "bitting list"

2. see "progression list"

code machine

n. see "key coding machine"

code number

n. 1. see "blind code"

2. see "direct code"

code original key

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

column master key

n. see "vertical group master key"

combinate

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

combination

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

combination wafer

n. 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 that position of the operating ke@s)

common keyed

adj. see "maison key system"

compensate drivers

v. 1. 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

2. see "graduated drivers" #1

complementary keyway

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

composite keyway

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

concealed shell cylinder

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

connecting bar

n. see "tailpiece"

constant cut

n. 1. Any bitting(s) which are identical in corresponding positions from one key to another in a keying system. They usually serve to group these keys together within a given level of keying, and/or link them with keys of other levels.

2. see "rotating constant"

construction breakout key

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

construction core

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

construction master key

n. a key normally used by construction personnel for a temporary period during building construction. It may be rendered permanently inoperative wthout disassembling the cylinder.

construction master keyed

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

control cut

n. 1. any bitting which operates the retaining device of an interchangeable or removable core

2. see "constant cut" #1

control key

n. 1. a key whose only purpose is to remove and/or install an interchangeable or removable core

2. a bypass key used to operate and/or reset some combination type locks

3. a key which allows disassembly of some removable cylinder locks

control lug

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

control sleeve

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

controlled cross keying

n. a condition in which two or more different keys of the same level of keying and under the same higher level key(s) operate one cylinder by design; e.g., XAA1 operated by AA2 (but not XAA1 operated by ABl)

NOTE: This condition could severely limit the security of the cylinder and the maximum expansion of the system when (1) more than a few of these different keys operate a cylinder, or (2) more than a few differently cross keyed cylinders per system are required.

core

n. a complete unit, often with a figure 8 shape, which usually consists of the plug,

shell, tumblers, springs, plug retainer and spring covens). It is primarily used in removable and interchangeable core cylinders and locks.

CPP

abb. Certified Protection Professional (as certified by ASIS)

cross keyed

adj. see "cross keying"

cross keying

n. the deliberate process of combinating a cylinder (usually in a master key system) to

two or more different keys which would not normally be expected to operate it together. See also "controlled cross keying," and "uncontrolled cross keying".

csi

abb. Construction Specifiers Institute

cut

  1. n. see "key cut(s)"
  2. v. to make cuts into a key blade

cut angle

n. 1. a measurement,usually expressed in degrees, for the angle between the two sides of a key cut

2. see "degree of rotation"

cut depth

n. 1. see "bitting depth"

2. see "root depth"

cutedge

n. the portion of the key blade which contains the cuts

cut key

n. a key which has been bitted or combinated

cut proffle

n. see "key cut profile"

cut root

n. the bottom of a key cut

cut root shape

n. the shape of the bottom of a key cut.It may have a flat or radius of a specific dimension, or be a perfect "V".

cut rotation

n. see "degree of rotation"

cutter

n. the part of a key machine which makes the cuts into the key blank

cylinder

n. a complete operating unit which usually consists of the plug, shell, tumblers, springs, plug retainer, a cam/tailpiece or other actuating device, and all other necessary operating parts

cylinder assembly

n. see "cylinder"

cylinder bar

n. see "tailpiece"

cylinder blank

n. a dummy cylinder which has a solid face and no operating parts

cylinder clip

n. a spring steel device used to secure some types of cylinders

cylinder collar

n. a plate or ring installed under the head of a cylinder to improve appearance and/or security

cylinder guard

n. a protective cylinder mounting device

cylinder key

n. a broad generic term including virtually all pin and disc tumbler keys

cylinder plug

n. see "plug"

cylinder ring

n. see "cylinder collar"

cylinder rose

n. see "cylinder collar"

cylinder shell

n. see "shell"


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day key

n. see "change key" #1

declining step key

n. a key whose cuts are progressively deeper fi-om bow to tip

decode

v. to determine a key combination by physical measurement of a key and/or cylinder parts

degree of rotation

n. a specification for the angle at which a cut is made into a key blade as referenced from the perpendicular; e.g., right (R or 2), left (L or 1) or center (=perpendicular) (C). This specification is typically used for some high security keys.

department master key

n. a master key which accesses all areas of a given department depth

n. 1. see "bitting depth"

2. see "root depth"

depth key set

n. a set of keys used to make a code original key on a key duplicating machine to a lock manufacturer's given set of key bitting specifications. Each key is cut with the correct spacing to one depth only in all bitting positions, with one key for each depth.

derived series

n. a series of blind codes and bittings which are directly related to those of another bitting list

detainer disc

n. see "rotary tumbler"

DHI

abb. Door and Hardware Institute

dimple

n. a key cut in a dimple key

dimple key

n. a key whose cuts are drilled or milled into its blade surfaces. The cuts normally do not change the blade silhouette.

direct code

n. a designation assigned to a particular key which includes the actual combination of the key

disc

n. 1. see "disctumbler"

2. see "master pin" #1

3. see "rotary tumbler"

disc tumbler

n. 1. a flat tumblerwhich must be drawn in to the cylinder plug by the proper key so that none of its extremities extends into the shell

2. a flat, usually rectangular tumbler with a gate which must be aligned with a sidebar by the proper key

display key

n. a special change key in a hotel masterkey 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.

double bitted key

n. a key bitted on two opposite surfaces

double pin

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

double sided key

n. see "double bitted key"

driver

n. see "top pin"

driver spring

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

drop

n. 1. see "increment"

2. a pivoting or swinging dust cover

dummy cylinder

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

duplicate

  1. n. see "duplicate key"
  2. v. to copy

duplicate blank

n. see "non-original key blank"

duplicate key

n. any key reproduced from a pattern key

dust cover

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

dustproof cylinder

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


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effective plug diameter

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

ejector hole

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

ejector pin

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

emergency key

n. 1. see "emergency master key"

2. the key with operates a privacy function lockset

emergency master key

n. a specialmaster 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.

EMK

abb. emergency master key

encode

v. see "combinate"

ENG

symbol for engineer's key

engineer's key

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

escutcheon

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

extractor key

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


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face plate

n. 1. a mortise lock cover plate exposed in the edge of the door

2. see "scalp"

factory original key

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

false plug

n. see "plug follower"

fence

n. 1. a projection on a lock bolt which prevents movement of the bolt unless it can enter gates of properly aligned tumblers

2. see "sidebar"

file key

n. see "pattern key" #1

finish

n. a material, coloring and/or texturing specification

fireman's key

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

first generation duplicate

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

first key

n. any key produced without the use of a pattern key

five column progression

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

five pin master key

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

flexible head mortise cylinder

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

floating master key

n. 1. see "unassociated master key"

2. see "selective master key"

floor master key

n. a master key which operates all or most cylinders on a particular floor of a building

follower

n. see "plug follower"

formula

n. see "key bitting array"

four column progression

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

four pin master key

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


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gate

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

gauge key

n. 1. see "depth key set"

2. see "set-up key"

genuine key blank

n. see "original key blank"

GGGMK

abb. great great grand master key

GGM

abb. great grand master key

GGMK

abb. great grandmaster key

GGMK'D

abb. great grandmaster keyed

ghost key

n. see "incidental master key"

GM

abb. grand master key

GMK

abb. grand master key

GMK section

abb. grand master key section

GMK'D

abb. grand master keyed

graduated drivers

n. 1. 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.

2. see "compensate drivers" #1

grand master key

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

grand master key section

n. 1. see "multi-section key blank"

2. see "all-section key blank"

grand master key system

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

grand master keyed

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

great grand master key

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

great grand master key system

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

great grand master keyed

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

great great grand master key

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

great great grand master key system

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

grooving

n. see "key milling"

guard key

n. 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.

guest key

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

guide

n. that part of a key machine which follows the cuts of a pattern key or template during duplication

guide keys

n. pl. see "depth key set"


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hardware schedule

n. 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.

HGM

abb. horizontal group master key

high security cylinder

n. 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

high security key

n. a key for a high security cylinder

HKP

abb. housekeeper's key

hold and vary

n. see "rotating constant method"

hold open cylinder

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

holding fixture

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

hollow driver

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

horizontal group master key

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

housekeeper's key

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

housing

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


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imitation blank

n. see "non-original key blank"

impression

  1. n. the mark made by a tumbler on its key cut
  2. v. to fit a key by the impression technique

impression technique

n. 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

incidental master key

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

increment

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

indicator

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

indirect code

n. see "blind code"

individual key

n. 1. an operating key for a lock or cylinder which is not part of a keying system

2. see "change key" #1

interchange

n. see "key interchange"

interchangeable core

n. 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.

interlocking pin tumbler

n. 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

jiggle key

n. see "manipulation key"

jumbo cylinder

n. a rim or mortise cylinder of 11/2" diameter


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k

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

KA

abb. keyed alike

KA1, KA2, etc.

symbol which indicates that all cylinders so designated are or are to be operated by the same key(s). The numerical designation indicates the keyed alike group or set.

KA/2, KA/3, etc.

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

KBA

abb. key bitting array

KD

abb. keyed different

key

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

key bitting array

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

key bitting specifications

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

key bitting punch

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

key blank

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

key bypass

n. and adj. see "key override"

key change number

n. 1. see "blind code"

2. see "direct code"

3. see "key symbol"

key changeable

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

key changes

n. pl. 1. see "practical key changes"

see "theoretical key changes"

key coding machine

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

key control

n. 1. any method or procedure which limits unauthoiized acquisition of a key and/or controls distribution of authorized keys

2. a systematic organization of keys and key records

key cut(s)

n. the portion of the key blade which remains after being cut and which aligns the tumbler(s)

key cut profile

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

key duplicating machine

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

keygauge

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

key-in-knob cylinder

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

key interchange

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

key machine

n. any machine designed to cut keys. See also "key coding machine" and "key duplicating machine."

key manipulation

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

key milling

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

key override

1. n. a provision allowing interruption or circumvention of normal operation of a

combination lock or electrical device

2. adj. of or pertaining to such a provision, as in "key override cylinder"

key override cylinder

n. a lock cylinder installed in a device to provide a key over-ride function

key picking

n. see "key manipulation"

key pin

n. see "bottom pin"

key profile

n. see "key section"

key pull position

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

key punch

n. see "key bitting punch"

key records

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

key retaining

adj. 1. of or pertaining to a lock which must be locked before its key can be removed

2. of or pertaining to a cylinder or lock which may prevent removal of a key without the use of an additional key and/or tool

key section

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

key stop

n. see "stop (of a key)"

key symbol

n. a designation used for a key combination in the standard key coding system, e.g., A, AA, AA1, etc.

key system schematic

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

key trap core/cylinder

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

keyed

adj. 1. combinated

2. having provision for operation by key

keyed common

adj. see "maison key system"

keyed alike

adj. of or pertaining to two or more locks or cylinders which have or are to have the same combination. They may or may not be part of a keying system.

keyed different

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

keyed random

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

keying

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

keying chart

n. 1. see "pinning chart"

2. see "progression list"

3. see "bitting list"

4. see "key system schematic"

keying diagram

n. see "key system schematic"

keying kit

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

keying levels

n. pl. see "levels of keying"

keying schedule

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

keying symbol

n. a designation used for a lock or cylinder combination in the standard key coding system; e.g., AA1, XAA1, XlX, etc.

keyset

n. 1. see "key symbol"

2. see "keying symbol"

keyway

n. 1. the opening in a lock or cylinder which is shaped to accept a key bit or blade of a proper configuration

2. the exact cross sectional configuration of a keyway as viewed from the front. It is not necessarily the same as the key section.

keyway shutter

n. see "dust cover"

keyway unit

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

KR

  1. abb. keyed random
  2. abb. key retaining

KWY

abb. keyway


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layout board

n. see "layout tray"

layout tray

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

lazy cam/tailpiece

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

level (of a cut)

n. 1. see "bitting depth"

2. see "root depth"

levels of keying

n. pl. the divisions of a masterkeysystem into hierarchies of access, as shown in the following tables. Note that the standard key coding system has been expanded to include key symbols for systems of more than four levels of keying.

system level

level of keying

key name

abb.

key symbol

TWO LEVEL SYSTEM

Level II master key MK AA
Level I change key CK 1AA, 2AA, etc.

THREE LEVEL SYSTEM

Level III grand master key GMK A
Level II master key MK AA, AB, etc.
Level I change key CK AA1, AA2, etc.

FOUR LEVEL SYSTEM

Level IV great grand master key GGMK GGMK
Level III grand master key GMK A, B, etc.
Level II master key MK AA, AB, etc.
Level I change key CK AA1, AA2, etc.

FIVE LEVEL SYSTEM

Level V great great grand master key GGGMK GGGMK
Level IV great grand master key GGMK A, B, etc.
Level II grand master key GMK AA, AB, etc.
Level II master key MK AAA, AAB, etc.
Level I change key CK AAA1, AAA2, etc.

SIX LEVEL SYSTEM

Level VI great great great grand master key GGGMK GGGMK
Level V great great grand master key GGMK A,B, etc.
Level IV great grand master key GMK AA, AB, etc.
Level III grand master key MK AAA, AAB, etc.
Level II master key SMK AAAA, AAAB, etc.
Level I change key CK AAAA1, AAAA2, etc.

lever tumbler

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

loading tool

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

lockout

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

lockout key

n. 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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MACS

abb. maximum adjacent cut specification

maid's master key

n. 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.

maintenance master key

n. see "engineer's key"

maison key system

n. [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

manipulation key

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

master

n. see "master key " #1

master blank

n. 1. see "multi-section key blank"

2. see "all-section key blank"

master chip

n. see "master pin" #1

master disc

n. 1. see "master pin" #1

2. see "stepped tumbler"

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

master key

1. n. a key which operates all the master keyed locks or cylinders in a group, each lock or cylinder usually operated by its own change key

2. v. 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

master key changes

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

master key constant

n. see "constant cut" #1

master key section

n. 1. see "multi-section key blank"

2. see "all-section key blank"

master key system

n. 1. any keying arrangement which has two or more levels of keying

2. a keying arrangement which has exactly two levels of keying

master keyed

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

master keyed only

adj. of or pertaining to a lock or cylinder which is or is to be combinated only to a masterkey

master keying

v. see "master key" #2

master lever

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

master pin

n. 1. usually a cylindrical shaped tumbler, flat on both ends, placed between the top and bottom pin to create an additional shear line

2. a pin tumbler with multiple gates to accept a sidebar

master ring

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

master ring lock/cylinder

n. a lock or cylinder equipped with a master ring

master wafer

n. 1. see "master pin" #1

2. see "stepped tumbler"

3. a ward used in certain binary type disc tumbler key-in-knob locks

maximum adjacent cut differential

n. see "maximum adjacent cut specification"

maximum adjacent cut specification

n. the maximum allowable difference between adjacent cut depths

maximum opposing cut specification

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

milling (of a key)

n. 1. see "key section"

2. see "key milling"

mis-cut

  1. ad. of or pertaining to a key which has been cut incorrectly
  2. n. a mis-cut key

MK

abb. master key

MK'd

abb. master keyed

MK'd only

abb. master keyed only

MK section

abb. master key section

mocs

abb. maximum opposing cut specification

mogul cylinder

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

mortise cylinder

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

mortise cylinder blank

n. see "cylinder blank"

movable constant

n. see "rotating constant"

multi-section key blank

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

multiple gating

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

multiplex key blank

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

multiplex key system

n. 1. a series of different key sections which may be used to expand a master key system by repeating bittings on additional key sections. The keys of one key section will not enter the keyway of another key section. This type of system always includes another key section which will enter more than one, or all of the keyways.

2. a keying system which uses such keyways and key sections

mushroom driver

n. see "mushroom pin"

mushroom pin

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


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NCK

symbol for "no change key," pimarily used in hardware schedules

negative locking

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

NKH

abb. non key retaining

NMK

a key 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 key(s) specified in the regular key symbol; e.g., AB6(NMK).

non key retaining

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

non-keyed

adi. having no provision for key operation

NOTE: This term also includes privacy function locksets operated by an emergency key.

non-original key blank

n. any key blank other than an original key blank


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0 bitted

adj. see "zero bitted"

odometer method

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

one bitted

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

one column progression

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

one pin master key

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

position

open code

n. see "direct code"

operating key

n. 1. 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

2. see "change key" #1

original key

n. 1. see "factory original key"

2. see "code original key"

original key blank

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


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page master key

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

paracentric

adj. 1. of or pertaining to a keyway with one or more wards on each side projecting beyond the vertical center line of the keyway to hinder picking

2. of or pertaining to a key blank made to enter such a keyway

pattern key

n. 1. an original key kept on file to use in a key duplicating machine when additional keys are required

2. any key which is used in a key duplicating machine to create a duplicate key

peanut cylinder

n. a mortise cylinder of 3/4" diameter

phantom key

n. see "incidental master key"

pick

1. n. a tool or instrument, other than the specifically designed key, made for the purpose of manipulating tumblers in a lock or cylinder into the locked or unlocked position through the keyway, without obvious damage

2. v. to manipulate tumblers in a keyed lock mechanism through the keyway, without obvious damage, by means other than the specifically designed key

pick key

n. a type of manipulation key, cut or modified to operate a lock or cylinder

pin

  1. n. see "pin tumbler"
  2. v. to install pin tumblers into a cylinder and/or cylinder plug

pin cell

n. see "pin chamber"

pin chamber

n. the corresponding hole drilled into the cylinder shell and/or plug to accept the pin(s) and spring

pin kit

n. a type of keying kit for a pin tumbler mechanism

pin segment

n. see "pin tumbler"

pin set

v. see "pin" #2

pin stack

n. 1. all the tumblers in a given pin chamber

2. see "pin stack height"

pin stack height

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

pin tray

n. see "layout tray"

pin tumbler

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

pin tweezers

n. pl. a tool used in handling tumblers and springs

pinning

v. see "pin" #2

pinning block

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

pinning chart

n. 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.

plug

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

plug follower

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

plug holder

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

plug iron

n. 1. see "plug follower"

2. see "set-up plug"

plug retainer

n. the cylinder component which secures the plug in the shell

plug set-up chart

n. see "pinning chart"

plug vise

n. see "plug holder"

positional master keying

n. 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

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

practical key changes

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

prep key

n. 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.

privacy key

n. 1. a key which operates an SKD cylinder

2. see "emergency key" #2

profile

n. 1. see "key section"

2. see "keyway" #2

profile cylinder

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

program key

n. see "reset key" #1

progress

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

progression

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

progression column

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

progression formula

n. see "key bitting array"

progression list

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

progression sequence

n. see "sequence of progression"

progressive

n. any bitting position which is progressed rather than held constant

proprietary

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

quadrant master key

n. see "four pin master key"


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radiused blade bottom

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

random master keying

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

rap

v. 1. to unlock a plug from its shell by striking sharp blows to the spring of the cylinder while applying tension to the plug

2. to unlock a padlock shackle from its case by strikng sharp blows to the sides in order to disengage the locking dogs

read key

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

recode

v. see "recombinate"

recombinate

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

recore

v. to rekey by installing a different core

register groove

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

register number

n. 1. a reference number, typically assigned by the lock manufacturer to an entire master key system

2. a blind code assigned by some lock manufacturers to higher level keys in a master key system

rekey

v. to change the existing combination of a cylinder or lock

removable core

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

removable cylinder

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

removal key

n. 1. the part of a two-piece key which is used to remove its counterpart from a keyway

2. see "control key" #1 and #3

3. see "construction breakout key"

renters key

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

repin

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

reserved

adj. see "restricted"

reset

v. see "recombinate"

reset key

n. 1. a key used to set some types of cylinders to a new combination. Many of these cylinders require the additional use of tools and/or the new operating key to establish the new combination.

2. a key which allows the tabulations on various types of cash control equipment (e.g., cash registers) to be cleared from the records of the equipment

restricted

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

retainer

n. see "plug retainer"

reversible key

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

rim cylinder

n. 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.

rocker key

n. see "manipulation key"

root depth

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

root of cut

n. see "cut root"

rose

n. a usually circular escutcheon

rotary tumbler

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

rotating constant

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

rotating constant method

n. a method used to progress key bittings in a master key system, wherein at leastone cut in each key is identical to the corresponding cut in the top master key. The identical cut(s) is moved to different locations in a logical sequence until each possible planned position has been used.

row master key

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


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S/A

abb. sub-assembled

safety factor

n. see "maximum adjacent cut specification"

sample key

n. see "pattern key"

scalp

n. 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.

schematic

n. see "key system schematic"

second generation duplicate

n. a key reproduced from a first generation duplicate

sectional key blank

n. see "multiplex key blank"

sectional keyway system

n. see "multiplex key system"

security collar

n. 1. a protective cylinder collar

2. see "cylinder guard"

segmented follower

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

selective key system

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

selective master key

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

sequence of progression

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

series wafer

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

set

v. see "combinate"

set-up key

n. a key used to calibrate some types of key machines

set-up plug

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

seven column progression

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

seven pin master key

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

shaved blade

n. see "radiused blade bottom"

shear line

n. a location in a cylinder at which specific tumbler surfaces must be aligned, removing obstruction(s) which prevented the plug from moving

shedding key

n. see "declining step key"

shell

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

shim

1. n. a thin piece of material used to unlock the cylinder plug from the shell by separating the pin tumbers at the shear line, one at a time

2. v. to unlock a cylinder plug fi-om its shell by using a shim

shoulder

n. 1. any key stop other than a tip stop

2. see "bow stop"

shouldered pin

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

shove knife

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

shut out key

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

shut out mode

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

shutter

n. see "dust cover"

sidebar

n. a primary or secondary locking device in a cylinder. When locked, it extends along the plug beyond its circumference. It must enter gates in the tumblers in order to clear the shell and allow the plug to rotate.

simplex key section

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

single key section

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

single step progression

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

six column progression

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

six pin master key

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

SKD

symbol for "single keyed," normally followed by a numerical designation in the standard key coding system; e.g., SKD1, SKD2, etc. It indicates that a cylinder or lock is not master keyed but is part of the keying system-

skew

n. see "degree of rotation"

slide

n. see "spring cover"

SMK

abb. sub-master key

spacing

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

special application cylinder

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

split pin

n. see "master pin" #1

split pin master keying

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

spool pin

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

spring cover

n. a device for sealing one or more pin chambers

stack height

n. see "pin stack height"

standard key coding system

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

standard progression format

n. 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.

step

n. see "increment"

step pin

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

step tolerance

n. see "maximum adjacent cut specification"

stepped tumbler

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

stop (of a key)

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

sub-assembled

adj. see "uncombinated" #1

sub-master key

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


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tailpiece

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

template keys

n. pl. see "depth key set"

theoretical key changes

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

thimble

n. see "plug holder"

threaded cylinder

n. see "mortise cylinder"

three column progression

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

three pin master key

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

thumb turn cylinder

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

tip

n. the portion of the key which enters the keyway first

tip stop

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

tolerance

n. the deviation allowed from a given dimension

top master key

n. the highest level master key in a master key system

top of blade

n. the bitted edge of a single bitted key

top pin

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

total position progression

n. 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

total stack height

n. see "pin stack"

trim ring

n. 1. see "cylinder collar"

2. see "rose"

try-out key

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

tubular key

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

tumbler

n. 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

tumbler spring

n. any spring which acts directly on a tumbler

two column progression

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

two pin master key

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

two step progression

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


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UL

abb. Underwriters Laboratories

unassociated change key

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

unassociated master key

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

uncoiled

adj. see "uncombinated"

uncombinated

adj. 1. of or pertaining to a cylinder which is or is to be supplied without keys, tumblers and springs

2. of or pertaining to a lock, cylinder or key in which the combination has not been set

uncontrolled cross keying

n. a condition in which two or more different keys under different higher level keys operate one cylinder by design; e.g, XAA1 operated by AB, AB1

NOTE: This condition severely limits the security of the cylinder and the

maximum expansion of the system, and often leads to key interchange

unidirectional cylinder

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

universal keyway

n. see "composite keyway"

vertical group master key

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

VGM

abb. vertical group master key

visual key control

n. a specification that all keys and the visible portion of the front of all lock cylinders be stamped with standard key code symbols

VKC

abb. visual key control

wafer

n. 1. see "disc tumbler"

2. see "master pin" #1

ward

n. a usually stationary obstruction in a lock or cvlinder which prevents the

entry and/or operation of an incorrect key

ward cut

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

wiggle key

n. see "manipulation key"

x

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

zero bitted

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


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