C label
n. a classification by Underwriters Laboratories for doors with 3/4 hour rated fire protection
cabin-door hook
n. a U-shaped latch that pivots to encircle a strike projection
cable wired remote relocker
n. a spring loaded relock, triggered by release of the attached wire
n. 1. a lock or cylinder component which transfers the rotational motion of a key or cylinder plug to the bolt works of a lock 2. the bolt of a cam lock
cam lock
n. a complete locking assembly in the form of a cylinder whose cam is the actual locking bolt
cane bolt
n. a surface mounted deadbolt designed to be moved by hand via a 90 bend in the bolt that serves as a handle
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
captains wheel
n. 1. a spoked handle on a safe used to extend or retract the bolts, 2. a spoked handle on a safe used to engage or disengage the pressure system
captured combination bit position
n. the position where a movable key insert is placed on a key
captured hinge
n. a hinge system for safes where the door may not be lifted off the body of the safe without the removal of one of the hinge blocks
card access system
n. an access control system that utilizes a controlled security card as the credential
card holder
n. a person to whom a card has been issued
card reader
n. a device which interprets coding resident on or in cards
n. 1. the movable assembly of a key machine which supports the key vise(s), 2. a changeable part of a clipper that holds the key blank
carry bar
n. the part of a multi-bolt safe boltworks to which the bolts are attached
n. the housing or body of a lock
case cover
n. the portion of a lock case which is designed to be removable to allow access to the mechanism
casement window
n. a window with a sash which pivots or swings to open
case ward
n. any ward directly attached to or projecting from a lock case
n. any device that holds a door closed and may be released by simply pushing or pulling on the door
abb. construction breakout key
abb. Counter Clockwise, as used in combination dialing instructions
central processing
adj. of or pertaining to an access control system in which all or most control functions are performed by the main computer
central station
n. a location designed for the express purpose of processing status signals for multiple alarm systems
certificate of occupancy
n. a document, granted by the authority having jurisdiction, permitting occupancy or use
chain bolt
n. a spring biased bolt operated by an attached chain, typically for mounting to the top of a door
chain lock
n. a device used to secure property with interlocking links and secured on both ends by a slide plate or a key locking device
n. any cavity in a cylinder plug and/or shell which houses the tumblers
change index
n. the point on a key changeable combination lock dial ring to which the old and new combinations must be dialed when changing the combination
change key
n. 1. a key which operates only one cylinder or one group of keyed alike cylinders in a keying system, 2. any device that is used to mechanically or electronically allow resetting of certain key or combination locks, see also "reset key" #1
changeable bit key
n. a key which can be recombinated by exchanging and/or rearranging portions of its bit or blade
changeable fence
n. the fence of a lever tumbler lock composed of multiple segments which may be set to various positions in order to change the combination of the lock
changeable lever
n. a lever tumbler typically made in two or more pieces which can be variably positioned with each other to change the effective location of the gate
changeable tumbler
n. a tumbler whose reference size can be changed mechanically without removal from the lock or cylinder
n. the part of a cylindrical lockset that contains the actuating mechanism and has a means for mounting trim and a bolt
check pin
n. a device resembling a bottom pin, found in a non-traditional chamber, used to restrict the rotation of the plug unless a specific area of the key is cut
n. a projection from a lock case that serves as a guide or race for another part
Chubb shackle
n. a hinged shackle with a pierced hole for the bolt in its movable end
abb. the title "Certified Institutional Locksmith" as awarded by ILA
circular strike
n. a typically round, finished strike, usually driven into place in a drilled hole
abb. the title "Certified Journeyman Institutional Locksmith" as awarded by ILA
abb. the title Certified Journeyman Locksmith as awarded by the Professional Locksmith Association of Alberta
abb. the title "Certified Journeyman Safecracker" as awarded by NSO
1. abb. change key 2. abb. control key
n. an outer casing, usually metallic, typically filled with concrete to protect a safe against theft or penetration
n. the two piece housing (usually plastic) that encases the upper steering column and ignition lock on some automotive applications
claw bolt
n. 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
clear opening
n. a portal providing clearance through which passage is unhampered
n. a device to permanently attach a chain to a padlock
n. a hand held key bitting punch, often incorporating a trigger-like handle
closed gated
adj. pertaining to a lever tumbler whose gate is pierced into the body of the tumbler. The lever(s) surround the fence in both the locked and unlocked positions.
closed knob
n. a knob without an opening in its face
closed loop
n. a detection circuit where discontinuity in a branch will result in a reportable condition
closer size
adj. a numerical value related to the applied force of a door closer, with a larger number being a stronger force. Older closers were assigned alphabetic size designations, where A was the smallest.
closet latch
n. a latchset which has a turning device with minimum projection in place of the inside knob or lever
closet spindle
n. a spindle with a thumbturn attached to one end
closing combinated
adj. pertaining to a lever lock which is automatically combinated to the last key to extend the bolt
cloverleaf cam
n. a style of mortise cylinder cam with three lobes: a ball shaped longer center, and angular projections on either side
n. 1. the part of a profile cylinder which transfers rotational motion from the inside or outside element to a common cam or actuator, 2. the feature of a lever handle lockset which allows free movement of the lever when locked, 3. the feature of a cylinder which allows turning the plug without operation of the lock when a certain pressure is applied without the correct key
abb. the title "Certified Master Institutional Locksmith" as awarded by ILA
abb. construction master key
abb. construction master keyed
abb. the title "Certified Master Locksmith" as awarded by ALOA
abb. the title "Certified Master Safecracker" as awarded by NSO
abb. the title "Certified Master Safe Technician" as awarded by SAVTA
abb. certificate of occupancy
n. 1. 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. a standard for Life Safety, structural integrity, fire safety, etc., either incorporated into the statutes of a given jurisdiction, or a model standard
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 original key
n. a code key which conforms to the lock manufacturer's specifications
code series
n. an ordered sequence of unique codes related to specific key combinations, key sections and manufacturers
adj. the measure (usually expressed in Oersteds) of a magnetic material's resistance to being recorded or erased. Magnetic stripe cards are either low coercivity or high coercivity.
v. the process of pressing metal between two dies in order to form a raised image and markings. Generally related to the bow of a key.
comb attack
n. 1. a pin tumbler defeat tactic using a series of straight pins or teeth on a single tool, intended to push the pin stack past the shear line, 2. a defeat tactic used to force a spring cover off a pin tumbler cylinder
v. to set a combination in a lock, cylinder, or key
n. the group of numbers which represent the bitting of a key and/or the tumblers of a lock or cylinder
combination lock
n. a lock which is operated by local input of a specific series or sequence of numbers or letters
combination wafer
n. a type of disc tumbler used in certain binary type disc tumbler key-in-knob looks. Its presence requires that a cut be made in that position of the operating key(s)
combination wheel
n. a wheel type tumbler in a combination lock
compensate drivers
v. 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
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 blank
n. a blank designed to enter two or more simplex keyways
composite keyway
n. a keyway which has been enlarged to accept more than one key section, often key sections of more than one manufacturer
compound bitted key
n. a key with at least one compound cut
compound cut
n. a bitting which has another bitting dimension within its dimensions
compound lever
n. a lever tumbler that has two or more distinct sweeps contacted by two or more different keys
concealed key control
n. a specification that all keys and the non-visible portion of all lock cylinders be stamped with standard keying symbols
concealed screw rose
n. KIK or KIL trim that snaps into place to hide mounting screws
concealed shell cylinder
n. a specially constructed (usually mortise) cylinder. Only the plug face is visible when the lock trim is in place
concealed vertical rod exit device
n. a vertical rod exit device whose rods and header/threshold bolts are concealed within the door
concrete case
n. an enclosure for mounting a floor closer
configured pin
n. a bottom pin which is designed not to rotate along its long axis, often associated with off-centerline chambers 
constant cut
n. 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. See also "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 hole
n. a recess or pocket designed to receive ball bearings in lost-ball keying. The size and/or shape of the recess is such that a pin tumbler cannot enter it.
construction master key
n. a key normally used by construction personnel for a temporary period during building construction. It may be rendered permanently inoperative without 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
contact area
n. the gate area in a combination lock drive cam where the lever nose does not contact the drive cam
contact point(s)
n. the area on each side of the drive cam gate that the lever nose makes contact with. Most locks have a left contact point and a right contact point.
contact switch
n. a electrical, magnetic or mechanical device that triggers a circuit(s) to open or closed depending on the application
contactless smart card
n. a card, conforming to the physical characteristics specified in ISO 7813 & 10536, which contains one or more integrated circuits and does not use contacts to obtain power and allow interface to external equipment
continuous duty
adj. designed to sustain application of power for extended periods
control additive
n. the numeric value of the thickness of the control sleeve expressed in increments relative to the A2, A3 or A4 format being used
control chamber
n. in an interchangeable or removable core, any chamber which has a control shear line, which is different from the operating shear line
control cut
n. any bitting which operates the retaining device of an interchangeable or removable core
control dimension
n. 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
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 number
n. a number used to calculate the size of the build-up pin when; (a) the sizes of bottom and master pins are known, or (b) the bitting depths of all operating keys are known
control shear line
n. the shear line which allows operation of the control lug of an interchangeable or removable core
control sleeve
n. the part of an interchangeable or removable 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 AB1)
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.
n. a device that has decision making capability by way of authentication or lookup in a database. It serves a control function by having output relays or other interfaces with other devices which may include other controllers, electric strikes, alarms, or printers.
convertible dial
n. a dial that is designed to readily accept a key locking core at any time
n. in conjunction with a pair of doors, a device designed to cause the inactive leaf to close first
n. a complete unit, often with a "figure eight" shape, which usually consists of the plug, shell, tumblers, springs, plug retainer and spring cover(s). It is primarily used in removable and interchangeable core cylinders and locks.
corner bracket
n. a door closer mounting plate attached to the upper corner of the jamb
covert entry
n. the use of entry or bypass techniques that can only be detected via disassembly and/or detailed inspection of lock components
abb. the title "Certified Professional Locksmith" as awarded by ALOA
abb. the title "Certified Protection Professional" as awarded by ASIS
abb. the title "Certified Professional Safe Technician" as awarded by SAVTA
crane hinge
n. a three leaf hinge assembly with two of the leaves being mounted to the body and door and the third only to the other two leaves
abb. the title "Certified Registered Locksmith" as awarded by ALOA
n. any authorizing instrument, other than a mechanical key, that can cause entry to be allowed
cremone bolt
n. a surface mounted, top and bottom locking, deadbolt mechanism operated by a central handle
n. a hole drilled into the face of a door where a bored or interconnected lockset is to be installed
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."
adj. of or pertaining to a key section or keyway which usually resembles a plus sign (+) or the letter "X"
abb. Construction Specifiers Institute
n. a sleeve mounted around a steering column to protect the column
cup escutcheon
n. lock trim that creates a recess in a door face and does not protrude beyond the door face
cup handle
n. a fitting recessed into a door surface to provide a finger grip with which to move the door
cupboard latch
n. a latching mechanism typically surface mounted to the outside of cabinet doors or drawers
n. a round safe lock cover that is rabbeted and has a wheel post as an integral part of its construction
curb post
n. a wheel post attached to a curb
curtain (British)
n. in a lever tumbler lock, a device that blocks access to the keyhole when the key is turned
curved lip strike
n. a strike so shaped as to effect smoother function of the latch while the door is closing
v. to make cuts into a key blade, see also "key cut(s)"
cut angle
n. a measurement, usually expressed in degrees, for the angle between the two sides of a key cut, see also "degree of rotation"
1. adj. of or pertaining to a device with material removed or a transparent cover to expose and demonstrate a mechanism or feature 2. n. any cutaway product
cut edge
n. the portion of the key blade which contains the cuts
cut key
n. a key which has been bitted or combinated
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"
n. the part of a key machine which makes the cuts into the key blank
cutter guard
n. a shield over a key machine cutter to protect the operator
abb. Clockwise, as used in combination dialing instructions
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 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 keys for pin and disc tumbler locks
cylinder lock
n. any lock that is operated by a cylinder key
cylindrical lockset
n. a bored lockset whose latch or bolt locking mechanism is contained in the portion installed through the cross-bore


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

This listing of the Locksmith Dictionary is courtesy of