Lock & Security Hardware Glossary
160 prep
n. a standard door preparation that 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.
161 prep
n. a standard door preparation that consists of a 2-1/8" cross-bore with a 2-3/4" backset, and a 1" edge-bore with a mortise 1-1/8" wide and 2-1/4" high.
A2
n. an increment of .0125 typically used in a small format interchangeable core (SFIC).
A3
n. an increment of .018 typically used in a small format interchangeable core (SFIC).
A4
n. an increment of .021 typically used in a small format interchangeable core (SFIC).
AC Current
n./abbr. (AC) Alternating current. This is the type of current generally associated with that which power companies supply to your home or business to operate lights, equipment and other standard plug-in style devices.
access control
n. a locking system employing electronics that may have audit trail, time and date discrimination, or lock mode indication capabilities. Note: You can have a mechanical access control lock system (ex: Simplex®1000 series).
access level
v. The door or combination of doors and/or barriers an individual is authorized to pass through.
alternate action
v. In the electric locking industry this defines a switching device that once mechanically actuated remains in the active state until actuated again. This is also referred to as maintained.
annunciator
n. An audible and/or visual signaling device
accessory position
n. the position of an ignition switch intended to permit the use of radio or other equipment without turning on a drive chain component.
active leaf
n. the single door of a pair on that the active or locking hardware is mounted.
actuator
n. a device, connected to a cylinder, that, when activated, may cause a lock mechanism to operate.
ADA™
abbr. Americans with Disabilities Act™.
adjustable collar
n. a spring-loaded cylinder collar that can fill a range of gaps between the cylinder head and the door escutcheon surface.
after hours depository
n. a locked receptacle for the deposit of items after regular hours.
AHD
abbr. after hours depository.
AHJ
abbr. authority having jurisdiction.
alarm system
n. a system of electrical and/or electronic components, which detect and report dangers, such as fire or intrusion.
aligning tube
n. 1. a lock component that orients and joins the latch and knob spindles of certain bored locksets. 2. in some combination locks, a tube that houses the spindle, located between the dial ring and the lock.
ALOA®
abbr. Associated Locksmiths of America, Inc™.
Americans with Disabilities Act™
n. a U.S. Federal Law dealing with minimum standards of building accessibility, as well as other issues concerning individuals with disabilities.
ANSI®
abbr. American National Standards Institute™.
ANSI®117.1
n. that section of the American National Standards Institute® documents pertaining to handicap access.
ANSI®strike
n. any of many strikes designed to fit door and frame preparations as specified in the applicable document in the ANSI® A115 series, common usage refers to a strike with dimensions of 4-7/8" x 1-1/4".
anti friction
adj. pertaining to a feature, which, upon contact with the strike, allows smoother operation of a latch bolt.
architectural hardware
n. hardware used in building construction, especially that used in connection with doors.
assembly occupancy
n. those buildings or areas that are designated as places of assembly according to life safety or building codes.
astragal
n. a molding attached to the face of the active leaf of a pair of doors and overlapping the inactive leaf, typically used for security purposes on non-rated openings or fire/smoke control on rated openings.
ATM
abbr. automatic teller machine.
ATT
abbr. symbol for attendant's key.
attendant's key
n. a selective master key used in a hospital keying system.
audit trail
n. a specific group of events selected from transaction records and listed sequentially.
authority having jurisdiction
n. that person, usually within a municipality, charged with the application and interpretation of local fire/life safety and accessibility (ADA™) codes.
automatic deadbolt
n. a deadbolt designed to extend itself fully when the door is closed.
automatic flush bolt
n. a flush bolt designed to extend itself when both leaves of the pair of doors are in the closed position.
automatic teller machine (ATM)
n. a device for dispensing cash, receiving deposits and performing other banking functions upon presentation of the proper authorization.
auxiliary lock
n. any lock installed in addition to the primary lock.
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.
backcheck
n. the resistance provided by a door closer as a door is opened.
backset
n. the distance between the center of a cross-bore and the bolt edge of a door or drawer.
ball locking
adj. a method of locking a padlock shackle into its case using ball bearing(s) as the bolt(s).
barrel bolt
n. a surface mounted slide bolt that has a cylindrical shape.
barrier free
n. having to do with the absence of restrictions to access by the handicapped.
Barron, Robert
n. the Englishman credited with the invention of the double acting lever tumbler in 1778.
Basic Building Code
n. former name for BOCA®National Building Code.
battery eliminator
n. an electric device designed to provide energy to equipment normally requiring batteries for operation.
bell box
n. the protective enclosure for a bell or other alarm-sounding device.
bevel (of a door)
n. the pitch on the leading edge of a door that allows clearance for closing.
bevel (of a lock)
n. the pitch of the face designed to match the bevel of a door, some locks have an adjustable bevel.
bezel
n. a threaded collar commonly used to secure certain cylinder of lock assemblies.
BHMA™
abbr. Builders Hardware Manufacturers Association™.
Bi-Directional
n. This defines a door that can swing in both directions into or out of the secure area.
Bi-Parting
n. This defines a double door in which one door leaf swings into the secure area and one leaf swings out of the secure area.
bible
n. that portion of the cylinder shell that normally houses the pin chambers, especially those of a key-in-knob cylinder or certain rim cylinders.
bicycle padlock
n. a padlock with sufficient shackle clearance to secure a bicycle.
biometric
adj. of or pertaining to a lock with a hybrid mechanism, part of the mechanism identifies a physical attribute such as finger print, voice print, etc. while another part is a mechanical mechanism.
bit
n. 1. the part of the key that serves as the blade, usually for use in a warded or lever tumbler locks. --v. 2. to cut a key.
bit key
n. a key with one or more projecting bits.
bitting
n. 1. the number(s) that represent(s) the dimensions of the key. 2. the actual cut(s) or combination of a key.
bitting depth
n. the depth of a cut that 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. the location of a cut on a key.
blade
n. the portion of a key that may contain the cuts and/or millings.
blank
adj. uncut. See also: "key blank".
BOCA™
abbr. Building Officials and Code Administration International™.
BOCA®National Building Code
n. the model building code developed and published by BOCA®.
bolt
n. any movable projection that blocks the movement of one object relative to another.
boltwork button
n. the component that automatically triggers extension of the locking bolt(s) when the door is in the closed position.
BondSTAT
n. Securitron’s monitoring system that is available on most magnetic locks. Unlike conventional switches that indicate if the door is closed, BondSTAT also notifies the access control or alarm system that the door is secure.
bored lock
n. a lock for a door prepared with one or more cross-bores and one or more edge-bores.
boring jig
n. a tool, which is temporarily affixed to a door, that provides a template structure to guide drill bits properly when preparing for the installation of specific hardware.
bottom of blade
n. the portion of the blade opposite the cut edge of a single bitted key.
bottom pin
n. a cylindrical shaped tumbler that may be conical, ball shaped, or chisel pointed on the end that makes contact with the key.
bow
n. the portion of the key that serves as a grip or handle.
bow stop
n. a type of stop located near the key bow. It stops the key from entering the keyway further than the manufacturer has designed, thus properly aligning the key cuts with the tumblers on a key that is cut for the given lock.
box of wards
n. a complete unit of intricate wards installed in or on a lock case.
box strike
n. a strike equipped to line the bolt cavity for both aesthetic and protective purposes.
Bramah, Joseph [bram'u, brä'–]
n. 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.
bridge ward
n. a center ward attached to the interior of a lock by means of a bracket.
Bramah type lock
n. a lock or cylinder using a mechanism with sliders, normally arranged in a circle.
build up dimension
n. 1. the distance between two different shear lines, as expressed in units of the manufacturer's increment or as an actual measurement. 2. the dimension of the buildup pin required in a particular chamber that will allow one key to operate at the plug shear line and a different key to operate at a different shear line.
build up pin
n. the additional element of a pin stack required to allow operation at different shear lines in a cylinder.
bump key
n. A key that is modified from its original condition and slightly bumped once inserted into a lock while turning with slight pressure. Used to bypass the need for the proper key, therefore it is considered to be a burglary tool and, unless the holder of a bump key has a license, they could be fined and/or imprisoned.
bypass key
n. the key that operates a key override cylinder.
bypass button
n. pertaining to electrically-controlled locking devices, a button that is connected to an electric strike, magnetic lock or other electrical lock that, when depressed, allows the lock to disengage thus allowing acesss through a controlled door.
bypass tool
n. a device that neutralizes the security of a locking device, or its application hardware, often taking advantage of a design weakness.
cam
n. 1. a lock or cylinder component that 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.
cap
n. 1. a spring cover for a single pin chamber. 2. a part that may serve as a plug retainer and/or a holder for the tailpiece. --v. 3. to install a cap.
capping block
n. a holding fixture for certain interchangeable cores that aids in the installation of the caps.
card reader
n. a device that interprets coding resident on or in cards. Generally used in conjunction with other electrical devices.
case
n. the housing or body of a lock.
case cap
n. the scalp of an automotive cylinder.
case cover
n. the portion of a lock case that is designed to be removable to allow access to the mechanism.
case ward
n. any ward directly attached to or projecting from a lock case.
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.
chamber
n. any cavity in a cylinder plug and/or shell that 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. See also: "index".
change key
n. a key that operates only one cylinder or one group of keyed alike cylinders in a keying system.
Chubb shackle
n. a hinged shackle with a pierced hole for the bolt in its movable end.
claw bolt
n. a bolt with one or more fingers that 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 .
clevis
n. a device to permanently attach a chain to a padlock.
clipper
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.
closet spindle
n. a spindle with a thumbturn attached to one end.
closet latch
n. a latchset which has a turning device with minimum projection in place of the inside knob or lever.
CML
abbr. the title "Certified Master Locksmith" as awarded by ALOA®.
CO
abbr. certificate of occupancy.
code
n. a designation assigned to a particular key combination for reference when additional keys or cylinders may be needed. See also: "direct code", and "key symbol".
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.
combinated
adj. 1. of or pertaining to a cylinder that is or is to be supplied with keys, tumblers and springs. 2. of or pertaining to a lock, cylinder or key in that the combination has been set.
combination
n. the group of numbers that represent the bitting of a key and/or the tumblers of a lock or cylinder.
composite keyway
n. a key that 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.
concealed vertical rod 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.
construction core
n. an interchangeable or removable core designed for use during the construction phase of a building; cores are normally keyed alike (KA) 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; may be rendered permanently inoperative without disassembling the cylinder.
construction master keyed
adj. of or pertaining to a cylinder that is or is to be operated temporarily by a construction master key.
continuous duty
adj. designed to sustain application of electrical power for extended periods.
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 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 that allows disassembly of some removable cylinder locks.
control shear line
n. the shear line that 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 that surrounds the plug.
coordinator
n. used in conjunction with a pair of doors, a device designed to cause the inactive leaf to close first.
core
n. a complete unit, often with a ‘figure eight’ shape, that usually consists of the plug, shell, tumblers, springs, plug retainer, and spring cover(s); 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.
CPL
abbr. the title "Certified Professional Locksmith" as awarded by ALOA®.
CRL
abbr. the title "Certified Registered Locksmith" as awarded by ALOA®.
cross-bore
n. a hole drilled into the face of a door where a bored or interconnected lockset is to be installed.
cruciform
adj. of or pertaining to a key section or keyway that usually resembles a plus sign (+) or the letter "X".
curved lip strike
n. a strike so shaped as to effect smoother function of the latch while the door is closing.
cut
v. to make cuts into a key blade. See also: "key cut(s)".
cutaway
adj. 1. of or pertaining to a device with material removed or a transparent cover to expose and demonstrate a mechanism or feature. --n. 2. any cutaway product.
cut key
n. a key that has been bitted or combinated.
cutter
n. the part of a key machine that makes the cuts into the key blank.
cylinder
n. a complete operating unit that usually consists of the plug shell, tumblers, springs, plug retainer, a cam/tailpiece, or other actuating device and all other necessary 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.
cylindrical lockset
n. a bored lockset whose latch or bolt locking mechanism is contained in the portion installed through the cross-bore.
day gate
n. a barrier used to restrict passage during normal business hours, normally used at a vault entrance.
day key
n. 1. the key for a day gate or day operation of a safe or vault lock. 2. a cash register key that does not allow audit or reset functions. See also: "change key".
day lock
n. a secondary lock used to restrict entry during normal business hours while the primary locking device is unlocked.
DC Current
n./abbr. (DC). Direct Current. This is the type of current supplied by batteries, usually used for backup purposes with magnetic locking devices.
deadbolt
n. a bolt, that requires a deliberate action to extend, and that resists end pressure in the unlocking direction when fully extended.
deadlock
n. a lock that incorporates a deadbolt.
deadlocking
adj. pertaining to any feature, that, when fully engaged, resists attempts to move the latch, or bolt in the unlocking direction through direct pressure.
deadlocking latch
n. a latch bolt with a deadlocking mechanism.
decoder gauge
n. a measuring device which helps determine the combination of a lock or cylinder without removing the tumblers.
delayed egress device
n. A device that precludes the use of exits for a predetermined period of time.
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.
DHI®
abbr. Door and Hardware Institute™.
dialer
n. 1. a device that automatically places a telephone call to a pre set number when activated. --n. 2. an electro mechanical device that systematically tries different combinations on a dial operated combination lock.
diamond back
adj. pertaining to a rim cabinet lock whose mounting flanges and case forms the general shape of a diamond.
diamond pick
n. a tumbler manipulation device with a triangular protrusion at its tip.
dimple key
n. a key whose cuts are drilled or milled into its blade surfaces; cuts normally do not change the blade silhouette.
direct code
n. a designation assigned to a particular key that includes the actual combination of the key.
disc tumbler
n. 1. a flat tumbler that must be drawn into the cylinder plug by the proper key so that none of its extremities extends into the shell. 2. a flat, rectangular tumbler with a gate that must be aligned with a sidebar by the proper key.
dog
v. 1. to place an exit device in the holdback mode. --n. 2. in marine applications the latch for the hatch.
dogging cylinder
n. a key operated cylinder used to dog an exit device.
dogging key
n. a key or tool used to dog an exit device.
dogging screw
n. a screw used to dog an exit device.
door closer
n. a device that controls the opening, closing or position of a door. See also: "door control".
door control
n. any device that controls the opening, closing or position of a door. See also: "door closer".
door silencer
n. a bumper installed in the jamb stop to quiet the closing of a door.
double acting hinge
n. a hinge that permits movement of a door in either direction from the closed positions.
double acting lever tumbler
n. one that must be lifted a precise amount, neither too little nor too much to allow movement of a bolt.
double bitted key
n. a key bitted on two opposite surfaces.
double cylinder
adj. pertaining to a lock with two keyed cylinders.
double cylinder deadlock
n. a deadbolt lock whose bolt may be operated by a key from either side.
double-D
n. 1. a shape consisting of two opposing arcs and two opposing flats. --adj. 2. having such a shape.
double-D punch
n. a tool used to make a double-D hole.
drilled key
n. a type of bit key with a hole drilled into the shank from the tip.
drive-in
adj. pertaining to a latch or bolt with a round face.
driver spring
n. a spring placed on top of the pin stack to exert pressure on the pin tumblers.
drop bolt
n. a lock with an interlocking bolt which moves vertically and may enter loops on the strike.
dual custody
n. 1. a function designed to require the presence of two persons with two different keys, combinations or codes to operate the same device. --adj. 2. pertaining to such a function.
dummy cylinder
n. a non-functional facsimile of a rim or mortise cylinder use for appearance only, usually to conceal a cylinder hole.
dummy trim
n. non-active trim applied for aesthetic purposes.
duplicate key
n. any key reproduced from a pattern key.
duress code
n. a special combination or operation sequence that conveys an alarm or other signal to a remote location while allowing access. Generally used when threatened to alert a central station.
dust box
n. an enclosure applied under a strike to enhance appearance and/or performance.
dust cover
n. a device designed to prevent foreign matter from entering a mechanism through the keyway.
edge-bore
n. a hole drilled into the edge of a door where a bored or interconnected lockset is to be installed.
educational occupancy
n. those buildings or areas that are designated as places for education purposes according to life safety or building codes.
effective throw
n. the distance a deadlatch remains projected when the guard bolt has been engaged and end pressure is applied to the latch.
egress
n. 1. A means of exit from a room, building or property. 2. A fire code that requires entry and exit specifications in bedrooms. 3. An exit.
egress control
n. This defines any electrical system that changes the normal means of egress for an exit door.
ejector pin
n. a tool used to drive all the elements of a pin chamber out of certain interchangeable cores.
electric strike
n. a strike that is operated electrically and allows access by a bypass button, keypad, card reader or other electrical input device. Generally used for access control. See also: keeper.
electrified lockset
n. a lock that is controlled electrically.
electromagnetic
adj. 1. Of or pertaining to electromagnetism or electromagnetic fields. 2. Of or exhibiting electromagnetism. 3. Pertaining to combined electric and magnetic fields associated with movements of electrons through conductors.
emergency key
n. the key that operates a privacy function lockset.
emergency master key
n. a special master key that usually operates all guestroom locks in a hotel master key system at all time, even in the shut out mode; key may also act as a shut out key.
end ward cut
n. any cut made into a key to bypass an end ward.
entry/exit delay
n. an alarm or access control feature that allows a specific time lapse between the activation of a switch and the activation of a secondary component.
escutcheon
n. a surface mounted trim that enhances the appearance and/or security of a lock installation.
exit delay timer
n. This is an electronic timer that delays a person from immediately exiting a building for a preprogrammed amount of time (normally 15 seconds) after an attempt to exit has been made. It is used primarily for loss prevention or wandering patient systems.
exit device
n. any device that is designed to allow anyone egress to the outside of a building without special knowledge, a key or other device. Most exit devices are installed on exterior doors of commercial buildings and are sometimes referred to as panic bars.
exit only
adj. 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.
extension link
n. a device that is used to extend the backset of a spring latch or dead latch.
extractor key
n. a tool that normally removes a portion of a two-piece key or blocking device from a keyway.
face
n. the finished component of a lock visible on the edge of a door.
faceplate
n. the finished, removeable plate that covers the front of some locks.
factory original key
n. the cut key furnished by the lock manufacturer for a lock or cylinder.
fail-safe
adj. 1. A feature of a security device designed to release or unlock, for safety purposes, during a power loss. 2. In the electric locking industry this defines any device that requires power (electrical energy) to remain locked. This can also be referred to as fail unlocked.
fail-secure
adj. 1. A feature of a security device designed to remain locked, for security purposes, during a power loss. 2. In the electric locking industry this defines any device that requires power (electrical energy) to be unlocked. This can also be referred to as fail locked.
fence
n. any locking element other than a sidebar or shackle designed to enter a tumbler's gate.
file cabinet lock
n. 1. any lock used on a file cabinet. 2. a plunger lock cylinder for a gang lock normally used in a file cabinet.
finish
n. a material, coloring and/or texturing specification.
fire alarm
n. a system designed to detect and report conditions, which may indicate presence of a fire.
fire door
n. a door constructed to provide a specific degree of fire protection.
fire door assembly
n. any combination of a fire door, frame, hardware and other accessories, that together provides a specific degree of fire protection to the opening.
fire exit hardware
n. exit devices that 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.
flat goods
n. ancillary architectural hardware such as push plates, mop plates, stretcher plates, kick plates, etc.
flat type key
n. a key that is completely flat on both sides, usually used for warded or lever tumbler locks.
foot
n. the cam portion of the trunnion assembly in some lever tumbler locks.
frangible shackle
n. a padlock shackle designed to be broken easily.
frangible shackle padlock
n. a padlock equipped with an easily broken shackle.
front
n. the portion of a lock that provides the means of mounting the locking device to the edge of the door.
full mortise
adj. 1. pertaining to a method of installing in that only the faceplate and trim are exposed, lock case is installed in a pocket in the door or drawer. --v. 2. to make a rectangular pocket in a door or drawer that is only open on the edge of the door or drawer.
fusible link arm
n. a door closer arm, that 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.
gang lock
n. a locking mechanism with multiple bolts that locks different openings simultaneously by a single action.
garage door lock
n. a rim lock mechanism designed for use on an overhead door, whose mechanism has a spring-loaded bolt that automatically locks the door's bolt mechanism.
glass relocker
n. a device employing a breakable plate intended to permanently incapacitate a security container’s normal opening mechanism if activated by physical attack on the container.
GMK section
abbr. grand master key section.
GMK’D
abbr. grand master keyed.
grand master key or GMK
n. the key that operates two or more separate groups of locks, that are each operated by a different master key.
grand master key system
n. a master key system that has exactly three levels of keying.
grand master keyed or GMK’D
adj. of or pertaining to a lock or cylinder that is or is to be keyed into a grand master key system.
graphite
n. a very common mineral, soft native carbon, occurring in black to dark-gray masses used for pencil leads, as a lubricant, and for making crucibles and electrodes. It is widely known that graphite is not a good lock lubricant.
graphite gun
n. a usually flexible container designed to dispense a powdered lubricant that is known as graphite.
great grand master key or GGMK
n. the key that operates two or more separate groups of locks that are each operated by a different grand master key (GMK).
great grand master key system
n. a master key system that has exactly four levels of keying.
great grand master keyed or GGMK’D
adj. of pertaining to a lock or cylinder that is or is to be keyed into a great grand master key system.
great great grand master key or GGGMK
n. the key that operates two or more separate groups of locks that are each operated by a different great grand master keys.
great great grand master key system
n. a master key system that has five or more levels of keying.
great great grand master keyed or GGGMK’D
adj. of or pertaining to a lock or cylinder that is or is to be keyed into a great great grand master key system.
grip
n. the knob, lever, thumb piece, push-pull operator, etc. of any working trim.
GSA
abbr. General Services Administration (US Government).
GSA container
n. any container approved by the General Services Administration for storage of classified material.
guard bolt
n. a spring loaded bolt which, when activated, will deadlock a latch bolt.
guard key
n. a key that must be used in conjunction with a renter’s key to unlock a safe deposit lock, usually the same for every lock within an installation.
guide
n. 1. that part of a key machine that follows the cuts of a pattern key or template during duplication. 2. that part of a flat-key lever lock that connects the nose to the foot and supports the key blade.
half-mortise hinge
n. a hinge that has one leaf mortised into the door and the second leaf applied to the surface of the frame.
half-surface hinge
n. a hinge that has one leaf mounted onto a face of the door and the second leaf mortised into the frame.
hand change
adj. pertaining to a combination lock in which the wheels must be removed in order to change the combination.
handed
adj. pertaining to hardware that is manufactured only for application on doors with a specific orientation. See also: "left hand"; "left hand reverse bevel"; "right hand"; & "right hand reverse bevel".
handicapped code
n. any building code designed to ease access for handicapped persons.
hard wire system
adj. one in that the components are directly connected to the central control unit.
hardware schedule
n. a listing of the door hardware used on a particular job; includes the type of hardware, manufacturers, locations, finishes, and sizes; should include a keying schedule specifying how each locking device is to be keyed.
hasp
n. a hinged metal strap designed to be passed over a staple and secured in place.
heel & toe locking
n. describes a padlock which has locking dogs at both the heel and toe of the shackle.
heel (of a padlock shackle)
n. the part of a padlock shackle that is retained in the case when in the unlocked position.
high security cylinder
n. a cylinder that offers a greater degree of resistance to any or all of the following: picking (‘def. 2’), impressioning, key duplication, drilling, or other forms of forcible entry.
high security key
n. a key for a high security cylinder.
hinge
n. 1. a jointed device or flexible piece on which a door, gate, shutter, lid or other attached part turns, swings, or moves. --v. 2. to furnish with or attach as if by a hinge.
hinge security stud
n. a protrusion on one leaf of a hinge that interlocks with the other when the door is closed.
hinge stile
n. the vertical edge of a door where hinges are installed.
hinged shackle
n. a shackle whose heel is permanently mounted to the padlock case in a manner that allows the shackle to pivot to open.
Hobbs shackle
n. a hinged shackle with a notch for the bolt in its movable end.
holding force
adj. In electric locks it’s the amount of foot-pounds required to be applied to the lock before it releases or fails to continue holding the door locked.
hold open arm
n. a door closer arm with the capability of maintaining the door in the open position.
hook bolt
n. a lock bolt shaped in the general outline of a hook, used on sliding doors or where spreading of the frame and door is a possible attack. See also: "claw bolt".
horizontal exit
n. an exit to the outside or an area of refuge on the same or nearly the same level.
horizontal linkage
n. a metal rod that is attached at one end to the lock mechanism, or a portion thereof, and the other end to the lock lever, or a portion thereof, on virtually every make and model of vehicle manufactured up to the year 2001. It is also used on the outside handle and/or keyed lock of most vehicle doors. When the lock lever is pushed down or pulled up, the lock mechanism is locked or unlocked via the linkage. See also: vertical linkage.
horizontal locking
n. the locking mechanism associated with vehicle doors that use horizontal linkages.
horn
n. in a non cylinder lock, the housing which surrounds the nose and extends through the door or drawer.
horn plate
n. the cover of a lever tumbler lock case to which the horn is attached.
hospital hinge
n. a hinge with a large chamfer at each end of the knuckle.
housing
n. that part of a locking device that is designed to hold a core.
hub
n. a lock component that redirects rotational motion from a spindle or shaft to linear movement of a latch or bolt.
hybrid locking system
n. 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.
IC
abbr. interchangeable core.
ICBO™
abbr. International Conference of Building Officials™.
ignition key release
n. a button or other actuator that must be pushed before a vehicle's ignition key may be turned to the withdrawal position.
ignition lock
n. the lock assembly associated with a vehicle's engine on off switch and starter.
index (of a combination lock dial)
n. the mark outside the dial ring of a combination lock used as a reference point. See also: opening index.
indicator
n. a device that provides visual evidence that a deadbolt is extended or that a lock is in the shut out mode.
inswing
adj. This defines a door that swings into the secure area when released.
interchangeable core
n. a key removable core that 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.
interconnected lockset
n. a lockset whose trim provides a means of simultaneous retraction of two or more latch bolts that may also be operated independently.
interlocking bolt
n. a bolt that interlocks with its strike when fully engaged.
intermittent duty
adj. of or pertaining to an electric strike of lock not designed to be energized for extended periods of time.
IR
abbr. Infrared.
jamb
n. the vertical components of a doorframe.
jimmy proof
adj. pertaining to a lock having a bolt that interlocks with its strike.
jumbo cylinder
n. a rim or mortise cylinder of 1-1/2" diameter.
KA1, KA2, etc.
abbr. a symbol that 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.
abbr. symbol used to indicate the quantity of locks or cylinders in keyed alike groups; groups are formed from a larger quantity; e.g. 30 cylinders KA/2.
keeper
n. the movable portion of an electric strike that captures the bolt. See also: "strike".
key
n. a properly combinated device that is, or most closely resembles, the device specifically intended by the lock manufacturer to operate the corresponding lock.
key blank
n. any material manufactured to the proper size and configuration that allows it’s entry into the keyway of a specific locking device; a key blank has not yet been combinated or cut.
key change
adj. referring to a lock in that the combination can be changed through the use of a special key or tool without disassembling the lock.
key coding machine
n. a key machine designed for the production of code keys; may or may not also serve as a duplicating machine.
key control
n. 1. any method or procedure that limits unauthorized 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 that remains after being cut and that aligns the tumbler(s). When identifying the cuts, they are usually read from the bow to the tip of the key.
key duplicating
v. 1. the act of copying a key. 2. to copy a key – as in using a key duplicating machine.
key duplicating machine
n. a key machine that is designed to make copies from a pattern key or template key.
key gauge
n. a usually flat device with a cutaway portion indexed with a given set of depth or spacing specifications, used to help determine the combination of a key.
key-in-knob cylinder
n. a cylinder used in a key-in-knob lockset.
key-in-knob lockset
n. any lockset with a key operated cylinder in one or more knobs.
key-in-lever lockset
n. any lockset with a key operated cylinder in one or more levers.
key machine
n. any machine designed to cut keys. See also: "key coding machine" and "key duplicating machine".
key milling
n. the grooves machined into the length of the key blade to allow its entry into the keyway.
key override
n. 1. a provision allowing interruption or circumvention of normal operation of a combination lock or electrical device. --adj. 2. 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 override function.
key pull(s)
n. a lock specification that indicates by quantity and orientation the position(s) in that a key may be withdrawn.
key pull position
n. any position, of the cylinder plug at that the key can be removed.
Key Records Department
n. the department that is responsible for generating and issuing all lock and key combinations and maintaining records of them.
key retaining
adj. 1. of or pertaining to a lock that must be locked before its key can be removed. 2. of or pertaining to a cylinder or lock that 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 switch
n. a switch operated by a keyed lock mechanism that may be an integral part of the switch assembly. Generally used for operating electrically-controlled gates, magnetic locks, electric strikes and the like.
key symbol
n. a designation used for a key combination in the standard key coding system, e.g., A, AA, AA1, etc. Generally used in a master key system.
keyed
adj. 1. Combinated. 2. having provision for operation by key.
keyed alike or KA
adj. of or pertaining to two or more locks or cylinders that have or are to have the same combination; may or may not be part of a keying system.
keyed different or KD
adj. of or pertaining to a group of locks or cylinders, each of that is or is to be combinated differently from the others; 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.
keyhole
n. the opening through which a non cylinder key must pass to enter a lock.
keyhole lock
n. a lock that blocks the keyhole of a bit key lock.
keyhole plate
n. an escutcheon for a keyhole.
keying
n. any specification for how a cylinder or group of cylinders are or are to be combinated in order to control access.
keying kit
n. a compartmented container that holds an assortment of tumblers, springs, and/or other parts used to combinate a key cylinder.
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.
keyway
n. 1. the opening in a lock or cylinder that is shaped to accept key bit or blade of a proper configuration. 2. the exact cross sectional configuration of a keyway as viewed from the front.
keyway post
n. 1. See "guide "definition 2". 2. the projecting pin of a lock or cylinder which enters the hollow end of a key.
keyway ward
n. a ward that prevents entry of an incorrect key into a cylinder or lock.
kick plate
n. a protective plate mounted on the bottom of a door to prevent damage to minimize damage to the door.
knob (of a door)
n. a projecting part, usually rounded, forming the handle of a door, drawer, or the like.
knock out tag
n. 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.
knuckle
n. a cylindrical part of a hinge, through which an axis or pin passes; the joint of a hinge.
KR
abbr. 1. keyed random. 2. key retaining.
L-handle
n. an L-shaped handle assembly that may be lockable.
L-handle lock
n. a cabinet lock with an L-shaped handle.
laminated padlock
n. a padlock whose case is constructed of separate metal plates usually riveted together.
latch
n. a mechanical device that automatically keeps a door closed until a deliberate action is used to retract it. See also: electric strike.
latch bolt
n. a spring actuated bolt, normally with one or more beveled surfaces, that, when aligned with the strike, engages it automatically.
latching speed (of a door closer)
n. the final speed of a door just prior to closing.
latchset
n. a non-locking device that contains only a latch bolt, a means of operating said latch and all required trim. Generally referring to a non-locking knob or lever, such as for a bedroom or closet.
lazy cam/tailpiece
n. a cam or tailpiece designed to remain stationary while the cylinder plug is partially rotated and/or vice-versa.
LED
abbr. 1. Light-Emmiting Diode. Used as a visual indication of lock status. 2. A light-emitting diode (LED) is a semiconductor device that emits incoherent narrow-spectrum light when electrically biased in the forward direction.
left-hand (LH)
adj. pertaining to door handing, when the hinges of a door are located on the left side of the door and the door opens into a building or room, or, when pushed, moves toward the inside of a building or room. Use when determining the handing of handed locksets. See also: handed.
left hand reverse bevel (LHR)
adj. pertaining to door handing, when the hinges of a door are located on the left side of the door and the door opens out of a building or room, or pulls toward the outside to open. Use when determining the handing of handed locksets. See also: handed.
lever
n. 1. a part of some locks that, when pushed or pulled in the downward direction, causes the lock mechanism to retract the latch. A lever is sometimes used instead of a knob. 2. any rigid bar, straight or bent, that oscillates about a pivot and acts with other parts in the manner of a lever.
lever pack
n. a set of lever tumblers.
lever tumbler
n. a flat, spring loaded tumbler that usually pivots on a post, contains a gate that must be aligned with a fence to allow movement of the bolt.
LH
abbr. left-hand.
LHR
abbr. left-hand reverse-bevel.
loading tool
n. a tool that aids installation of cylinder components into the cylinder shell.
LOBC
abbr. locked on by combination.
lock
n. any device that prevents access or use by requiring special knowledge or equipment.
lock service package
n. a kit offered by the manufacturer or distributor of a product that contains what they deem required to properly service the product.
lock stile
n. the vertical edge of a door designed for lock or latch installation.
locker lock
n. a cabinet lock designed specifically for use on lockers.
locking lug
n. a fixed component of a safe that locks the safe door in place in the locked position.
locking lug nut
n. a lug nut that requires the use of a key or special wrench.
lockset
n. a locking device, complete with trim, mounting hardware and strike.
locksmith
n. a person with the knowledge and ability to select, install, service, and bypass all the components of an electrical or mechanical lock.
magnetic contact
n. an electrical switch activated by magnetic attraction or repulsion.
magnetic lock
n. a lock specifically designed to hold a door, or other object, in the shut position until electricity is no longer allowed to pass through its coils, such as when a bypass button, card reader or other device is properly accessed.
man trap
n. a sally port designed for pedestrian traffic.
master key or MK
n. 1. a key that operates all the master keyed locks or cylinders in a group, each lock or cylinder usually operated by its own change key. --v. 2. 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 system
n. 1. any keying arrangement that has two or more levels of keying. 2. a keying arrangement that has exactly two levels of keying.
maser keyed or MK’D
adj. 1. of or pertaining to a cylinder or group of cylinders that are or are to be combinated so that all may be operated by their own change key(s) and by additional key(s) knows as master key(s). 2. a warded lock whose warding has been designed to allow different hierarchies of keys to operate.
master keyed only MK’D only
adj. of or pertaining to a lock or cylinder that is or is to combinated only to a master key.
master pin
n. 1. 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 wafer
n. a ward used in certain binary type disc tumbler key-in-knob locks. See also: "master pin" description 1.
matrix format master keying
n. a method of generating combinations and assigning key symbols in a master key system through the use of a matrix.
metal desk lock
n. a cabinet lock with a vertically sliding bolt located at the rear of the cylinder.
meter lock
n. 1. a padlock whose shackle consists of a single removable post, designed for locking utility meters or valves. 2. any of several small devices specifically designed to lock utility meters or valves and which require either a key or special wrench for removal.
mis-cut
adj. 1. of or pertaining to a key that has been cut incorrectly. --n. 2. a mis-cut key.
MK section
abbr. master key section.
mogul cylinder
n. a very large pin tumbler cylinder whose pins, springs, key, etc. are also proportionally increased in size; primarily used in prison locks.
momentary
adj. 1. In the electric locking industry this defines a switching device that is only active when mechanically actuated. As soon as the mechanical actuation is removed it returns to its rest or original state. 2. Lasting but a moment; very brief; fleeting.
mortise
v. 1. to prepare by removing stock material from the edge of a door, drawer, frame or opening to create a recess that allows the flush fit or insetting of relevant lock or locking related hardware. --n. 2. the cavity prepared by mortising. --adj. 3. of or pertaining to a locking device designed to fit in a mortise preparation.
mortise cylinder
n. a threaded cylinder typically used in mortise locks of American manufacture.
mortise exit device
n. an exit device designed for mortise installation.
mortise lockset
n. a lockset whose case is designed to fit in a mortise in the edge of a door or drawer.
MP
abbr. manipulation proof.
MR
abbr. manipulation resistant.
MS®
abbr. Maximum Security™. A trademark of the Adams Rite Manufacturing Co®.
mullion
n. a vertical center post in the frame of a pair of doors.
multi-section key blank
n. a key section that enters more than one, but not all keyways in a multiplex key system.
mushroom pin
n. a pin tumbler, usually a top pin, that resembles a mushroom, typically used to increase pick resistance.
neck (of a key)
n. 1. the portion of a bit key between the shoulder and the bit(s) 2. the portion of a cylinder key between the shoulder and the bow.
NFPA® 80
n. National Fire Protection Association® standards for doors and windows.
NFPA® 101
n. National Fire Protection Association® life safety code.
NFS
abbr. non-fail safe.
nightlatch
n. a rim mounted auxiliary latch bolt.
NLSA™
abbr. National Locksmith Suppliers Association™.
non-fail safe or NFS
adj. a feature of a security device designed to remain engaged or locked, for security purposes, during a power loss.
non-handed
adj. pertaining to hardware that is manufactured in a way that allows installation on doors of any orientation without requiring modification or adjustment to accommodate the door orientation. See also: handed.
non-key retaining or NKR
adj. of or pertaining to a lock whose key can be removed in both the locked and unlocked positions. See also: key retaining.
non-keyed
adj. having no provision for key operation. Note: this term also includes privacy function locksets operated by an emergency key.
non-removable key
adj. a key that has one or more cuts on it that traps the key in the lock upon insertion.
non-removable pin
n. pertaining to a hinge whose pin cannot be removed when the door is closed.
nose
n. the part of a non-cylinder lock that contains the keyway and rotates within a horn.
nose puller
n. a tool used to remove the nose of a lever tumbler lock and allow access to the tumblers.
NRK
abbr. non-removable key.
NRP
abbr. non-removable pin.
NUR
abbr. symbol for nurse's key.
nurse's key
n. a selective master key used in a hospital keying system.
occupancy type
adj. the use to which an area of a building is put with reference to the prevailing life safety or building code.
one bitted
adj. of or pertaining to a cylinder that is or is to be combinated to keys cut to the manufacturer’s reference number one bitting.
open gated
adj. pertaining to a lever tumbler whose gate is in the edge of the tumbler.
opening index
n. the index or mark to which a combination is dialed in order to effect an opening. See also: index.
operating shear line
n. any shear line that allows normal operation of a cylinder or lock.
original key blank
n. a key blank supplied by the lock manufacturer to fit that manufacturer’s specific product.
outswing
adj. This defines a door that swings out of the secure area when released.
Release hold timer: This is an electronic timer that extends the activation of a momentary switch for a preprogrammed amount of time.
overhead stop
n. a mechanical device normally installed at the top of the door face and doorframe header used to restrict the degree of the door swing.
pack
n. the set of tumblers in a lever tumbler or combination lock.
padlock
n. a detachable and portable lock with a shackle, which locks into its case.
panic button
n. any switching device in an alarm system designed to be activated by a person in a panic situation. It creates an immediate alarm condition.
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.
passage set
n. a non-locking latchset. See also: lock functions.
pattern key
n. a key that is cut, is or is to be used to operate a lock, and is used in conjunction with a key duplicating machine to duplicate the cuts on the given key. A key template.
pawl
n. the cam of certain automotive cylinders.
peanut cylinder
n. a mortise cylinder of 3/4" diameter.
peep hole
n. a small lens or opening that allows a limited view through a closed door.
personal identification number
n. a series of numbers and/or letters associated with a particular individual as a means of identification. See also: PIN.
pick
n. 1. 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. --v. 2. 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
abbr. personal identification number.
pin
v. 1. to install pin tumblers into a cylinder and/or cylinder plug. See also: "tumbler". --n. 2. a cylindrical shaped tumbler generally found in cylindrical locksets. See also: pin tumbler.
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. pinning kit; rekeying kit.
pin tumbler
n. a cylindrical shaped tumbler; three types are normally used: bottom pin, master pin and top pin.
pin tweezers
n. a tool used in handling tumblers and springs.
pinning block
n. a holding fixture that assists in the loading of tumblers into a cylinder or cylinder plug.
pinning chart
n. a numerical diagram that indicates the sizes and order or installation of the various pins into a cylinder; sizes are indicated by a manufacturer’s reference number that equals the quantity of increments a tumbler represents.
pippin file
n. a file with a cross section that resembles a pip or apple seed.
PIR
abbr. passive infrared.
plug
n. the part of a cylinder that 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 that assists in the loading of tumblers into a cylinder plug.
plug retainer
n. the cylinder component that secures the plug in the shell.
plug spinner
n. a tool that rotates a picked cylinder plug so quickly in the desired direction that it cannot lock during its rotation.
plunger lock
n. any of various spring loaded locks or cylinders that move in or out to accomplish a locking function. See also: file cabinet lock.
pop out lock
n. a plunger lock usually used on vending machines to prevent operation of a T-handle.
post (of a key)
n. the portion of a bit key between the tip and the shoulder, to that the bit(s) is(are) attached.
power locks
n. electrically or electro-pneumatically operated locks.
practical key changes
n. the total number of usable different combinations available for a specific cylinder or lock mechanism.
pre assembled lockset
n. 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.
prep
abbr. n. 1. the location and dimensions of the cut out(s) and reinforcing in a door or frame required to accept a piece of hardware. Preparation. --v. 2. to prepare a door or frame for installation of a lock or other hardware. Prepare.
primary key
n. a key, that operates the ignition lock on a vehicle; may or may not also operate some or all the other locks on the vehicle.
privacy key
n. a key that operates an SKD cylinder. See also: "emergency key".
profile cylinder
n. a cylinder with a uniform cross section, that slides into place and is held by a mounting screw, typically used in mortise locks of non-US. Manufacturers.
proprietary
adj. of or pertaining to a keyway and key section assigned exclusively to one end user by the lock manufacturer; may also be protected by patent law from duplication.
Pullman keeper
n. a type of keeper that is shaped to operate with the radiused contour of a Pullman latch.
Pullman latch
n. a type of latch that pivots like a hinge and whose locking side is radiused.
push button lock
n. a self-contained lock with controls that must be pressed in a specific pattern or sequence to open the lock. Usually mechanical in design.
push plate
n. typically a flat piece of metal that is installed on an area of a door that is normally pushed on by those using the door to enter or exit an area. Designed to take the abuse of wear and tear, instead of the door itself.
random master key
n. any undesirable process used to master key that uses unrelated keys to create a system.
ratchet lock
n. any lock which incorporates a ratchet device allowing locking in more than one position.
read
v. to decode a lock combination visually without disassembly of the lock or cylinder.
recombinate
v. to change the combination of a lock, cylinder or key.
rekey
v. to change the existing combination of a cylinder or lock.
remote release
n. a mechanism for permitting the unlocking of any lock device at a distance from the device.
removable core
n. a key removable core that can only be installed in one type of cylinder housing; e.g., rim cylinder, mortise cylinder or key-in-knob lock.
removable cylinder
n. a cylinder that can be removed from a locking device by a key and/or tool.
removable shackle
adj. referring to a type of padlock that is unlocked by removing the shackle from the case.
removal key
n. the part of a two-piece key that is used to remove its counterpart from a keyway. See also: "control key" definitions 1 and 3.
repin
v. to replace pin tumblers, with or without changing the existing combination. See also: rekey.
request to exit
v. 1. This defines the activity of having a remote device (such as a push button) tell the access control system to release the door so someone can exit. abbr. 2. REX
resistor pellet
n. the encapsulated resistor with exposed contacts installed in a key, such as that for VATS™.
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 duplication.
retainer
n. a component that is clipped, staked or driven in place to maintain the working relationship of other components.
retainer pin
n. 1. a component seated on a spring, in the end of a plug that interacts with a retainer cap to keep it in place. 2. any non-threaded rod that maintains the relationship of two or more different parts.
reversible
adj. pertaining to hardware that is manufactured in a way that allows field assembly or adjustment to accommodate installation on doors with different orientations. See also: handed.
reversible key
n. a symmetrical key that may be inserted either way up to operate the lock, such as in some automotive keys.
RF
abbr. Radio Frequency.
right-hand (RH)
adj. pertaining to door handing, when the hinges of a door are located on the right side of a door and the door opens into a building or room, or, when pushed, moves toward the inside of a building or room. Use when determining the handing of handed locksets. See also: handed.
right hand reverse bevel (RHR)
adj. pertaining to door handing, when the hinges of a door are located on the right side of a door and the door opens out of a building or room, or pulls toward the outside to open. Use when determining the handing of handed locksets. See also: handed
rim cylinder
n. a cylinder typically used with surface applied locks and attached with a back plate and machine screws; has a tailpiece to actuate the lock mechanism.
rim lock
n. a lock or latch typically mounted on the surface of a door or drawer.
ring key
n. a key attached to a ring to be worn on the finger.
RL
abbr. The title "Registered Locksmith" as awarded by ALOA®.
rose
n. a circular escutcheon.
round back
adj. pertaining to a rim cabinet lock whose mounting flanges and case form the general shape of a circle when viewed from the back.
S/A
abbr. sub-assembled.
safe
n. a secure box, esp. of iron or steel, for storing valuable articles.
sally port
n. an access control area with doors or gates secured by interlocks such that only one may be opened at a time. Generally used in banks. See also: man trap.
SBCCI™
abbr. Southern Building Code Congress International™.
scalp
n. a thin piece of metal that is usually crimped or spun onto the front of a cylinder; determines the cylinder’s finish and may also serve as the plug retainer.
Scandinavian padlock
n. a cast case padlock with an elliptical cross section. The locking mechanism is a set of rotating disc tumblers that engage notches in the cast shackle and may be rotated by the angled cuts cast on the key.
screen door lock
n. a lock designed for the thin stiles typically found on screen and storm doors.
screw less knob
n. a mortise lock knob assembly secured to the spindle without screws.
screw less rose
n. a mortise lock escutcheon rose installed without screws.
secondary key
n. a key that operates certain locks on a vehicle, but not the ignition lock.
secret gate latch
n. a small keyless rim latch, that when properly installed, is operated by pressing a concealed actuator.
security collar
n. a protective cylinder collar. See also: "cylinder guard".
SFIC®
abbr. Small Format Interchangeable Core®.
shackle
n. the part of a padlock, that passes through an opening in an object or fits around an object and it ultimately locked into the case.
shackle retaining pin
n. a pin that keeps an unlocked shackle heel in the case.
shackle spring
n. a spring that pushes the shackle into the open position when the padlock is unlocked.
shank
n. 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.
shear aligning maglock
n. A magnetic lock that is designed for use on sliding or swing-through doors. The magnetic force is applied along the horizontal axis of the strike instead of typical magnetic locks which force is applied directly to the flat surface of the strike.
shear line
n. 1. A location in a cylinder at that specific tumbler surfaces must be aligned, removing obstruction(s) that prevented the plug from moving. 2. A location on a door and frame where the door meets the frame when fully closed.
shell
n. the part of the cylinder that surrounds the plug and that usually contains tumbler chambers corresponding to those in the plug.
shim
n. 1. a thin piece of material used to unlock the cylinder plug from the shell by separating the pin tumbler at the shear line, one at a time. --v. 2. to unlock a cylinder plug from its shell by using a shim.
shoe
n. 1. a bracket that attaches to the arm of a door closer to the door or frame. 2. the surface mounted case and guide components of an exit device. 3. a mortise lock component that transfers pivoting motion of a thumb piece to linear movement of the latch.
shoulder
n. any key stop other than a tip stop. See also: "bow stop".
showcase lock
n. normally a ratchet lock or plunger lock used on bypassing doors.
shrouded shackle
n. a shackle that is protected from cutting or tampering by design or by the use of secondary shields.
shunt switch
n. a maintained contact switch, often key operated.
shutter
n. a spring-loaded device that covers a cylinder keyway when the key is not in it.
shutter spring
n. a spring that returns the shutter on a lock to the closed position.
sickle key
n. 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.
sidebar
n. a cylinder component that enters gate(s) in tumbler(s) to allow plug rotation.
sidebar lock
n. a lock mechanism that incorporates a sidebar.
side ward
n. a ward that prevents entry of an incorrect key into a non cylinder lock.
side ward cut
n. a cut made into a key to bypass a side ward.
simple latch
n. a non-deadlocking latch. See also: "deadlocking latch".
simultaneous retraction
n. a feature that allows retraction of both the deadbolt and latchbolt in the same operation. Typically found on mortise locksets that are installed on doors.
single acting lever tumbler
n. a lever tumbler that 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.
single cylinder
adj. pertaining to a lock with key operation from only one side. See also: "double cylinder".
single-D
adj. the shape of a cutout for a lock, circular except for the flat section on one side.
skeleton key
n. 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.
slider
n. a tumbler which is normally flat, has a gate and moves with a linear or lateral motion instead of pivoting like a lever tumbler.
slimjim
n. a narrow strip of spring steel used to bypass the cylinder and unlock vehicle doors.
Small Format Interchangeable Core®
n. an interchangeable core that replicates the functionality and design popularized by Best®. See also: A2, A3, and A4.
spacing
n. the dimensions from the stop to the center of the first cut and/or to the centers of successive cuts.
spare tire lock
n. a lock designed to prevent removal of a vehicle's spare tire.
spindle
n. a component that transfers rotary motion from outside a lock or latch case to an inner mechanism.
split finish
adj. of or pertaining to a lockset whose finish is different on each side of the door.
split spindle
n. a multi piece spindle that allows independent rotation of a knob or lever.
spool pin
n. usually a top pin that resembles a spool, typically used to increase pick resistance. See also: "mushroom pin".
spring cover
n. a device for sealing one or more pin chambers.
spring seat
n. the point at which a spring is anchored, located or attached and at which (from which) it exerts force.
square back
adj. pertaining to a rim cabinet lock whose mounting flanges and case form the general shape of a square.
stand alone
adj. In reference to locks, An access control system that makes its own access decisions without communicating with a central controller.
step pin
n. a spool or mushroom pin that has had a portion of its end machined to a smaller diameter than the opposite end, typically used as a top pin to improve pick resistance by some manufacturers of high security cylinders.
stop (of a door)
n. the projecting portion of a doorframe upon that the door rests when closed.
stop (of a key)
n. the part of a key from that all cuts are indexed and that determines how far the key enters the keyway.
stop works
n. a button or toggle mechanism that prevents operation of a knob, lever or thumbpiece in a non bored lock.
stop works button(s)
n. a one or two piece stop works activator.
store door function
n. a lockset function in that: a) a deadbolt is operated by key from either side and a latch is operated by working trim from either side; or b) a deadlocking latch can be withdrawn by working trim from either side except when both sides are locked by key from either side. See also: lock functions.
strike
n. 1. generally a flat piece of metal that is mortised into a door jamb that contains two small holes for mounting and one larger hole to accept a lockset latch. Can also be slightly curved, as in a spring latch strike. 2. a device that keeps or holds the latch. 3. an electric device that keeps or holds the latch of a lockset until the keeper is released allowing the latch to move freely. electric strike.
substitution code
n. a code whose individual characters are converted to individual key cuts or combination numbers by means of a reference table.
swing clear hinge
n. a hinge that allows the door to swing far enough away from the jamb to fully clear the opening at 90 degrees open.
switch lock
n. 1. a lock that incorporates an electrical switch as an integral part of its construction. 2. a large padlock designed for use on railroad switches.
swivel spindle
n. a two-piece spindle assembly whose two halves are designed to turn independently.
T-handle
n. a T-shaped handle assembly that may be lockable.
TMK
abbr. top master key.
tailpiece
n. an actuator attached to the rear of a cylinder, parallel to the plug, typically used on rim, key-in-knob, or special application cylinders.
telescoping column
n. a steering column adjustable for length.
template
n. a pattern used to mark cutout locations for hardware installation. See also: "boring jig".
template hinge
n. a hinge with dimensions, hole locations and tolerances that conform to ANSI® standard A156.7.
theoretical key changes
n. the total possible number of different combinations available for a specific cylinder or lock mechanism.
threaded rose
n. a rose with an internally threaded ferrule. See also: escutcheon.
three point latch
n. a self-latching device designed to latch a door at the top, bottom and edge.
throat cut
n. the cut made into a key to bypass a throat ward.
throat ward
n. an obstruction formed in a lock's case or horn at the point of key entry that prevents key rotation.
throw
n. the distance a bolt or latch projects from the faceplate or case of a lock in the extended position.
throw member
n. an intermediate actuator that engages the rear of the plug to transfer motion to a cam, tailpiece or other actuator.
thumbturn
n. a small, generally T-shaped handle that, when turned, locks, unlocks, extends or retracts a bolt, such as on a deadbolt lock.
thumb turn cylinder
n. a cylinder with a turn knob rather than a keyway and tumbler mechanism.
thumbpiece
n. a generally flat, projecting latch actuator found above a grip handle and depressed by the thumb.
tilt column
n. a steering column design which permits vertical adjustment of the steering wheel.
time delay
n. and adj. a feature that prevents operation until a set amount of time has elapsed, activation normally begins when access, egress or other unlocking is desired.
time lock
n. a secondary device that prevents movement of a bolt or boltworks until a set amount of time has elapsed, the device is normally set or activated at the time of locking.
time release
adj. This is an electronic timer that follows a preprogrammed course of events such as unlocking a door and shunting an alarm point and then relocking the door and enabling the alarm point at predetermined times of the day or night without supervision.
tip
n. the portion of the key that enters the keyway first.
toe (of a shackle)
n. that part of the shackle that may be removed from the padlock body.
toggle
n. a pivoting one piece stop works activator.
top jamb mount
n. surface application of a door closer body directly to the frame face header.
top of blade
n. the bitted edge of a single bitted key.
top pin
n. a cylindrical shaped tumbler, usually flat on both ends and installed directly under the spring in the pin stack.
touch bar
n. a type of exit device actuator with a paddle shape. 2. a remote door opener activator, typically electric or electronic, that facilitates handicap access. See also: exit device.
touch pad
n. 1. an exit device actuator with a paddle shape. 2. a remote door opener activator, typically electric or electronic, which facilitates handicap access.
trim
n. exposed components of a lockset or latchset that allow operation, enhance appearance or provide protection.
trim panel
n. the decorative and functional assembly which covers the inside surface of a vehicle door.
triplex spindle
n. a spindle with three wedge shaped bars that spread to grip the inside of the knob shank when the knob set screw is tightened.
try-out key
n. a manipulation key that 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; key cuts are made into the end of the blade, around its circumference.
tubular key cylinder
n. a cylinder whose tumblers are arranged in a circle that is operated by a tubular key.
tubular lockset
n. a bored lockset whose latch or bolt locking mechanism is contained in the compartment installed into the edge bore. See also: "cylindrical lockset".
tumbler
n. a movable obstruction of varying size and configuration in a lock or cylinder that makes direct contact with the key or another tumbler and prevents an incorrect key or torque device from activating the lock or other mechanism.
tumbler spring
n. any spring that acts directly on a tumbler.
turn disk
n. a disk shaped component with a cam actuated by a thumb turn, normally used in a mortise lock
UL®
abbr. Underwriters Laboratories®. An independent, not-for-profit organization which tests products in the interests of public safety.
UL Listed®
adj. listed in a directory as having passed specific Underwriters Laboratories® testing.
uncombinated
adj. 1. of or pertaining to a cylinder that is or is to be supplied without keys, tumblers and springs. 2. of or pertaining to a lock, cylinder or key in that the combination has not been set.
Vehicle Anti-Theft System (VATS™)
n. an electronic system in some General Motors (GM®) vehicles that uses a resistor pellet of varying value imbedded in a mechanical ignition key.
vertical down (VD)
adj. of or pertaining to a mounting orientation of a safe or vault lock such that the bolt projects downward.
vertical linkage
n. a metal rod that is attached at one end to the lock mechanism, or a portion thereof, and the other end to the lock lever, or a portion thereof, on virtually every make and model of vehicle manufactured up to the year 2001. It is also used on the outside handle and/or keyed lock of most vehicle doors. When the lock lever is pushed down or pulled up, the lock mechanism is locked or unlocked via the linkage. See also: "horizontal linkage".
vertical up (VU)
adj. of or pertaining to a mounting orientation of a safe or vault lock such that the bolt projects upward.
ward
n. a usually stationary obstruction in a lock or cylinder that prevents the entry and/or operation of an incorrect key.
ward cut
n. a modification of a key that allows it to bypass a ward.
warded
adj. having one or more wards.
Warnock Hersey
n. an independent testing laboratory.
wheel pack
n. an assembly of combination wheels; typically found in safes.
wheel puller
n. a tool used to remove the steering wheel from a column in a vehicle.
window bug
n. an alarm system component designed to detect breaking glass.
working trim
n. lock or exit device trim that activates a mechanism.
yoke
n. a component designed to secure cylinders or turn disks in both sides of a mortise lock by means of a single setscrew.
zero bitted
adj. of or pertaining to a cylinder that is or is to be combinated to keys cut to the manufacturer’s reference number "0" bitting.
Copyright 1999-2007 J&M Lock
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