(n.) A classification by Underwriters
Laboratories for doors with 1 1/2 hour
rated fire protection.
Source: Lock Industry Standards and Training
(LIST) Council
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.
Source: Lock Industry Standards and Training
(LIST) Council
Backcheck
(n.) The resistance provided by a door
closer as a door is opened.
Source: Lock Industry Standards and Training
(LIST) Council
Backset
(n.) The distance between the center
of a cross bore and the bolt edge of
a door or drawer.
Source: Lock Industry Standards and Training
(LIST) Council
Baffle
(n.) A device or devices designed to
deter the retrieval of items through
a depository opening.
Source: Lock Industry Standards and Training
(LIST) Council
Balance (A Combination)
(v.) To dial a combination 1 number high
and 1 number low to verify a correct
combination setting.
Source: Lock Industry Standards and Training
(LIST) Council
Balance Hole
(n.) The place in a combination wheel
where material has been eliminated to
provide an equal distribution of weight
over the entire wheel relative to the
axis.
Source: Lock Industry Standards and Training
(LIST) Council
Ball Bearing
(n.) 1. A metal ball used in the pin
stack to accomplish some types of hotel
or construction keying.
(n.) 2. A ball, usually made of steel,
used by some lock manufacturers as the
bottom element in the pin stack in one
or more pin chambers.
(n.) 3. Any metal ball used as a tumbler's
primary component.
(n.) 4. Used as a means of repairing
a drilled hole in a safe when welded
in place.
Source: Lock Industry Standards and Training
(LIST) Council
Ball Bearing Hardplate
(n.) A hardplate that contains metal
balls, typically two types, imbedded
in a honeycomb pattern, or free moving
within a hardplate envelope.
Source: Lock Industry Standards and Training
(LIST) Council
Ball Bearing Hinge
(n.) A hinge which uses ball bearings
between its knuckles to reduce friction.
Source: Lock Industry Standards and Training
(LIST) Council
Ball Catch
(n.) A latch which uses spring pressure
to force a ball bearing into a recess
in its strike.
Source: Lock Industry Standards and Training
(LIST) Council
Ball Locking
(adj.) A method of locking a padlock
shackle into its case using ball bearing(s)
as the bolt(s).
Source: Lock Industry Standards and Training
(LIST) Council
Barium Ferrite Card
(n.) An access control system credential
consisting of magnetized ferrite embedded
in a plastic card with polarity and location
being important features.
Source: Lock Industry Standards and Training
(LIST) Council
Barrel Bolt
(n.) A surface mounted slide bolt which
has a cylindrical shape.
Source: Lock Industry Standards and Training
(LIST) Council
Barrel Key
(n.) A type of bit key with a hole drilled
into the shank from the tip.
Source: Lock Industry Standards and Training
(LIST) Council
Barrier Free
(n.) Having to do with the absence of
restrictions to access by the handicapped.
Source: Lock Industry Standards and Training
(LIST) Council
Barron, Robert
The Englishman credited with the invention
of the double acting lever tumbler in
1778.
Source: Lock Industry Standards and Training
(LIST) Council
Source: Lock Industry Standards and Training
(LIST) Council
Battery Eliminator
(n.) An electric device designed to provide
energy to equipment normally requiring
batteries for operation.
Source: Lock Industry Standards and Training
(LIST) Council
BBC
(abb.) Basic Building Code
Source: Lock Industry Standards and Training
(LIST) Council
Bell Box
(n.) The protective enclosure for a bell
or other alarm sounding device.
Source: Lock Industry Standards and Training
(LIST) Council
Bell Type Key
(n.) A key whose cuts are in the form
of wavy grooves milled into the flat
sides of the key blade. The grooves usually
run the entire length of the blade.
Source: Lock Industry Standards and Training
(LIST) Council
Bevel (Of A Door)
(n.) The pitch on the leading edge of
a door which allows clearance for closing.
Source: Lock Industry Standards and Training
(LIST) Council
Bevel (Of A Lock)
(n.) The pitch of the face designed to
match the bevel of a door. Some locks
have an adjustable bevel.
Source: Lock Industry Standards and Training
(LIST) Council
Bezel
(n.) A threaded collar commonly used
to secure certain cylinder or lock assemblies.
Source: Lock Industry Standards and Training
(LIST) Council
BHMA
(abb.) Builders Hardware Manufacturers
Association
Source: Lock Industry Standards and Training
(LIST) Council
Bi-Directional Cylinder
(n.) A cylinder which may be operated
in a clockwise and counterclockwise direction
by a single key.
Source: Lock Industry Standards and Training
(LIST) Council
Bi-Fold Door
(n.) A door with two or more sets of
hinges, the additional set(s) allows
the door to have an accordion action
when opened.
Source: Lock Industry Standards and Training
(LIST) Council
Bible
(n.) That portion of the cylinder shell
which normally houses the pin chambers,
especially those of a key-in-knob cylinder
or certain rim cylinders.
Source: Lock Industry Standards and Training
(LIST) Council
Bicentric Cylinder
(n.) A cylinder which has two independent
plugs, usually with different keyways.
Both plugs are operable from the same
face of the cylinder. It is designed
for use in extensive master key systems.
Source: Lock Industry Standards and Training
(LIST) Council
Bicycle Padlock
(n.) A padlock with sufficient shackle
clearance to secure a bicycle.
Source: Lock Industry Standards and Training
(LIST) Council
Bilevel Capable
(n.) Typically a key that can operate
two compatible mechanisms which have
different security features.
Source: Lock Industry Standards and Training
(LIST) Council
Binary Cut Key
(n.) A key whose combination only allows
for two possibilities in each bitting
position: cut/no cut.
Source: Lock Industry Standards and Training
(LIST) Council
Binary Type Cylinder Or Lock
(n.) A cylinder or lock whose combination
only allows for two bitting possibilities
in each bitting position.
Source: Lock Industry Standards and Training
(LIST) Council
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.
Source: Lock Industry Standards and Training
(LIST) Council
Bit
(n.) 1. The part of the key which serves
as the blade, usually for use in a warded
or lever tumbler lock.
(v.) 2. To cut a key.
Source: Lock Industry Standards and Training
(LIST) Council
(n.) The part of a key that enters the
lock and engages the bolt and tumblers.
Source: Dictionary.com
Bit Height
(n.) A measurement from the post of a
bit key outward to the end of the bit.
Source: Lock Industry Standards and Training
(LIST) Council
Bit Key
(n.) A key with one or more projecting
bits.
Source: Lock Industry Standards and Training
(LIST) Council
Bit Thickness
(n.) A measurement of the bit from one
side to the other side.
Source: Lock Industry Standards and Training
(LIST) Council
Bit Width
(n.) As inserted into a lock, a measurement
from the leading edge to the trailing
edge of a bit.
Source: Lock Industry Standards and Training
(LIST) Council
Bitting
(n.) 1. The number(s) which represent(s)
the dimensions of the key.
(n.) 2. The actual cut(s) or combination
of a key.
Source: Lock Industry Standards and Training
(LIST) Council
Bitting Depth
(n.) The depth of a cut which is made
into the blade of a key.
Source: Lock Industry Standards and Training
(LIST) Council
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.
Source: Lock Industry Standards and Training
(LIST) Council
Bitting Position
(n.) The location of a key cut.
Source: Lock Industry Standards and Training
(LIST) Council
Blade
(n.) The portion of a key which may contain
the cuts and/or millings.
Source: Lock Industry Standards and Training
(LIST) Council
Blank
(adj.) Not having received final processing;
unfinished: a blank key.
Source: Dictionary.com
(adj.) Uncut.
Source: Lock Industry Standards and Training
(LIST) Council
(n.) A designation, unrelated to the
bitting, assigned to a particular key
combination for future reference when
additional keys or cylinders may be needed.
Source: Lock Industry Standards and Training
(LIST) Council
Block Master Key
(n.) The one pin master key for all combinations
listed as a block in the standard progression
format.
Source: Lock Industry Standards and Training
(LIST) Council
Blocking Lever
(n.) A lever in a safe deposit lock which
blocks the renters key from completely
entering the lock until the guard key
has been inserted and turned.
Source: Lock Industry Standards and Training
(LIST) Council
BMK
(abb.) Block Master Key
Source: Lock Industry Standards and Training
(LIST) Council
BOCA
(abb.) Building Officials and Code Administration
International
Source: Lock Industry Standards and Training
(LIST) Council
BOCA National Building Code
(abb.) Building Officials and Code Administration
International (formerly Basic Building
Code)
Source: Lock Industry Standards and Training
(LIST) Council
Bolt
(n.) 1. A bar made of wood or metal that
slides into a socket and is used to fasten
doors and gates.
(n.) 2. A metal bar or rod in the mechanism
of a lock that is thrown or withdrawn
by turning the key.
Source: Dictionary.com
(n.) Any movable projection which blocks
the movement of one object relative to
another.
Source: Lock Industry Standards and Training
(LIST) Council
Bolt Cup
(n.) A thimble shaped device in a safe
door frame that a locking bolt extends
into when the door is closed and the
bolt(s) are extended.
Source: Lock Industry Standards and Training
(LIST) Council
Bolt Head
(n.) The part of a bolt that enters a
strike.
Source: Lock Industry Standards and Training
(LIST) Council
Bolt Motor
(n.) 1. A mechanical device that extends
and retracts the door bolt(s)of a safe,
normally engaged by closing the door
and disengaged by a time lock.
(n.) 2. A mechanical device (usually
electrically powered) that extends and
retracts the bolt of a safe lock. It
is commonly disengaged by an electronic
input such as that from a keypad.
Source: Lock Industry Standards and Training
(LIST) Council
Bolt Sensor Switch
(n.) A switch installed to detect when
a lock bolt is extended or retracted.
Source: Lock Industry Standards and Training
(LIST) Council
Bolt Shim
(n.) A plate or plates mounted to the
frame of a vault to provide equal gapping
for each locking bolt.
Source: Lock Industry Standards and Training
(LIST) Council
Bolt Tail
(n.) The part of a bolt retained in the
lock case that contains the bolt slot
and maintains bolt alignment.
Source: Lock Industry Standards and Training
(LIST) Council
Bolted, Bolting, Bolts
(v. tr.) To secure or lock with or as
if with a bolt.
Source: Dictionary.com
Boltwork Button
(n.) The component which automatically
triggers extension of the locking bolt(s)
when the door is in the closed position.
Source: Lock Industry Standards and Training
(LIST) Council
Boltworks
(n.) 1. The combination of bars, rods,
plates and linkages in a safe door designed
to hold the door in the locked or unlocked
position depending on the status of the
lock itself.
(n.) 2. Any part of a lock other than
a cylinder, turnpiece, or operating handle
that affects movement of, or the ability
to move, the bolt.
Source: Lock Industry Standards and Training
(LIST) Council
Bond Box
(n.) The removable container within a
safe deposit box compartment.
Source: Lock Industry Standards and Training
(LIST) Council
Bored, Bored-in Lock
A lock installed by cross-boring two
holes – one for cylinder and
one for the bolt mechanism.
Source: Dictionary.com
(n.) A lock for a door prepared with
one or more cross bores and one or more
edge bores.
Source: Lock Industry Standards and Training
(LIST) Council
(n.) An internally lighted optical instrument
for viewing normally concealed or inaccessible
components.
Source: Lock Industry Standards and Training
(LIST) Council
Boring Jig
(n.) A tool, temporarily affixed to a
door, which provides a template structure
to guide drill bits properly when preparing
for the installation of specific hardware.
Source: Lock Industry Standards and Training
(LIST) Council
Bottom Of Blade
(n.) The portion of the blade opposite
the cut edge of a single bitted key.
Source: Lock Industry Standards and Training
(LIST) Council
Bottom Pin
(n.) Usually a cylindrical shaped tumbler
which may be conical, ball shaped or
chisel pointed on the end which makes
contact with the key.
Source: Lock Industry Standards and Training
(LIST) Council
Bow
(n.) The portion of the key which serves
as a grip or handle.
Source: Lock Industry Standards and Training
(LIST) Council
Bow Stop
(n.) A type of stop located near the
key bow.
Source: Lock Industry Standards and Training
(LIST) Council
Box Of Wards
(n.) A complete unit of intricate wards
installed in or on a lock case.
Source: Lock Industry Standards and Training
(LIST) Council
Box Strike
(n.) A strike equipped to line the bolt
cavity for both aesthetic and protective
purposes.
Source: Lock Industry Standards and Training
(LIST) Council
Brace Lock
(n.) A deadbolt lock that engages an
independent bolt, one end of which is
mounted in the floor away from the door.
Source: Lock Industry Standards and Training
(LIST) Council
Bramah Type Lock
(n.) A lock or cylinder using a mechanism
with sliders, normally arranged in a
circle.
Source: Lock Industry Standards and Training
(LIST) Council
Bramah, Joseph
The Englishman who had the world's first
patent of a locking mechanism in 1784.
It was the first lock incorporating a
cylinder whose key did not contact the
lock bolt directly.
Source: Lock Industry Standards and Training
(LIST) Council
(n.) A removable frame that contains
the wheel pack and wheel post that is
often found in mechanical vault locks.
Source: Lock Industry Standards and Training
(LIST) Council
Bridge Ward
(n.) A center ward attached to the interior
of a lock by means of a bracket.
Source: Lock Industry Standards and Training
(LIST) Council
Broach
(n.) 1. A tool used to cut the keyway
into the cylinder plug.
(v.) 2. To cut the keyway into a cylinder
plug with a broach.
Source: Lock Industry Standards and Training
(LIST) Council
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.
(n.) 2. The dimension of the buildup
pin required in a particular chamber,
which will allow one key to operate at
the plug shear line and a different key
to operate at a different shear line.
Source: Lock Industry Standards and Training
(LIST) Council
Build Up Pin
(n.) The additional element of a pin
stack required to allow operation at
different shear lines in a cylinder.
Source: Lock Industry Standards and Training
(LIST) Council
Building Master Key
(n.) A master key which operates all
or most master keyed looks in a given
building.
Source: Lock Industry Standards and Training
(LIST) Council
Bullet Catch
(n.) A friction catch with a projecting
latch which is spherical or dome shaped.
Source: Lock Industry Standards and Training
(LIST) Council
Bump Key
(n.) A cut key, cut to allow the user
to replicate the action of a pick gun.
Source: Lock Industry Standards and Training
(LIST) Council
Burglar Alarm
(n.) A system designed to detect and
report conditions which may indicate
intrusion or attempted intrusion.
Source: Lock Industry Standards and Training
(LIST) Council
Burglar Resistant
(adj.) Of or pertaining to a security
container designed to resist forcible
entry for a specified period of time
determined by the rating of the container.
Source: Lock Industry Standards and Training
(LIST) Council
Button Knob
(n.) The knob in a key-in-knob lock that
includes a push or turn button.
Source: Lock Industry Standards and Training
(LIST) Council
By Pass Tool
(n.) A device that neutralizes the security
of a locking device, or its application
hardware, often taking advantage of a
design weakness.
Source: Lock Industry Standards and Training
(LIST) Council
By-Passing Door Lock
(n.) A lock with a bolt that extends
to block parallel movement of another
door.
Source: Lock Industry Standards and Training
(LIST) Council
By-Passing Sliding Door
(n.) Two doors mounted on tracks parallel
to each other that when one or both are
slid to opposite extremes block the opening.
Typically, one may be moved behind the
other to allow access.
Source: Lock Industry Standards and Training
(LIST) Council
Bypass Key
(n.) The key which operates a key override
cylinder.
Source: Lock Industry Standards and Training
(LIST) Council
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