Locksmith Glossary - B


Source: Lock Industry Standards and Training (LIST) Council

B Label
(n.) A classification by Underwriters Laboratories for doors with 1 1/2 hour rated fire protection.

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.

Baffle
(n.) A device or devices designed to deter the retrieval of items through a depository opening.

Balance (A Combination)
(v.) To dial a combination 1 number high and 1 number low to verify a correct combination setting.

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.

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.

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.

Ball Bearing Hinge
(n.) A hinge which uses ball bearings between its knuckles to reduce friction.

Ball Catch
(n.) A latch which uses spring pressure to force a ball bearing into a recess in its strike.

Ball Locking
(adj.) A method of locking a padlock shackle into its case using ball bearing(s) as the bolt(s).

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.

Barrel Bolt
(n.) A surface mounted slide bolt which has a cylindrical shape.

Barrel Key
(n.) A type of bit key with a hole drilled into the shank from the tip.

Barrier Free
(n.) Having to do with the absence of restrictions to access by the handicapped.

Barron, Robert
The Englishman credited with the invention of the double acting lever tumbler in 1778.

Source: Lock Industry Standards and Training (LIST) Council

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.

BBC
(abb.) Basic Building Code

Bell Box
(n.) The protective enclosure for a bell or other alarm sounding device.

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.

Bevel (Of A Door)
(n.) The pitch on the leading edge of a door which 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 or lock assemblies.

BHMA
(abb.) Builders Hardware Manufacturers Association

Bi-Directional Cylinder
(n.) A cylinder which may be operated in a clockwise and counterclockwise direction by a single key.

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.

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.

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.

Bicycle Padlock
(n.) A padlock with sufficient shackle clearance to secure a bicycle.

Bilevel Capable
(n.) Typically a key that can operate two compatible mechanisms which have different security features.

Binary Cut Key
(n.) A key whose combination only allows for two possibilities in each bitting position: cut/no cut.

Binary Type Cylinder Or Lock
(n.) A cylinder or lock whose combination only allows for two bitting possibilities in each bitting position.

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 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.

Bit Key
(n.) A key with one or more projecting bits.

Bit Thickness
(n.) A measurement of the bit from one side to the other side.

Bit Width
(n.) As inserted into a lock, a measurement from the leading edge to the trailing edge of a bit.

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.

Bitting Depth
(n.) The depth of a cut which is made into the blade of a key.

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

Bitting Position
(n.) The location of a key cut.

Blade
(n.) The portion of a key which may contain the cuts and/or millings.

Blank
(adj.) Not having received final processing; unfinished: a blank key.

Source: Dictionary.com

(adj.) Uncut.

Source: Lock Industry Standards and Training (LIST) Council

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

Block Master Key
(n.) The one pin master key for all combinations listed as a block in the standard progression format.

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.

BMK
(abb.) Block Master Key

BOCA
(abb.) Building Officials and Code Administration International

BOCA National Building Code
(abb.) Building Officials and Code Administration International (formerly Basic Building Code)

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.

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.

Bolt Head
(n.) The part of a bolt that enters a strike.

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.

Bolt Sensor Switch
(n.) A switch installed to detect when a lock bolt is extended or retracted.

Bolt Shim
(n.) A plate or plates mounted to the frame of a vault to provide equal gapping for each locking bolt.

Bolt Tail
(n.) The part of a bolt retained in the lock case that contains the bolt slot and maintains bolt alignment.

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.

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.

Bond Box
(n.) The removable container within a safe deposit box compartment.

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

Borescope
(n.) An internally lighted optical instrument for viewing normally concealed or inaccessible components.

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.

Bottom Of Blade
(n.) The portion of the blade opposite the cut edge of a single bitted key.

Bottom Pin
(n.) Usually a cylindrical shaped tumbler which may be conical, ball shaped or chisel pointed on the end which makes contact with the key.

Bow
(n.) The portion of the key which serves as a grip or handle.

Bow Stop
(n.) A type of stop located near the key bow.

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.

Brace Lock
(n.) A deadbolt lock that engages an independent bolt, one end of which is mounted in the floor away from the door.

Bramah Type Lock
(n.) A lock or cylinder using a mechanism with sliders, normally arranged in a circle.

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

Bridge Assembly
(n.) A removable frame that contains the wheel pack and wheel post that is often found in mechanical vault locks.

Bridge Ward
(n.) A center ward attached to the interior of a lock by means of a bracket.

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.

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.

Build Up Pin
(n.) The additional element of a pin stack required to allow operation at different shear lines in a cylinder.

Building Master Key
(n.) A master key which operates all or most master keyed looks in a given building.

Bullet Catch
(n.) A friction catch with a projecting latch which is spherical or dome shaped.

Bump Key
(n.) A cut key, cut to allow the user to replicate the action of a pick gun.

Burglar Alarm
(n.) A system designed to detect and report conditions which may indicate intrusion or attempted intrusion.

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.

Button Knob
(n.) The knob in a key-in-knob lock that includes a push or turn button.

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.

By-Passing Door Lock
(n.) A lock with a bolt that extends to block parallel movement of another door.

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.

Bypass Key
(n.) The key which operates a key override cylinder.

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