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Weinstein & Holtzman School

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Back Check

Optional feature in hydraulic door closers slowing the opening swing of door somewhere between 600 and 850 of opening. Designed to protect an object behind the door. Not intended to act as an overhead stop.

Backset (of a lock)

The horizontal distance from the face of the lock to the center line of knob hub keyhole or cylinder. (Measured from the high side of a beveled door.)

Backset (of a hinge)

The distance from the edge of the door to the hinge.

Ball-Bearing Hinge

A hinge equipped with ball bearings between the hinge knuckles to reduce friction. (See Anti Friction Bearing.)

Bevel (of a door)

The angle of the lock edge in relation to the face of the lock stile.
Standard bevel is 1/8" in 2" (3.2mm in 50.8mm) It otherwise detailed it must be so noted in ordering locks.

Bevel (of a lock)

A term used to indicate the direction in which the latch bolt is inclined: regular bevel for doors opening in, reverse bevel for doors opening out.

Bevel (of a lock front)

The angle of a lock front when not at right angle to the lock case, allowing the front to be applied flush with the edge of a beveled door.

Bit (of a key)

The projecting blade, cut in a manner that actuates the tumblers and permits the lock bolts to be operated.

Bored Lock (or Latch)

Lock or latch whose parts are intended for installation in holes bored in a door

Box Strike

A strike that also provides a complete housing to protect the bolt openings.

Builders' Hardware

See Architectural Hardware.

Butt (Hinge)

A type of hinge designed for mortising into the edge of the door and into the rabbet of a door frame.