2-1/8” Bore
The current standard installation prep - a 2-1/8” hole drilled through face of door to receive a modern-style “cylinder latch” mechanism.

Backset
Measurement from edge of door to center of doorknob (and spindle hub where spindle passes through latch).

Bolt
A mechanism that locks a door shut only.

Bore
The diameter of the hole drilled in a door for an entry set knob, lever or deadbolt.

Cam
A rotating piece attached to the end of the cylinder plug to engage the locking mechanism.

Case
The box containing the lock mechanism.

Cylinder Bore
Refers to a machining procedure that requires a round hole to accommodate a standard entry set.

Cylinder Lock
A lock in which the locking mechanism is controlled by a cylinder.

Deadbolt
Locking mechanism for an entrance door or other door. Deadbolts can be a single cylinder or double cylinder. With a single cylinder deadbolt, a key is used on the outside and is turned by hand on the inside. With a double cylinder deadbolt, a key is used on both sides.

Door Set
A set of two knobs (w/spindle) and two escutcheons for decorative door trim. Latch purchased separately.

Edge Plate
An angle or channel-shaped guard used to protect the edge of a door.

Escutcheon
A plate long enough to span a lock case and having holes for knob bushing, bit key, cylinder, turn knob and similar operating members as required.

Finish Builders’ Hardware
Hardware that has a finished appearance as well as a functional purpose. Also termed Architectural Hardware, Finish Hardware and Builders’ Hardware.

Hinge Stile
The stile to which the hinges are applied as distinguished from the lock stile.

Key Plate
A small plate or escutcheon having only a keyhole.

Knob Shank
The projecting stem of a knob into which the spindle is fastened.

Lock Set
A lock, complete with trim, such as knobs, escutcheons or handles.

Lock
A mechanism that holds a door shut and offers a locking option.

Mortise Lock
A lock designed to be installed in a mortise rather than applied to the door’s surface.

Preassembled Lock
A lock that has all the parts assembled as a unit at the factory, and when installed in a rectangular notch cut into the door edge, requires little or no disassembly.

Rosette
A circular escutcheon behind a knob.

Set Screw
A small screw in the shank of a knob that is tightened to fix the knob on the spindle.

Shank
The projecting stem of a knob into which the spindle is fastened.

Spindle
A square steel rod connecting two doorknobs through the latch. The spindle can be threaded or have holes in its side, depending on what type of knob it’s used with.

Strike
A metal plate or box that is pierced or recessed to receive the bolt or latch when projected. Sometimes called Keeper.

Throw (of a deadbolt or latch bolt)
Measurement of the maximum projection when bolt is fully extended.

Tumbler
A guard or obstruction that prevents operation of a bolt except by insertion of the proper key

Universal
A term used to describe a lock, a door closer or other device that can be used on doors of any hand without change.