Busse's Lock Service, LLC: 
                        2003 Wake Forest Rd, Raleigh, NC 27608

Glossary

Backset

This refers to the measurement from the edge of the door to the center of the main bore of an installed lock. To obtain this measurement, hook a measuring tape on the edge of the door and measure right to center of the keyhole. The most common backset for modern residential-grade locks is 2-3/8". The standard backset for commercial-grade locksets is 2-3/4." If you are buying a replacement lock, this is the most important dimension to match.

Barrel key

This is the typical type of key used on antique and antique-style furniture. The reason it is called a barrel key is because of the post-hole drilled into the bottom of the key. It is distinguished from a bit key, which is more commonly used on antique or antique-style door locks. Together, bit and barrel keys are sometimes called “skeleton keys.” It is not true that all such keys are interchangeable. Some locks that use barrel keys are quite complex; the key must be cut precisely in order to operate it.

Bit key

This is the typical type of key used on antique or antique-style door locks, especially interior doors on older homes. It is distinguished from barrel key by the protruding post on the end of the key. Together, bit and barrel keys are sometimes called “skeleton keys.” It is not true that all such keys are interchangeable. Some locks that use bit keys are quite complex; the key must be cut precisely in order to operate it.

Bored Lock

see Cylindrical Lock, below

Bow

(with a long O sound) This is the technical term for the handle part of all keys.