deadbolt
A lock bolt, usually rectangular, that has no spring action, and that becomes locked against end pressure when fully projected.
deadlatch
A lock with a beveled latch bolt that can be automatically or manually locked against end pressure when projected.
deadlock
A lock that projects a deadbolt.
depth
The depth of a cut is measured from the bottom of the blade up to the bottom of a cut. Depths are numbered starting with #0 (or sometimes #1) as the highest depth.
depth key
A special key that enables a locksmith to cut blanks made from a particular lock according to a key code.
display key
A special change key in a hotel master key system which will allow access to one designated guest room, even if the lock is in the shut out mode. It may also act as a shut out key for that room.
drivers
The pins in a lock that sit on top of the lower pins.
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