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A deadbolt or deadlock, is a locking mechanism distinct from a spring-bolt lock because a deadbolt cannot be moved to the open position except by rotating the lock cylinder. The more common spring-bolt lock uses a spring to hold the bolt in place, allowing retraction by applying force to the bolt itself. A deadbolt can therefore make a door more resistant to entry without the correct key.
A deadbolt is often used to complement a spring-bolt lock on an entry door to a building.
A deadlock may be either single cylinder or double cylinder. A single cylinder deadlock will accept a key on one side of the lock, but be operated by a twist knob on the other side. Double cylinder locks will accept a key on both sides and can therefore do away with the twist knob. This prevents unwanted unlocking of the door by forced access to the twist knob, via a nearby window for example.
A variant of the standard deadbolt is the vertical deadbolt, which generally rests on top of a door. Vertical deadbolts resist jimmying, in which an intruder inserts a pry bar between the door and the frame and attempts to pry the bolt out of the jamb.
Other types of deadbolts include:
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