A dead bolt or dead lock (also deadbolt), 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.
Read more about Dead Bolt: Common Types, Safety
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