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Locking mechanism
For other uses, see Deadbolt (disambiguation).
"Dead lock" redirects here. For other uses, see Deadlock (disambiguation).
Door with two locks, one in the doorknob and a separate deadbolt
A deadbolt or deadlock is a type of lock morticed into a wooden door. Then, using a key from either side of the door, a bolt is thrown into the door frame, thus securing the door. [1] It is distinct from a spring bolt lock because a deadbolt can only be opened by a key or handle. The more common spring bolt lock uses a spring to hold the bolt in place, allowing retraction by applying force to the bolt itself.[2] A deadbolt can therefore make a door more resistant to entry without the correct key, as well as make the door more resistant to forced entry.[citation needed] A deadbolt is often used to complement a spring-bolt lock on an entry door to a building.
^"What is a Deadlock? Everything you need to know | Locksmith Direct". www.locksmith.direct. Retrieved 2023-04-20.
^"How to Repair a Doorknob - Old House Journal Magazine". 24 October 2012.
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