A deadbolt lock is a type of lock that is typically used on the exterior doors of a home or business. It is called a “deadbolt” because the bolt (the metal part that extends from the lock into the door frame) does not have a spring mechanism, which means that it does not move unless the lock is deliberately operated.
A deadbolt lock typically has two main parts: the lock body, which is mounted on the door, and the strike plate, which is mounted on the door frame. The lock body contains the mechanism that operates the bolt, and the strike plate is the part that the bolt extends into.
There are two main types of deadbolts: single-cylinder and double-cylinder. A single-cylinder deadbolt has a keyed cylinder on one side and a thumb turn on the other, while a double-cylinder deadbolt has a keyed cylinder on both sides.
If you are considering adding or replacing a deadbolt on one of your doors, check out this article by Bob Villa before you begin.