bolt which is not actuated by a spring. When locked the bolt cannot be returned by end pressure.
An auxiliary lock operated independently of the ordinary spring mortise lock, the bolt of which cannot be moved except by the use of a key or an inside knob. A double cylinder dead bolt is one that can be operated only by a key on either side of the door.
A locking device that can be activated only with a key or thumb turn. Unlike a latch which has a beveled tongue, dead bolts have square ends.
A lock bolt that does not have an automatic spring action and a beveled end as opposed to a latch bolt, which does.
A lock that requires a key to open from the outside and a turn bolt from the inside, which slides into a receptacle in the doorjamb. It is also called a deadbolt lock or a dead lock.
An exterior security lock installed on exterior entry doors that can be activated only with a key or thumb-turn; unlike a latch, which has a beveled tongue, dead bolts have square ends
A locking mechanism that is separate from the latching mechanism in a door set. A dead bolt can be locked by a key or a turn piece. [Category: Lock Mechanisms Terminology