Deadbolt – Deadbolts usually extend deeper into the frame and are not automatically retractable the way latch bolts are.By the use of a latch bolt, a door can be closed without having to operate the handle. Latch bolt – A bolt that has an angled surface which acts as a ramp to push the bolt in while the door is being closed.Bolt – A (nearly always) metal shaft usually internal to the door, attached by cleats or a specific form of bracket, that slides into the jamb to fasten a door.Latch – A device that allows one to fasten a door, but doesn't necessarily require an external handle.Most doors make use of one or more fasteners to hold the door closed. Some doors, particularly older ones, will have a keyhole accompanying the lock. A lock is a device that prevents access by those without a key or combination, generally by preventing one or more latches from being operated.
