Deadbolt Lock

A Deadbolt or deadlock, 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.