Dead Latch Lock

Description:
A dead latch lock is a security locking mechanism commonly used on residential, commercial, and storefront doors. It features a spring-loaded latch bolt with an additional deadlocking plunger that prevents the latch from being forced back using tools such as cards or shims. When the door closes, the auxiliary plunger is pressed against the strike plate, automatically deadlocking the latch for improved protection against unauthorized entry. Dead latch locks are typically made from hardened steel or zinc alloy and are available in mortise, tubular, and cylindrical designs for various door applications.