lockpin

Example:She inserted the lockpin into the lock and turned it to secure the door.

Definition:A mechanism for securing a door, cabinet, etc., by turning a key or operating a lever, etc.

Example:The locksmith replaced the lockpin and reworked the lock to prevent the old one from working.

Definition:A person who makes, repairs, and cracks locks, and who has special knowledge of keys and the tools and machinery for dealing with locks.

Example:The locksmith examined the lock cylinder to determine why the lockpin wasn’t aligning properly.

Definition:A device in a lock that contains the mechanism (as tumblers) that is operated by a key and that may have a spring-loaded pin to prevent sticking when the key is turned.