Pin tumbler lock

"Tumbler lock" redirects here. For other uses, see Lever tumbler lock and Disc tumbler lock.

The pin tumbler lock, also known as the Yale lock (after Linus Yale Jr) is a lock mechanism that uses a series of spring-loaded pins of varying lengths to prevent the lock from opening without the correct key. When the correct key is inserted the pins align precisely, allowing the plug within the lock cylinder to rotate freely, thereby unlocking the mechanism. If the wrong key is used, the pins remain misaligned, preventing the plug from turning and securing the lock against unauthorized access. It is one of the most widely used and enduring lock mechanisms in the world.

Pin tumblers are most commonly employed in cylinder locks, but may also be found in tubular pin tumbler locks (also known as radial locks or ace locks).

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