Definition

Noun: 1. A component of a lock: A pin tumbler is a small cylindrical object, typically one of several within a lock mechanism. It is split into two parts (a driver pin and a key pin) that are pushed into place by springs. The correct key aligns the split between these parts with the lock's shear line, allowing the lock to turn.

Usage

• The pin tumbler is the core security component in most modern cylinder locks.
• A locksmith must carefully insert each pin tumbler into its chamber when assembling the lock.
• The precision of the pin tumblers determines how difficult the lock is to pick.

Advanced Usage

• Pin tumbler principle: Refers to the locking mechanism invented by Linus Yale Jr., which uses a set of pin stacks of varying lengths.
• Pin tumbler lock: A complete lock that operates using the pin tumbler mechanism. (Note: This is a compound term listed here as it is the primary application of the component).

Variants and Related Words

• Tumbler: A more general term for any movable obstruction in a lock that must be adjusted to a specific position by the key.
• Driver pin: The upper part of a pin tumbler, constantly pushed down by a spring.
• Key pin: The lower part of a pin tumbler, which makes direct contact with the key.

Synonyms

• Lock pin
• Tumbler pin

Related Phrases

• To shear the pins: A locksmithing/picking term for aligning the split between the driver and key pins at the shear line.
• Pin stack: Another term for the assembled unit of a driver pin, spring, and key pin within the lock cylinder.

Noun

1. cylindrical tumblers consisting of two parts that are held in place by springs; when they are aligned with a key the bolt can be thrown