pin tumbler

1 7.3

A set of small metal pins inside a lock that a key lines up to open it

noun
/pɪn ˈtʌmblər/

Specialized

: cilindro de pasador

When you insert the key, it aligns the pin tumblers to allow the lock to open.

Examples

This is a pin tumbler lock.

The Nutcracker and the Four Realms (2018)
A pin tumbler.

The Nutcracker and the Four Realms (2018)
Pin tumbler locks.

The Nutcracker and the Four Realms (2018)
A pin tumbler is essential for providing security in many types of locks.
The locksmith explained how a pin tumbler mechanism works to keep the door locked.

Synonyms

tumbler

vspin tumbler

Specialized

2 8.4

A small part inside a lock that a key moves to open it

is a specific lock component made of small cylindrical pins aligned by the key

Surface Forms

pin tumbler singular

pin tumblers plural

Morphology

pin + tumbler

The compound is compositionally built from 'pin' + 'tumbler' so a learner can infer it denotes a type of tumbler involving pins (i.e., a lock-related part made of pins). However, the precise mechanical function and the specialised sense of 'tumbler' in locks are technical and less frequent, so a B1 learner knowing the individual words would only partially derive the full meaning without prior exposure.

Etymology

Pin tumbler names a part of a lock made of small metal pins that move up and down inside a moving piece called a tumbler. When the right key lifts the pins so they 'line up', the lock can turn, so the pin tumbler is the part that keeps the lock closed until the correct key is used.