cotter pin

A "cotter pin" is a simple yet effective fastener commonly used in machinery and engineering to prevent parts from loosening.

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Definition

(technical)A U-shaped metal fastener inserted through a hole and bent at the ends to secure parts together.

After inserting the cotter pin through the bolt, he bent the ends to keep it from moving.
The cotter pin ensures that the wheel remains attached even under heavy vibration.

(technical)A split metal pin used to lock a bolt or other fastener in place by bending its ends after insertion.

The mechanic used a cotter pin to secure the nut on the axle.
Cotter pins are essential in maintaining the integrity of mechanical assemblies.

Terms that have similar or relatively close meanings to "cotter pin":