A cotter is a pin or wedge with a flat bearing surface passing through a hole to fix parts tightly together. In British usage cotter pin has the same meaning, [1] but in the U.S. it means a split pin. Typical applications are in fixing a crank to its crankshaft, as in a bicycle, and a piston rod to a crosshead, as in a steam engine.

A cotter pin is a wedge or pin that is inserted through aligned holes in the components to secure them temporarily. In the USA, the cotter pin is also known as a split pin or cotter key. The cotter or split pin is made of thick wire with a semicircular cross-section.

Secure clevis pins, connect components, or add a pull handle; also known as key rings. Choose from our selection of cotter pins, including over 1,000 products in a wide range of styles and sizes. Same and Next Day Delivery.

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A split pin, also known as a cotter pin, or cotter key in the US, [1] is a metal fastener with two tines that are bent during installation, similar to a staple or rivet. Typically made of thick wire with a half-circular cross section, split pins come in multiple sizes and types.

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Jun 18, 2024 · In simple terms, a cotter pin is a pin or a wedge that passes through a hole to fix the various components in their place. In the U.S., cotter pins are also known as split pins or cotter keys. Each cotter pin is made out of thick wire with a semicircular cross-section.

Dec 12, 2024 · A cotter pin, essentially, is a pin-shaped wedge that opens up once you’ve placed the pin through a hole in your bolt or fastener. The larger, rounded head on the pin prevents it from slipping all the way through the hole.

Cotter pins, also called split pins, insert into holes in clevis pins, shafts, and other components to lock components in place. They feature a split-end design that inserts through the mounting surface, expands on the back side, and is folded back to prevent the pin from pulling out.