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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What is a Cotter Pin? 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.

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.

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A split pin, also known in the United States as a cotter pin or cotter key, 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.

Split cotter pins, or cotter keys, create a secure lock in a clevis fastener system and through nuts and bolts with drilled holes for a cotter pin to be installed. Cotter pins are easy to use, requiring only a pair of pliers to install and uninstall.

Engineered for accuracy and reliability, split pins—also known as cotter pins—are a mainstay in mechanical engineering. Designed to keep fasteners like nuts in their rightful place, these small yet incredibly efficient pins that split serve as a fastening system in applications requiring a moderate level of security.