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.

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Jan 5, 2026 · A split pin, often called a cotter pin, is a straightforward, low-cost mechanical fastener designed to secure two items together and prevent a primary fastener from loosening under vibration …

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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 …

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Split pins, often called split cotter pins, hairpin cotters, or R-clips, are actually a sub-type of cotter pin. Unlike basic cotter pins, which are used to secure components with a through-hole, such as nuts and …