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A cotter pin, or split pin, is a metal fastener with two tines that, when bent during installation, serves as a reliable locking mechanism to prevent nuts, bolts, clevis pins, and other fasteners from unintentionally loosening or disengaging. Widely used in automotive, aviation, construction, and machinery applications, cotter pins are versatile and easy to visually inspect. They are inserted through corresponding holes in fasteners and secured by bending their tines in opposite directions, providing a visible and secure locking solution. Their simplicity, ease of installation, and reusability make cotter pins a popular choice for safety-critical scenarios where preventing the accidental disassembly of components is crucial.