The 654711 Cotter Pin is a small mechanical locking fastener used in Continental aircraft engine assemblies. Supplied in a pack of 100 pieces, it is designed to secure castellated nuts, clevis pins, and other fasteners by preventing them from loosening during vibration and engine operation.

Cotter pins are inserted through aligned holes in a bolt or pin and then bent to lock the assembly in place, providing a simple but highly reliable mechanical safety lock.

Its primary functions include:

Locking nuts and fasteners in position to prevent loosening
Providing a mechanical safety retention method in engine assemblies
Ensuring reliability under vibration and thermal cycling

Cotter pins like the 654711 are essential safety components in aircraft engines, ensuring critical fasteners remain securely locked during operation.