cotter pincotter pin
a metal fastener consisting of a pin bent back on itself so as to form a head opposite the two ends: it is designed to be slipped through a slot and its ends then spread apart to hold it in place
A split cotter inserted through a hole or holes and bent at the ends to fasten two or more parts together.
(plural cotter pins)
- A split pin, the ends of which project through an object being fastened and are bent back to hold it in place