(from the article `pin fastener`) The split cotter pin is used to prevent nuts from turning on bolts and to keep loosely fitting pins in place. The head of the nut has radial slots ...
Used as a locking device in clevis pins, castellated nuts and slotted nuts with drilled bolts. Ends available in various types such as 'extended mitre end', etc.
[n] - a cotter consisting of a split pin that is secured (after passing through a hole) by splitting the ends apart
noun a cotter consisting of a split pin that is secured (after passing through a hole) by splitting the ends apart
a cotter having a split end that is spread after being pushed through a hole to prevent it from working loose.