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cotter pin

noun, Machinery.
a cotter having a split end that is spread after being pushed through a hole to prevent it from working loose.
Origin of cotter pin
First recorded in 1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for cotter pin
Historical Examples
  • You couldn't pull a cotter pin with a pair of pliers if you knew what a cotter pin was.

    Unspecialist Murray F. Yaco
  • Won't a cotter pin be cheaper and better in place of that nut?

  • On every bolt use a castellated nut and a cotter pin, or an ordinary nut and a lock washer, so the bolt will not work loose.

    Aviation Engines

    Victor Wilfred Pag
  • Or there may have been a little carelessness when erecting, and a cotter pin omitted.

    The Hero of Panama

    F. S. Brereton
  • The piston pin of the Mercedes is of chrome nickel steel, and is retained in the piston by means of a set screw and cotter pin.

    A History of Aeronautics E. Charles Vivian
British Dictionary definitions for cotter pin

cotter pin

noun (machinery)
a split pin secured, after passing through holes in the parts to be attached, by spreading the ends
a tapered pin threaded at the smaller end and secured by a nut after insertion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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