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:
1890–95

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cotter pin
 
n
1.  a split pin secured, after passing through holes in the parts to be attached, by spreading the ends
2.  a tapered pin threaded at the smaller end and secured by a nut after insertion

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The ears of the cotter pin had apparently broken and allowed the cotter pin.
The accident occurred when the injured worker's vest was caught by the cotter
  pin.
On the other hand, a missing cotter pin in a critical location such as in a
  connecting rod could have serious consequences.
The earlier configuration incorporates a fixed shaft and cotter pin with a
  different aluminum impeller.
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