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castellated nut

a tall lock nut, having on its outer face radial slits allowing for insertion of a cotter pin or wire in both the nut and a hole in its bolt, so as to prevent the nut from coming loose.
Also called castle nut.
Origin of castellated nut
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Historical Examples
  • 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

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