English Explanatory Dictionary

castle nut

English dictionary entry

Meanings

noun
  1. A nut with rounded extensions projecting past the nut's opening. A cotter pin is inserted through a hole in the bolt and bent around the castle nut's projections to lock the nut in place.

Word forms

castle nut castle nuts

Etymology

The projections resemble the turrets of a castle.

Synonyms

castellated nut
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