castle nut

noun

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.

Similar
castellated nut
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Meanings

nouncastle nut (plural castle nuts)

plural castle nuts

  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.

    Synonyms: castellated nut

Synonyms & antonyms

nounA 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.

Similar
castellated nut

Origin

The projections resemble the turrets of a castle.

Full word history & related roots →

Translations

Danish kronemøtrik
  • kronemøtriknut with rounded extensions projecting past the nut's opening
Finnish kruunumutteri
  • kruunumutterinut with rounded extensions projecting past the nut's opening
Cite this entry
APA

castle nut. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/castle%20nut

MLA

“castle nut.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/castle%20nut. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “castle nut,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/castle%20nut.

Source: castle nut on Wiktionary, CC BY-SA 4.0.