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ALL meanings of castellated nut

cas·tel·lat·ed nut
C c
  • noun castellated nut a nut that has indentations similar to battlements 3
  • noun 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. 1
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