名詞 locknut:

1. supplementary nut that is screwed down on a primary nut to prevent it from loosening
   同義詞：safety nut

locknut lock nut

n.（名詞）
A usually thin nut screwed down on another nut to prevent it from loosening.
防松螺母：常指擰緊在另一個(gè)螺母上的防止其松動(dòng)的細(xì)螺母
A self-locking nut.
自鎖螺母