flat ring of rubber metal etc used under a bolt to give tightness
Crossword Clue

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AnswerCrossword Clue
washerflat ring of rubber, metal, etc., used under a bolt to give tightness
washersA small flat ring made of metal, rubber, or plastic fixed under a nut or the head of a bolt to spread the pressure when tightened or between two joining surfaces as a spacer or seal