slot washer

noun

Definition of slot washer

  1. 1 :  a lock washer having a slot cut in its edge to permit the driving of a nail or screw through it after the nut has been tightened to prevent the bolt or nut from turning

  2. 2 :  a washer slotted through from the outside to the central hole so that it may be inserted or removed with the bolt in place

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