The two halves of the washer have interlocking wedges, the angle of which exceeds the pitch of the bolt threads. As the bolt is tightened, the higher pitch of the washers pulls the bolt back ...
The bolt is an M42 size with a 40 mm pitch, with grooves cut in both directions to allow left-handed and right-handed nuts to be threaded. The large pitch means that instead of a single continuous ...
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