When using a bolt, lock washer, and nut, which side of the nut(one side of a nut usually has a slightly larger surface area than the other) should be in contact with the lock washer?
by 
F Dubya
ANSWERS: 2
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the side with the flattest/largest surface area
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If u observe carefully the side opposite to the larger area has chamfering (edges are smooth). This is to prevent scratches to fingers while fastening the nut. Hence it is always better that the larger side should be in contact with the lock washer. This also helps in increasing the resistance to self unlocking.
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