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Question


A castle nut is a locking device in which


Options:
A .  a thinner nut is tightened down over a thicker or main nut and the main nut is tightened against the thinner nut by loosening
B .  a slot is cut in line with the centre of each face and a split pin passes through two slots in the nut and a hole in the bolt, so that a positive lock is obtained unless the pin shears
C .  a slot is cut about half way through the nut and a small screw is tightened between the nut and the bolt in order to produce more friction
D .  the bottom cylindrical portion is recessed to receive the tip of the locking set screw
Answer: Option B


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