A jam nut is a locking device in which

1.	A jam nut is a locking device in which
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» 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

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A jam nut is a locking device in which

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