Jam nut is a locking device in which

1.	Jam nut is a locking device in which
A.	one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B.	a slot is cut partly in middle of nut and then slot reduced by tightening a screw
C.	a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
D.	through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end
Answer» B. a slot is cut partly in middle of nut and then slot reduced by tightening a screw

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Jam nut is a locking device in which

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