Machine Design
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

Castle nut
Sawn nut
Ring nut
Jam nut

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Machine Design
In composite or reverse laid ropes

Wires in two adjacent strands are twisted in opposite direction
Direction of twist of wires and strands are same
Wires are not twisted
Direction of twist of wires in strands is opposite to the direction of twist of strands

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