Machine Design
Allen bolts are

Designed for shock load
Self locking bolts
Used in aircraft application
Provided with hexagonal depression in head

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Machine Design
In composite or reverse laid ropes

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

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