Machine Design
Allen bolts are

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

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Machine Design
In composite or reverse laid ropes

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

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