Machine Design
An alien bolt is

Self locking bolt
Used in high speed components
Same as stud
Provided with hexagonal depression in head

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Machine Design
In cross or regular lay ropes

Wires are not twisted
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
Direction of twist of wires and strands are same

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