Machine Design
Allen bolts are

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

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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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Machine Design
The flank of the tooth is the

Surface of the tooth above the pitch surface
Surface of the top of the tooth
Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface

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