Machine Design
Allen bolts are

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

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Move towards right of the bearing making metal to metal contact
Move towards left of the bearing making metal to metal contact
Move towards right of the bearing making no metal to metal contact
Have contact at the bottom most of the bearing

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