Machine Design
An alien bolt is

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

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Machine Design
The fatigue stress concentration factor is defined as

The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
All of these
The product of the endurance limits with and without stress concentration

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