Machine Design
An alien bolt is

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

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Machine Design
When a belt drive is transmitting maximum power,

Effective tension is half of centrifugal tension
Effective tension is equal to centrifugal tension
Driving tension on slack side is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension

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