Machine Design
When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

Sum of the initial tension and external load applied
External load applied
Initial tension or external load, whichever is greater
Initial tension

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Machine Design
When a belt drive is transmitting maximum power,

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

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