Machine Design
The connecting rod bolts are tightened up so that tightening stress

Is about yield point divided by safety factor
Approaches yield point
Is just sufficient to hold parts together
Is 50% of yield point

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Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter smaller than the diameter of the unthreaded portion
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

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