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

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

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Machine Design
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

Equating shearing resistance to the crushing resistance of the rivets
Equating tearing resistance of the plate to the shearing resistance of the rivets
None of these
Equating tearing resistance of the plate to the crushing resistance of the rivets

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