Machine Design
The connecting rod bolts are tightened up with initial tension greater than the external load so that

Bolts are weakest elements
The resultant load on the bolt would not be affected by the external cyclic load
Joint may not open up
Bolts will not loosen during service

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Machine Design
According to Indian standard specifications, 100 H6/g5 means that

Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
Tolerance grade for the hole is 6 and for the shaft is 5
Tolerance grade for the shaft is 6 and for the hole is 5

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