Machine Design
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

Greater than 30d
Equal to inside diameter of pipe
Between 20d and 30d
Less than 20d

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

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

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