Machine Design
If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

1.5 × diameter of bolt
1.25 × diameter of bolt
Diameter of bolt
0.75 × diameter of bolt

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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 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
Tolerance grade for the shaft is 6 and for the hole is 5

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