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

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

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Machine Design
Crowning on pulley helps

In increasing the slip of the belt
In decreasing the slip of the belt
To increase pulley life
To keep the belt in centre on a pulley while it is in motion

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