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 6 and for the hole 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
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of path of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch

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