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

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

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Machine Design
Spring index is

Its capability of storing energy
Indication of quality of spring
Ratio of coil diameter to wire diameter
Load required to produce unit deflection

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