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

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Machine Design
The flank of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Surface of the top of the tooth

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