Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

1.8 d
0.8 d
1.2 d
1.57 d

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

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