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
1.57 d
1.2 d

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Machine Design
The face of the tooth is the

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

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