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
Cold working

Has no influence on fatigue strength
Decreases the fatigue strength
Increases the fatigue strength
Alone has no influence on fatigue strength

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