Machine Design
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as

Feather key
Wood ruff key
Gib-head key
Flat saddle key

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Machine Design
Plastic flow in ductile materials

Has no effect on it
Increases the seriousness of static loading stress concentration
Lessens the seriousness of static loading stress concentration
Depends on other considerations

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