Machine Design
Cold working

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

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Machine Design
Machine screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between two parts
Similar to stud

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