Machine Design
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

Jam nut
Sawn nut
Castle nut
Ring nut

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Machine Design
Plastic flow in ductile materials

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

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Machine Design
Machine screws are

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

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