Machine Design
In static loading, stress concentration is more serious in

Elastic materials
Brittle as well as ductile materials
Ductile materials
Brittle materials

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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
Used to prevent relative motion between two parts
Slotted for a screw driver and generally used with a nut
Similar to stud

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