Machine Design
Machine screws are

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

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Machine Design
The angle of twist of shaft is

Inversely proportional to (shaft diameter)⁴
Directly proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)²

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