Machine Design
In unilateral system of tolerance, the tolerance is allowed on

Both sides of the actual size
Both sides of the nominal size
One side of the actual size
One side of the nominal size

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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
Similar to stud
Slotted for a screw driver and generally used with a nut

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