Machine Design
The shear plane in case of bolts should

Be across threaded portion of shank
Be normal to threaded portion of shank
Never be across the threaded portion
Be parallel to axis of bolt

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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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