Machine Design
When a bolt is subjected to an external load, the stress induced in the bolt will be

Combined tensile and shear stress
Shear stress
Tensile stress
Any one of these

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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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