Machine Design
A double strap butt joint (with equal straps) is

Either in single shear or double shear
Always in double shear
Any one of these
Always in single shear

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Machine Design
Machine screws are

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

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Machine Design
Cold working

Alone has no influence on fatigue strength
Has no influence on fatigue strength
Increases the fatigue strength
Decreases the fatigue strength

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