Machine Design
The longitudinal joint in boilers is used to get the required

Length of boiler
Length and diameter of boiler
Diameter of boiler
Efficiency of boiler

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Machine Design
Set screws are

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

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