Machine Design
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

168 d
124 d
138 d
151 d

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Machine Design
Set 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 parts
Similar to stud
Slotted for a screw driver and generally used with a nut

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