Machine Design
The piston rod of a steam engine is usually connected to the cross-head by means of

Cotter joint
Universal joint
Knuckle joint
Bolted joint

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Machine Design
Set screws are

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

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