Machine Design
Cap screws are

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

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Machine Design
In oilness bearings

The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
Grease required to be applied after some intervals

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Machine Design
A stud

Has pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded
Has a head on one end and a nut fitted to the other

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