Machine Design
The square threads are usually found on

Feed mechanism of machine tools
Railway carriage couplings
Spindles of bench vices
Screw cutting lathes

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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
A tap bolt

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

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Machine Design
In a hydrodynamic lubricated bearing

The lubricant is forced between the journal and the bearing, by external pressure
There is no lubricant between the journal and the bearing
There is a thin film of lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing

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