Machine Design
In a hydrodynamic lubricated bearing

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

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Machine Design
Machine screws are

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

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