Machine Design
A stud

Has pointed threads
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

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Machine Design
In hydrostatic bearings

The oil film is maintained by supplying oil under pressure
Do not require external supply of lubricant
The Oil film pressure is generated only by the rotation of the journal
Grease is used for lubrication

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