Machine Design
A bolt

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

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Machine Design
In hydrodynamic bearings

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

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