Machine Design
If threads on a bolt are left hand, threads on nut will be

Right hand with same pitch
Left hand with same pitch
Could be left or right hand
Right hand with fine pitch

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Machine Design
In a hydrodynamic lubricated bearing

There is a thin film of lubricant between the journal and the bearing
There is no lubricant between the journal and the 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

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