Machine Design
An alien bolt is

Provided with hexagonal depression in head
Same as stud
Used in high speed components
Self locking bolt

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Machine Design
In a hydrodynamic lubricated bearing

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

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