Machine Design
When a bolt is subjected to an external load, the stress induced in the bolt will be

Shear stress
Combined tensile and shear stress
Tensile stress
Any one of these

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Machine Design
In oilness bearings

Do not require external supply of lubricant
The oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure
Grease required to be applied after some intervals

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