Machine Design
Resistance to fatigue of a material is measured by

Elastic limit
Young's modulus
Endurance limit
Coefficient of elasticity

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Machine Design
A tap bolt

Has head at one end and other end fits into a tapped hole in the other part to be joined
Has 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 oilness bearings

Grease required to be applied after some intervals
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

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