Machine Design
Stress concentration factor is defined as the ratio of

Maximum stress to the nominal stress
Maximum stress to the endurance limit
Nominal stress to the endurance limit
Nominal stress to the maximum stress

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Machine Design
A bolt

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

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