Machine Design
A tap bolt

Has both the ends threaded
Has pointed threads
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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Machine Design
The fatigue stress concentration factor is defined as

The product of the endurance limits with and without stress concentration
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
All of these
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration

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