Machine Design
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited

Square
Acme
BSW
Buttress

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Machine Design
The fatigue stress concentration factor is defined as

The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
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

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