Machine Design
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as

M8
M8 - 6d
M6 - 8d
M6

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Machine Design
Plastic flow in ductile materials

Depends on other considerations
Has no effect on it
Increases the seriousness of static loading stress concentration
Lessens the seriousness of static loading stress concentration

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