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
M6 - 8d

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
A tap bolt

Has a head on one end and a nut fitted to the other
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

ANSWER DOWNLOAD EXAMIANS APP