Originally Posted by
Andrew R Stewart
The M6 tap is a 6mm x 1mm per thread. Not .75mm per thread. MY understanding is that the "M" references a single "standard" thread pitch, in this case 1mm per thread. Andy
BTW this type of info is readily available by a quick Google search for tap drill size. (Just like a lot of other info) Andy
M6x1 is coarse thread, M6x0.75 is fine; both are available, but coarse thread is more common. M5 and some of the larger sizes have 3 pitches to choose from, as do some of the larger SAE sizes. So best not to assume.