To machining M8, blank hole reamer processing thread with what specifications of the machine (bottom)?
I don't know if you screw precision processing, is the common thread that was not necessary, the direct use of the 6.5 bit can be, if you have high precision, with 6.3 bit, and then use the straight edge reamer 6.7.
M8X0.75 is in diameter 7.2M8X1 is in diameter 6.9M8X1.25 is in diameter 6.6
A drill with a diameter of 6.7 and a M8 tap (also called a tap). Not reamer. There is in the Baidu library, you enter the "drill thread bottom hole" see,Your 7H in the thread accuracy level is a rough level, there is no need to use reamer, and you find 6.7 of the reamer to find it? The internal thread accuracy is divided into three grades, precision, 4H, medium, 6H, rough, 7H. GB recommended using 6H.
