The coarseness can be≤ Ra0.8
Accuracy:H2,test guage accuracy 6H,highest accuracy can reach 5H
Material:HSSCo and HSSCo(France CPM) Hardness: 63-65HRC
when you mache the blind hole by useing the forming tap,you do not need clean the chip and burrs.
The cutting speed is faster than common tap with flute ,about two times.
Hole Dia=Diameter-p/2(p= pitch)