9 MILLING GRADES – OVERVIEW Marking of grades M 9 3 2 5 Operation type Coating / Substrate Generation ISO range D Drilling 0 PVD Special1 CVDapplication 1 – 9 01 – 05 M Milling 2 PVD Free3 CVD 05 – 10 T Turning 4 PVD Group K, H5 CVD 10 – 20 GroovingGandParting off 6 PVD Group M, S7 CVD 20 – 30 8 PVD Universal 30 – 40 9 CVD B CBN 40 – 50 D PCD 764