The Kemmler-numerical code Example: 40  3 . 02  . 20 . 1 Cone Design Diameter Length SK 30 = 30 1 = DIN 2080 SK 40 = 40 Type SK 50 = 50 2 = DIN 69871 A – AD3 = DIN 69871 AD/B01 = OZ-system02 = ER-system VDI . 03 = KPS-system ..VDI 30 = 30..5 = JIS B 6339 A – AD 04 = Weldon6 = JIS B 6339 AD/B05 = Whistle Notch06 = Milling arbors for screw in cutters9 = VDI07 = Adaptor sleeves DIN 6383 . 08 = Adaptor sleeves DIN 6364 09 = Adaptor sleeves for SK 10 = Combi shell mill holders HSK . 11 = Shell mill holders ..A63= A63.. 14 = Drill chuck adaptors DIN 23815 = CNC-drill chucks16 = Quick change tapping chucks17 = Boring bar blanks . 18 = Test arbors 20 = Pull studs .. 61 = OZ without drive slots62 = ER without drive slots . 64 = Milling chuck 70 = Shrink fit chucks H = Hydraulic chucks 14 14.51 2020