DTM Ex ternal face g roo vin g a n d t u rn i n g RE CW 6˚ INSL Ref. h P Steel  M Stainless  K Cast iron  N Non-ferrous S Superalloys  : First choice : Second choice H Hard materials Coated External AH7025 AH8005 Seat Designation CW±0.05 RE INSL h size Internal DTM3-030 3 3 0.3   20 5 DTM4-040 4 4 0.4   20 5 DTM4-080 4 4 0.8   20 5 Face DTM5-080 5 5 0.8   25 5.5 DTM6-080 6 6 0.8   25 5.5 : Line up Parting DTE Ex ternal face g roo vin g a n d t u rn i n g ( for h i gh pre c i s io n ) RE CW 7˚ INSL Ref. h P Steel   M Stainless  K Cast iron   N Non-ferrous S Superalloys  : First choice : Second choice H Hard materials Coated Cermet AH7025 Seat NS9530 Designation GH130 CW±0.02 RE INSL h AH725 T9225 size DTE265-015 3 2.65 0.15      20 5 DTE300-020 3 3 0.2      20 5 DTE300-040 3 3 0.4      20 5 DTE315-015 3 3.15 0.15      20 5 DTE400-040 4 4 0.4      20 5 DTE400-080 4 4 0.8      20 5 DTE415-015 4 4.15 0.15      20 5 DTE478-055 5 4.78 0.55      25 5.5 DTE500-040 5 5 0.4      25 5.5 DTE500-080 5 5 0.8      25 5.5 DTE515-015 5 5.15 0.15     25 5.5 DTE600-080 6 6 0.8     25 5.5 DTE600-120 6 6 1.2     25 5.5 : Line up Reference pages: Toolholders → 6-12 - 6-16, Standard cutting conditions → 6-26 6-22