Mill 4-12KT™ Metric Carbide Milling Inserts
The Mill 4-12(KT) metric tangential shoulder milling cutters are a fantastic choice for steel and cast-iron roughing and finishing applications. They require up to 15% less horsepower, enabling increased feed rates even on 40 taper machines. With a depth-of-cut range up to .472" (12mm), the Mill 4-12KT can bring new versatility to your shoulder milling applications. The advanced insert/pocket interface ensures stability and consistent performance in difficult applications. Its proprietary designs offer minimal axial runout delivering excellent floor finish—easy insert indexing through screw clamping.
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P Steel (21)
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P0Low-Carbon Steels, Long Chipping C < .25%; <125 HB; <530 N/mm^2 UTS (21)
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P1Low-Carbon Steels, Short Chipping C < .25%; <125 HB; <530 N/mm^2 UTS (21)
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P2Medium and High Carbon Steels C < .25%; <220 HB; <25 HRC; >530 N/mm^2 UTS (21)
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P3Alloy Steels & Tool Steels C > .25%; <330 HB; <35 HRC; 600-850 N/mm^2 UTS (21)
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P4Alloy Steels & Tool Steels C > .25%; 350-420 HB; 35-43 HRC; 850-1400 N/mm^2 UTS (21)
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P5Ferritic, Martensitic, and PH Stainless Steels <330 HB; <35 HRC; 600-900 N/mm^2 UTS (21)
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P6High Strength Ferritic, Martensitic, and PH Stainless Steels 350-450 HB; 35-43 HRC; 900-2400 N/mm^2 UTS (21)
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M Stainless Steel (21)
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M1Austenitic Stainless Steel 130-200 HB; <600 N/mm^2 UTS (21)
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M2High Strength Austenitic Stainless and Cast Stainless Steels 150-230 HB; <25 HRC; >600 N/mm^2 UTS (21)
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M3Duplex Stainless Steel 135-275 HB; <30 HRC; 500-1200 N/mm^2 UTS (21)
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K Cast Iron (21)
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K1Gray Cast Iron 120-290 HB; <32 HRC; 125-500 N/mm^2 UTS (21)
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K2Low and Medium Strength CGI and Ductile Irons 130-260 HB; <28 HRC; <600 N/mm^2 UTS (21)
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K3High Strength Ductile and Austempered Ductile Iron 180-350 HB; <43 HRC; >600 N/mm^2 UTS (21)
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S High-Temp Alloys (21)
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S1Iron-Based, Heat-Resistant Alloys 160-260 HB; 25-48 HRC; 500-1200 N/mm^2 UTS (21)
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S2Cobalt-Based, Heat-Resistant Alloys 250-450 HB; 25-48 HRC; 1000-1450 N/mm^2 UTS (21)
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S3Nickel-Based, Heat Resistant Alloys 160-450 HB; <48 HRC; 600-1700 N/mm^2 UTS (21)
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S4Titanium and Titanium Alloys 300-400 HB; 33-43 HRC; 900-1600 N/mm^2 UTS (21)
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H Hardened Materials (21)
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H1Hardened Materials 44-48 HRC (21)
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Face Milling (21)
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Shoulder Milling (21)
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Shoulder Roughing (14)
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Shoulder Square End (7)
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1.969 in (3)
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2.48 in (4)
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3.15 in (3)
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3.938 in (3)
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4.921 in (3)
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6.299 in (3)
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7.875 in (2)
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50.0 mm (3)
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63.0 mm (4)
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12.125 mm (3)
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12.15 mm (18)
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0.478 in (3)
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0.479 in (18)
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1.575 in (7)
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1.969 in (6)
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2.48 in (8)
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40.0 mm (7)
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50.0 mm (6)
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63.0 mm (8)
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A-Socket Head Cap Screw (14)
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B-Cutter Retention Screw (2)
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C-Bolt Circle (5)
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1.575 in (7)
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1.969 in (6)
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2.48 in (8)
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40.0 mm (7)
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50.0 mm (6)
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63.0 mm (8)
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0.016 in (21)
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0.4 mm (21)
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0.8 mm (21)
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1.201 mm (21)
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1.55 mm (21)
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1.975 mm (21)
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2.375 mm (21)
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3.176 mm (21)
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KC522M (21)
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KC725M (21)
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KCK15 (21)
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KCK20 (21)
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KCK20B (21)
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KCPK30 (21)
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KCPM40 (21)
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KCSM40 (21)
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X00626 (21)
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0.008 (2)
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0.01 (3)
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0.013 (3)
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0.016 (3)
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0.026 (4)
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0.042 (3)
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22.0 mm (7)
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27.0 mm (3)
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40.0 mm (6)
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0.866 in (7)
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1.063 in (3)
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1.575 in (6)
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2.362 in (2)