Inserts Mill 4-12KT™

Kennametal’s Mill 4-12KT tangential shoulder milling inserts offer the innovation needed for aggressive cutting parameters on steel and cast-iron applications. They are engineered with a triangular-shaped margin that provides unprecedented stability. The Mill 4-12KT inserts deliver the lowest cost per cutting edge and increased metal removal rates. Ideal for automotive, energy, and general engineering when shoulder milling and slotting. Select from our comprehensive portfolio that offers a wide range of standard inch and metric sizes.

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    Workpiece Material
    Workpiece Material
    • P Steel (45)
      • P0
        Low-Carbon Steels, Long Chipping C < .25%; <125 HB; <530 N/mm^2 UTS(35)
      • P1
        Low-Carbon Steels, Short Chipping C < .25%; <125 HB; <530 N/mm^2 UTS(35)
      • P2
        Medium and High Carbon Steels C < .25%; <220 HB; <25 HRC; >530 N/mm^2 UTS(35)
      • P3
        Alloy Steels & Tool Steels C > .25%; <330 HB; <35 HRC; 600-850 N/mm^2 UTS(35)
      • P4
        Alloy Steels & Tool Steels C > .25%; 350-420 HB; 35-43 HRC; 850-1400 N/mm^2 UTS(35)
      • P5
        Ferritic, Martensitic, and PH Stainless Steels <330 HB; <35 HRC; 600-900 N/mm^2 UTS(45)
      • P6
        High Strength Ferritic, Martensitic, and PH Stainless Steels 350-450 HB; 35-43 HRC; 900-2400 N/mm^2 UTS(45)
    • M Stainless Steel (45)
      • M1
        Austenitic Stainless Steel 130-200 HB; <600 N/mm^2 UTS(45)
      • M2
        High Strength Austenitic Stainless and Cast Stainless Steels 150-230 HB; <25 HRC; >600 N/mm^2 UTS(45)
      • M3
        Duplex Stainless Steel 135-275 HB; <30 HRC; 500-1200 N/mm^2 UTS(45)
    • K Cast Iron (33)
      • K1
        Gray Cast Iron 120-290 HB; <32 HRC; 125-500 N/mm^2 UTS(33)
      • K2
        Low and Medium Strength CGI and Ductile Irons 130-260 HB; <28 HRC; <600 N/mm^2 UTS(33)
      • K3
        High Strength Ductile and Austempered Ductile Iron 180-350 HB; <43 HRC; >600 N/mm^2 UTS(33)
    • S High-Temp Alloys (45)
      • S1
        Iron-Based, Heat-Resistant Alloys 160-260 HB; 25-48 HRC; 500-1200 N/mm^2 UTS(35)
      • S2
        Cobalt-Based, Heat-Resistant Alloys 250-450 HB; 25-48 HRC; 1000-1450 N/mm^2 UTS(35)
      • S3
        Nickel-Based, Heat Resistant Alloys 160-450 HB; <48 HRC; 600-1700 N/mm^2 UTS(35)
      • S4
        Titanium and Titanium Alloys 300-400 HB; 33-43 HRC; 900-1600 N/mm^2 UTS(45)
    • H Hardened Materials (8)
      • H1
        Hardened Materials 44-48 HRC(8)
    cornerConfiguration
    Corner Radius
    Corner Radius
    • 0.016 in(6)
    • 0.031 in(27)
    • 0.047 in(11)
    • 0.061 in(16)
    • 0.078 in(9)
    • 0.094 in(5)
    • 0.125 in(6)
    Corner Radius MinkomuCorner Radius Max
    Corner Radius
    Corner Radius
    • 0.4 mm(6)
    • 0.8 mm(27)
    • 1.201 mm(11)
    • 1.55 mm(16)
    • 1.975 mm(9)
    • 2.375 mm(5)
    • 3.176 mm(6)
    Corner Radius MinkomuCorner Radius Max
    application
    Grade Of Cutting Tool
    Grade Of Cutting Tool
    • KC522M (11)
    • KC725M (7)
    • KCK15 (7)
    • KCK20B (12)
    • KCPK30 (13)
    • KCPM40 (16)
    • KCSM40 (14)
    Wiper Insert
    Wiper Insert
    • N (75)
    • Y (5)
    frontEnd
    Insert Shape
    Insert Shape
    • L-RECTANGLE 90 (5)
    • L-RECTANGLE ON EDGE 90 (75)
    insertGeometry
    Shape
    Shape
    • L-RECTANGLE 90 (5)
    • L-RECTANGLE ON EDGE 90 (75)
    Chip Breaker CBMD
    Chip Breaker CBMD
    • GE (62)
    • HD (12)
    • PU (6)
    Tolerance Class
    Tolerance Class
    • G (74)
    • P (6)
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