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      SAP Material Number 1157420
      ISO Catalog Number KRR658680
      ANSI Catalog Number KRR658680
      Grade KC850
      [W] Insert Width 19.0500 mm
      [W] Insert Width .7500 in
      [L10] Insert Cutting Edge Length 31.7500 mm
      [L10] Insert Cutting Edge Length 1.250 in
      [S] Insert Thickness 12.7000 mm
      [S] Insert Thickness .5000 in
      [Rε] Corner Radius 4.7630 mm
      [Rε] Corner Radius .1875 in
      [D1] Insert Hole Size 7.8700 mm
      [D1] Insert Hole Size .3100 in
      B Gamma [BGAMMA] 0.5080 mm
      B Gamma [BGAMMA] .0200 in
      See all Product Variants

      Workpiece Materials

      P Steel
      M Stainless Steel

      Features and benefits

      Kennametal stocks a complete line of standard inserts for wheel and axle machining. Inserts are available in various styles, sizes, and grades.

      • Wheel boring — molded chipbreaker inserts in round, square, octagon, and regrindable inserts.

      • Axle turning — triangle- and diamond-shaped inserts with chipbreakers.

      • Wheel turning — rectangular and square styles, with or without molded chipbreakers.

      • Wheel turning — round buttons with center hole for locking.

      Machine Side


      Workpiece Side



      • K40
        P Steel
        K Cast Iron
      • KC5115RR
      • KC5125RR
        P Steel
      • KC850

        composition: A CVD tri-phase coating on an extra-strong, cobalt-enriched
        alloyed substrate.
        application: Designed for heavy cutting of low-, medium-, and high-carbon
        steels, medium hardness alloy and tool steels, stainless steels, and some
        high-temperature alloys. Excellent thermal and mechanical shock resistance
        makes grade KC850 ideally suited for difficult drilling applications.
        Used in inserts for Kendex/Metcut drill bodies.

        P Steel
        M Stainless Steel
      • KC9110RR
      • KC9115RR
      • KC9125RR
        P Steel
      • KC950


      • KCP25

        Composition: A tough cobalt-enriched carbide grade with a newly designed multilayer MTCVD-TiCN-Al2O3 coating with superior interlayer adhesion.
        Application: Best general-purpose turning grade for most steels and ferritic and martensitic stainless steels. The substrate design ensures adequate deformation resistance with excellent insert edge strength. Coating layers offer good wear resistance over a wide range of machining conditions and the post-coat treatment minimises microchipping and improves coating adhesion to substrate leading to long tool life and improved workpiece finishes.

        P Steel
        K Cast Iron
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