{"product_id":"sandvik-coromant-7861066-tcmt221-pm-4425-turning-insert","title":"Sandvik Coromant 7861066 TCMT221-PM 4425 Turning Insert","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SANDVIK COROMANT 7861066 is a TCMT-style triangular turning insert from the CoroTurn 107 series, designed for external turning operations on CNC lathes and turning centers. It features a solid carbide substrate with a CVD-applied multilayer coating of Al2O3, TiCN, and TiN, producing a wear-resistant edge suited for medium to finishing cuts. The insert has a 60-degree included angle, a 0.4 mm corner radius, a 1\/4-inch inscribed circle, and a 1\/8-inch thickness. The PM chip breaker geometry controls chip flow across a wide range of feed rates and depths of cut. Installed by machinists and CNC operators in production and job-shop environments.\u003c\/p\u003e\u003cp\u003eThis insert is engineered primarily for turning steel (ISO material group P) and cast iron (ISO material group K). The CoroTurn 107 series is suited for external profiling, facing, and light finishing passes where consistent surface finish and dimensional accuracy are required. The neutral hand designation means the insert fits both right-hand and left-hand toolholders configured for TCMT geometry. The ISO code for this insert is TCMT 11 03 04-PM 4425, also catalogued under TCMT 221-PM 4425.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCVD multilayer coating: Al2O3, TiCN, and TiN for extended wear resistance and heat management\u003c\/li\u003e\n\u003cli\u003e60-degree triangular insert shape with 3 usable cutting edges per insert\u003c\/li\u003e\n\u003cli\u003e0.4 mm corner radius for a balance of edge strength and surface finish capability\u003c\/li\u003e\n\u003cli\u003ePM chip breaker geometry suited for steel and cast iron turning applications\u003c\/li\u003e\n\u003cli\u003eNeutral hand insert compatible with clamp and screw holding methods\u003c\/li\u003e\n\u003cli\u003eManufacturer grade 4425 optimized for ISO P (steel) primary and ISO K (cast iron) secondary workpiece materials\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eCompatible with TCMT-style toolholders that accept a 1\/4-inch inscribed circle triangular insert with clamp or screw holding. The ISO industry standard number TCMT 11 03 04-PM 4425 can be used to cross-reference compatible toolholder systems. Designed for use in the CoroTurn 107 series tooling platform.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by machinists or CNC setup technicians. Ensure the machine spindle is fully stopped and the turret is locked before seating or indexing the insert. Use the correct torque wrench and screw driver specified for the toolholder to secure the clamp or mounting screw without over-tightening, which can crack the carbide substrate. Inspect the insert pocket and seating surfaces for chips or debris before installing a fresh cutting edge.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: TCMT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Shape\u003c\/strong\u003e: Triangle (60 degrees included angle)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO Code\u003c\/strong\u003e: TCMT 11 03 04-PM 4425\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: 4425\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: CoroTurn 107\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChip Breaker\u003c\/strong\u003e: PM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Al2O3, TiCN, TiN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating Process\u003c\/strong\u003e: CVD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 1\/4 inch (0.2500 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.40 mm (0.0156 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Thickness\u003c\/strong\u003e: 1\/8 inch (0.1250 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 0.1102 inches (2.80 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Cutting Edges\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Neutral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 7 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance Code\u003c\/strong\u003e: C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTolerance Code\u003c\/strong\u003e: M\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel (ISO P)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary Workpiece Material\u003c\/strong\u003e: Cast Iron (ISO K)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Clamp, Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Weight\u003c\/strong\u003e: 0.44 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 3.74 x 1.54 x 0.44 inches\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SANDVIK COROMANT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 7861066\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SANDVIK COROMANT","offers":[{"title":"Default Title","offer_id":51745898496306,"sku":"7861066","price":236.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d984c8a7818954f1cdc6640d9e128210_ddc9584f-ab3e-4629-a6e3-ed7f07626441.jpg?v=1788865709","url":"https:\/\/voomisupply.com\/products\/sandvik-coromant-7861066-tcmt221-pm-4425-turning-insert","provider":"Voomi Supply","version":"1.0","type":"link"}