{"product_id":"sandvik-coromant-7859256-turning-insert-cnmg643-pr-4415","title":"Sandvik Coromant 7859256 Turning Insert CNMG643-PR 4415","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SANDVIK COROMANT 7859256 is a CNMG-style indexable turning insert designed for metal cutting on CNC and manual lathes. It carries the ISO designation CNMG 19 06 12-PR 4415 and belongs to the T-Max P series. The insert features an 80-degree diamond (rhombic) shape with a neutral hand orientation and a negative side clearance. The carbide substrate is CVD-coated with a TiCN, Al2O3, and TiN multilayer stack, providing high wear resistance suited to roughing and medium machining operations. Four usable cutting edges extend tool life between insert changes.\u003c\/p\u003e\u003cp\u003eThis insert is engineered for turning steel (ISO P) as its primary workpiece material and cast iron (ISO K) as its secondary workpiece material. The PR chip breaker geometry is optimized for roughing to medium machining passes. It is typically used in external turning applications on production lathes in both job-shop and high-volume manufacturing environments. The T-Max P series is a widely used platform among machinists running moderate-to-aggressive metal removal rates on ferrous materials.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCVD multilayer coating: TiCN, Al2O3, and TiN for high wear resistance and thermal stability\u003c\/li\u003e\n\u003cli\u003e80-degree diamond insert shape (ISO Shape C) provides a strong cutting edge geometry\u003c\/li\u003e\n\u003cli\u003ePR chip breaker designed for roughing and medium machining on steel\u003c\/li\u003e\n\u003cli\u003eFour cutting edges per insert reduce per-edge tooling cost\u003c\/li\u003e\n\u003cli\u003eNegative side clearance (Clearance Code N) compatible with rigid, top-clamp or screw-lock toolholders\u003c\/li\u003e\n\u003cli\u003eInscribed circle of 0.75 inches (19.05 mm) and corner radius of 0.0469 inches (1.19 mm)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct-use insert for CNMG 643 toolholder pockets in the T-Max P series. Compatible with toolholders accepting CNMG inserts with a 0.312-inch (7.93 mm) hole diameter, clamp or screw holding method, and Tolerance Code M with Clearance Code N. ISO size code 190612.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before seating or indexing the insert. Use the correct torque driver for the clamping screw to ensure positive seating without cracking the carbide substrate. Inspect the insert pocket and seating surface for chips or debris before each edge change.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eANSI Insert Code\u003c\/strong\u003e: CNMG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO Insert Code\u003c\/strong\u003e: CNMG190612\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO Full Designation\u003c\/strong\u003e: CNMG 19 06 12-PR 4415\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: T-Max P\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Shape\u003c\/strong\u003e: C - Diamond (Rhombic) 80 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: 4415\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: TiCN, Al2O3, TiN (CVD process)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChip Breaker\u003c\/strong\u003e: PR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChip Breaker Operation\u003c\/strong\u003e: Roughing, Medium Machining\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Neutral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSide Clearance\u003c\/strong\u003e: Negative\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance Code\u003c\/strong\u003e: N\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTolerance Code\u003c\/strong\u003e: M\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Cutting Edges\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 0.75 inches (19.05 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.0469 inches (1.19 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Thickness\u003c\/strong\u003e: 0.25 inches (6.35 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 0.312 inches (7.93 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Clamp, Screw\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\u003eWiper Edge\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 5.08 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 2.13 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight\u003c\/strong\u003e: 0.53 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.06 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23242105\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: 7859256\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SANDVIK COROMANT","offers":[{"title":"Default Title","offer_id":51755324440882,"sku":"7859256","price":67.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/adbec394d4f86a78adae52f8cabc07dc_4681a60a-a7a0-48ce-beeb-eedade1ac6cc.jpg?v=1788953673","url":"https:\/\/voomisupply.com\/products\/sandvik-coromant-7859256-turning-insert-cnmg643-pr-4415","provider":"Voomi Supply","version":"1.0","type":"link"}