{"product_id":"sandvik-coromant-7861257-turning-insert-tnmm333-qr-4425","title":"Sandvik Coromant 7861257 Turning Insert TNMM333-QR 4425","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SANDVIK COROMANT 7861257 is a TNMM333-QR 4425 grade solid carbide turning insert from the T-Max P series, designed for external and internal turning operations on CNC lathes and turning centers. The insert carries a CVD-applied multilayer coating of Al2O3, TiCN, and TiN, which provides thermal resistance and wear protection across a range of cutting conditions. The inscribed circle measures 3\/8 inches and the corner radius is 0.0469 inches. The trigon shape with a 60-degree included angle and neutral hand orientation makes it suitable for general-purpose turning where versatile approach angles are required. Installation is by clamp or screw holding methods.\u003c\/p\u003e\n\u003cp\u003eThis insert is intended for turning applications on workpiece materials classified under ISO material groups P (steel) and K (cast iron). It fits standard TNMM-style toolholders and is well-suited for medium to rough turning passes where edge security and coating durability matter. The QR chip breaker geometry supports chip control across a range of depths of cut and feed rates. It is used by machinists and CNC operators in production and job-shop environments handling ferrous components.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCVD multilayer coating: Al2O3, TiCN, and TiN for thermal and abrasion resistance\u003c\/li\u003e\n  \u003cli\u003eTrigon insert shape with 60-degree included angle and 0-degree relief angle (clearance code N)\u003c\/li\u003e\n  \u003cli\u003e3\/8-inch inscribed circle with 0.0469-inch corner radius\u003c\/li\u003e\n  \u003cli\u003eNeutral hand orientation for flexible toolholder compatibility\u003c\/li\u003e\n  \u003cli\u003eQR chip breaker geometry for medium-duty chip control\u003c\/li\u003e\n  \u003cli\u003eCompatible with clamp and screw holding methods\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in TNMM-style toolholders compatible with the T-Max P series. Suitable for ISO P and K workpiece material groups. ISO designation TNMM 16 04 12-QR 4425.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified machinists or CNC setup technicians. Always power down and lock out the machine before indexing or replacing inserts. Confirm toolholder seating and clamp or screw torque per the toolholder manufacturer specification before resuming cutting. Inspect the insert pocket and seating surfaces for chips or debris prior to installation to ensure proper insert support.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: TNMM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Shape\u003c\/strong\u003e: Trigon (T)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 60 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 3\/8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.0469 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Thickness\u003c\/strong\u003e: 3\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 0 degrees (Clearance Code N)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTolerance Code\u003c\/strong\u003e: M\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Neutral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: 4425\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\u003eChip Breaker\u003c\/strong\u003e: QR (M geometry)\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: ISO P (Steel), ISO K (Cast Iron)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: T-Max P\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO Code\u003c\/strong\u003e: TNMM 16 04 12-QR 4425\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Size Code\u003c\/strong\u003e: 160412\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23242105\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1 insert per package\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 10\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.44 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Dimensions\u003c\/strong\u003e: 3.74 inches (L) x 1.54 inches (W) x 0.44 inches (H)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: 7861257\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SANDVIK COROMANT","offers":[{"title":"Default Title","offer_id":51748197990706,"sku":"7861257","price":244.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d03fb124d5233f59c3bf62651d627769.jpg?v=1788890221","url":"https:\/\/voomisupply.com\/products\/sandvik-coromant-7861257-turning-insert-tnmm333-qr-4425","provider":"Voomi Supply","version":"1.0","type":"link"}