{"product_id":"sandvik-coromant-7861116-turning-insert-vbmt21-51-uf-4425","title":"Sandvik Coromant 7861116 Turning Insert VBMT21.51-UF 4425","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SANDVIK COROMANT 7861116 is a VBMT21.51-UF 4425 grade carbide turning insert designed for precision finish turning on CNC lathes and turning centers. It features a 35-degree diamond (rhombic) insert shape with a 5-degree relief angle and a neutral hand orientation. The insert carries a CVD-applied multilayer coating of Al2O3, TiN, and TiCN, delivering high wear resistance suited to continuous cuts in steel and interrupted passes in cast iron. With a 0.25-inch inscribed circle and a 0.4 mm corner radius, this insert targets tight-tolerance, fine-surface finishing passes where controlled chip formation is critical. It is installed by CNC machinists and turning specialists in production and job-shop environments.\u003c\/p\u003e\u003cp\u003eThis insert belongs to the CoroTurn 107 series and is engineered primarily for finishing operations on steel workpieces (ISO material group P) with secondary suitability for cast iron (ISO material group K). The UF chip breaker geometry promotes controlled chip flow at light depths of cut and moderate-to-high feed rates typical of finish turning. Toolholders that accept VBMT-style inserts with clamp or screw holding methods are the intended mounting platform. The two cutting edges per insert help reduce cost-per-edge in high-volume production runs.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCVD multilayer coating: Al2O3, TiN, and TiCN for high wear resistance in steel finishing\u003c\/li\u003e\n\u003cli\u003e35-degree diamond (V) insert shape with 5-degree positive relief angle for low cutting forces\u003c\/li\u003e\n\u003cli\u003eUF chip breaker geometry optimized for finishing chip control\u003c\/li\u003e\n\u003cli\u003eNeutral hand orientation for flexible toolholder compatibility\u003c\/li\u003e\n\u003cli\u003eTwo cutting edges per insert\u003c\/li\u003e\n\u003cli\u003eCoroTurn 107 series — compatible with clamp and screw holding systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in CoroTurn 107 series toolholders accepting VBMT-style inserts with clamp or screw holding methods. ANSI insert code VBMT21.51; ISO insert code VBMT 11 02 04.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by qualified CNC machinists or tooling technicians. Power down and lock out the machine spindle before seating or indexing the insert. Seat the insert fully in the pocket and tighten the clamping screw or clamp to the toolholder manufacturer's specified torque using the correct Torx or hex key. Inspect the insert seat and pocket for chips or debris before each insert change to avoid seating errors that can damage the toolholder.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eANSI Insert Code\u003c\/strong\u003e: VBMT21.51\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO Insert Code\u003c\/strong\u003e: VBMT 11 02 04\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Shape\u003c\/strong\u003e: V - Diamond (Rhombic) 35-Degree\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: 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, TiN, TiCN\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: UF (Finishing)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 0.25 inches (0.2500 inches decimal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.4 mm (0.0156 inches decimal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Thickness\u003c\/strong\u003e: 3\/32 inch (0.0938 inches decimal)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 5 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 35 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSide Clearance\u003c\/strong\u003e: Positive\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: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTolerance Code\u003c\/strong\u003e: M\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClearance Code\u003c\/strong\u003e: B\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\u003eSeries\u003c\/strong\u003e: CoroTurn 107\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\u003cli\u003e\n\u003cstrong\u003eMinimum Order Quantity\u003c\/strong\u003e: 10\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: 7861116\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SANDVIK COROMANT","offers":[{"title":"Default Title","offer_id":51731510329650,"sku":"7861116","price":346.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/bfe8306f4924da99cf8b0c61e0a3dd9f_1b234962-7eb9-43e4-a0f6-3d173d5afaeb.jpg?v=1788731944","url":"https:\/\/voomisupply.com\/products\/sandvik-coromant-7861116-turning-insert-vbmt21-51-uf-4425","provider":"Voomi Supply","version":"1.0","type":"link"}