{"product_id":"sumitomo-1657w0y-pcbn-turning-insert-diamond-bn250","title":"Sumitomo 1657W0Y Pcbn Turning Insert Diamond BN250","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SUMITOMO 1657W0Y is a polycrystalline cubic boron nitride (PCBN) turning insert designed for precision machining of hard and difficult-to-cut materials. This uncoated insert features a 35-degree diamond shape (V-style) with a negative rake geometry and belongs to the Series V product line under ANSI designation 2MDVNMA331. With an inscribed circle of 0.375 inches and a corner radius of 0.0156 inches (1\/64 inch), it delivers tight tolerances in finishing and semi-finishing applications. The BN250 grade PCBN substrate provides high hardness and thermal stability suited for interrupted and continuous cuts on hardened steels and hard materials. Machinists and CNC turning specialists install this insert in compatible toolholders on turning centers.\u003c\/p\u003e\u003cp\u003eThis insert is intended for turning operations on hard workpiece materials, including hardened steels and other materials classified under secondary workpiece material code H. The 2MD-VNMA insert style and ISO designation 2MD-VNMA160404 confirm compatibility with toolholders designed around this geometry. With only 2 cutting edges, the insert is positioned for applications where edge precision and material hardness resistance are the primary requirements. Typical use cases include finishing passes on hardened components in production turning environments where surface finish and dimensional accuracy are critical.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePCBN substrate (BN250 grade) provides exceptional hardness for cutting hard materials\u003c\/li\u003e\n\u003cli\u003eUncoated insert with negative rake for controlled chip formation on hardened steels\u003c\/li\u003e\n\u003cli\u003e35-degree diamond insert shape with 2 cutting edges for precision turning\u003c\/li\u003e\n\u003cli\u003eCorner radius of 0.0156 inches supports fine surface finish requirements\u003c\/li\u003e\n\u003cli\u003eMaximum depth of cut of 0.020 inches suited for finishing and light semi-finishing\u003c\/li\u003e\n\u003cli\u003eClamp and pin holding method for secure, repeatable insert seating\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in toolholders accepting the 2MD-VNMA insert style per ANSI designation 2MDVNMA331 and ISO designation 2MD-VNMA160404. Suitable for hard material turning applications (material grade C4, secondary workpiece material code H) on CNC turning centers.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or CNC tooling technician with the machine powered off and in a locked-out state. Ensure the toolholder pocket and seating surfaces are clean and free of debris before inserting. Use the specified clamp and pin holding method to achieve proper clamping torque per the toolholder manufacturer guidelines. Verify insert orientation and rake angle alignment before resuming cutting operations.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Polycrystalline Cubic Boron Nitride (PCBN)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: BN250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: C4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Shape\u003c\/strong\u003e: Diamond (V)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 35 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: 2MD-VNMA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eANSI Code\u003c\/strong\u003e: 2MDVNMA331\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO Code\u003c\/strong\u003e: 2MD-VNMA160404\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 0.375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Length\u003c\/strong\u003e: 0.122 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Thickness\u003c\/strong\u003e: 0.1875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.0156 inches (1\/64 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 0.150 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Depth of Cut\u003c\/strong\u003e: 0.020 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Cutting Edges\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRake\u003c\/strong\u003e: Negative\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 0 degrees\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\u003eChip Breaker\u003c\/strong\u003e: A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Uncoated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Clamp and Pin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecondary Workpiece Material\u003c\/strong\u003e: Hard Material (H)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI, ISO 13399\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: V\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SUMITOMO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 1657W0Y\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SUMITOMO","offers":[{"title":"Default Title","offer_id":51727227388210,"sku":"1657W0Y","price":1425.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5fab6ef2ab2ebe58ec7c9da277d8f5b7.jpg?v=1788675011","url":"https:\/\/voomisupply.com\/products\/sumitomo-1657w0y-pcbn-turning-insert-diamond-bn250","provider":"Voomi Supply","version":"1.0","type":"link"}