{"product_id":"kennametal-4050537-npr331-kcu25-carbide-profiling-insert","title":"Kennametal 4050537 NPR331 KCU25 Carbide Profiling Insert","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe KENNAMETAL 4050537 is a solid carbide profiling and turning insert in the Top Notch series, designed for precision material removal on CNC lathes and turning centers. It carries the NPR331 insert style designation and is manufactured in grade KCU25, a fine-grain carbide substrate finished with an AlTiN coating applied via PVD process. The parallelogram-shaped insert measures 0.7330 inches in length, 0.3750 inches in inscribed circle diameter, and 0.1875 inches thick, with a 0.0156-inch corner radius and a maximum depth of cut of 0.2443 inches. Negative rake geometry and a 55-degree included angle support stable, controlled cuts on a broad range of workpiece materials. Installed by CNC machinists and toolroom operators, it is secured by screw-clamp holding.\u003c\/p\u003e\u003cp\u003eThis insert is suited for profiling and turning operations in both production and job-shop environments. The KCU25 grade with AlTiN PVD coating is engineered for use on steel, stainless steel, cast iron, non-ferrous metals, and superalloys including titanium. With four cutting edges per insert, it delivers multiple tool lives per unit before replacement. The right-hand configuration is the standard orientation for conventional OD turning on most lathes. It is identified under ISO code KNGX220404R25 and also cross-references as NPR331N.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eKCU25 fine-grain solid carbide substrate with AlTiN PVD coating for extended wear resistance\u003c\/li\u003e\n\u003cli\u003eFour usable cutting edges per insert for maximum tool life economy\u003c\/li\u003e\n\u003cli\u003e0.0156-inch (0.40 mm) corner radius suits profiling and contour turning detail work\u003c\/li\u003e\n\u003cli\u003eMaximum depth of cut of 0.2443 inches supports moderate stock removal passes\u003c\/li\u003e\n\u003cli\u003eNegative rake, 55-degree included angle geometry provides stable cutting forces\u003c\/li\u003e\n\u003cli\u003eScrew-clamp insert holding method for secure, repeatable seating in compatible toolholders\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in Top Notch series screw-clamp toolholders accepting the NPR331 insert style. ISO equivalent designation is KNGX220404R25. Cross-reference part number is NPR331N. Verify toolholder pocket specifications before installation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInsert installation should be performed by a qualified machinist or toolroom technician with the machine spindle fully stopped and the turret in a safe index position. Use the appropriate torx or hex key at the manufacturer-specified clamp screw torque range for the toolholder series — do not overtighten, as carbide inserts are brittle and can fracture under uneven clamping loads. Inspect the insert pocket and clamp for chips or debris before seating a new insert. Confirm cutting edge engagement and runout before returning the machine to production feeds and speeds.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: NPR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Size Code\u003c\/strong\u003e: 331N\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape\u003c\/strong\u003e: Parallelogram\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: Fine Grain\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: KCU25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: AlTiN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating Process\u003c\/strong\u003e: PVD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Length\u003c\/strong\u003e: 0.7330 inches (18.62 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth (Inscribed Circle)\u003c\/strong\u003e: 0.3750 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.1875 inches (4.76 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.0156 inches (0.40 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Depth of Cut\u003c\/strong\u003e: 0.2443 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 55 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 0 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRake\u003c\/strong\u003e: Negative\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRake Angle\u003c\/strong\u003e: 10 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Cutting Edges\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Hand\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChipbreaker\u003c\/strong\u003e: Common\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Materials\u003c\/strong\u003e: Steel, Stainless Steel, Cast Iron, Non-Ferrous Metal, Superalloys and Titanium\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eISO Code\u003c\/strong\u003e: KNGX220404R25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplications\u003c\/strong\u003e: Profiling, Turning\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: Top Notch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.05 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: KENNAMETAL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 4050537\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KENNAMETAL","offers":[{"title":"Default Title","offer_id":51746743517490,"sku":"4050537","price":282.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/48a3542cb6c097b6005737ed2784c3b5.jpg?v=1788873290","url":"https:\/\/voomisupply.com\/products\/kennametal-4050537-npr331-kcu25-carbide-profiling-insert","provider":"Voomi Supply","version":"1.0","type":"link"}