{"product_id":"walter-6636303-turning-insert-vbmt331-mm4-wmp20s-carbide","title":"Walter 6636303 Turning Insert VBMT331-MM4 WMP20S Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe WALTER 6636303 is a VBMT331-MM4 WMP20S solid carbide turning insert designed for precision metal removal on CNC lathes and turning centers. It carries a CVD-applied multilayer TiCN\/Al2O3\/TiCN coating under the WMP20S proprietary grade, delivering wear resistance and thermal stability across a broad range of cutting conditions. The 35-degree diamond shape (Insert Shape Code V) provides a sharp, acute cutting geometry suited to profiling and finishing passes. With a 3\/8-inch inscribed circle, 3\/16-inch thickness, and a 1\/64-inch corner radius, the insert fits standard VBMT-style toolholders and offers two usable cutting edges per insert.\u003c\/p\u003e\n\u003cp\u003eThis insert is rated for primary use on steel (ISO P25) and stainless steel (ISO M20), with secondary capability on super-alloys and titanium (ISO S20). It is suited to turning, facing, boring, and back-turning operations in both production and job-shop environments. The MM4 chipbreaker geometry and positive rake angle of 7 degrees support controlled chip formation during moderate to light cuts, with a maximum depth of cut of 0.078 inches (2.00 mm). Screw-type insert holding keeps the insert locked securely in the pocket during interrupted or continuous cuts.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCVD multilayer TiCN\/Al2O3\/TiCN coating for elevated wear and crater resistance\u003c\/li\u003e\n  \u003cli\u003eWMP20S grade rated for steel (P25), stainless steel (M20), and super-alloys\/titanium (S20)\u003c\/li\u003e\n  \u003cli\u003e35-degree diamond insert shape with positive rake and honed cutting edge for reduced cutting forces\u003c\/li\u003e\n  \u003cli\u003eMM4 chipbreaker geometry supports turning, facing, boring, and back-turning\u003c\/li\u003e\n  \u003cli\u003eTwo cutting edges per insert; screw-clamp holding method\u003c\/li\u003e\n  \u003cli\u003eComplies with ANSI and ISO standards; ISO code VBMT160404-MM4 WMP20S\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in VBMT-style screw-clamp toolholders accepting a 3\/8-inch inscribed circle insert. Compatible with turning centers and CNC lathes running steel, stainless steel, super-alloys, and titanium workpieces. Industry standard number VBMT331-MM4 WMP20S confirms fit across ANSI- and ISO-compliant toolholder systems.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is stopped and the turret is indexed to a safe position before seating or replacing inserts. Verify the insert pocket and seating surface are clean and free of chips before tightening the clamping screw to avoid rocking or improper seating. Inspect the cutting edge condition at regular intervals and index or replace the insert before tool failure causes workpiece damage or toolholder wear.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: VBMT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: VBMT-MM4 Tiger Tec\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Shape\u003c\/strong\u003e: Diamond 35 (Shape Code V)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncluded Angle\u003c\/strong\u003e: 35 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Grade\u003c\/strong\u003e: WMP20S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiCN \/ Al2O3 \/ TiCN (CVD multilayer)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInscribed Circle\u003c\/strong\u003e: 3\/8 inch (0.3750 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Length\u003c\/strong\u003e: 0.654 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Thickness\u003c\/strong\u003e: 3\/16 inch (0.1875 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 1\/64 inch (0.0157 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHole Diameter\u003c\/strong\u003e: 0.173 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Depth of Cut\u003c\/strong\u003e: 0.078 inches (2.00 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\u003eInsert Hand\u003c\/strong\u003e: Neutral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRake Angle\u003c\/strong\u003e: 7 degrees (Positive)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRelief Angle\u003c\/strong\u003e: 5 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Edge Style\u003c\/strong\u003e: Honed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChipbreaker\u003c\/strong\u003e: MM4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Holding Method\u003c\/strong\u003e: Screw\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClearance Code\u003c\/strong\u003e: B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTolerance Code\u003c\/strong\u003e: M\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInsert Size Code\u003c\/strong\u003e: 331\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel, Stainless Steel (ISO P; M)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecondary Workpiece Material\u003c\/strong\u003e: Super-alloys and Titanium (ISO S)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: M20, P25, S20\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Use Application\u003c\/strong\u003e: Turning, Facing, Boring, Back Turning\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eISO Code\u003c\/strong\u003e: VBMT160404-MM4 WMP20S\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ANSI, ISO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23242105\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.022 pounds\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: WALTER\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 6636303\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WALTER","offers":[{"title":"Default Title","offer_id":51972943184178,"sku":"6636303","price":50.33,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a3d827f2ebdacdff2f7959c1d1b7ec19.jpg?v=1789971320","url":"https:\/\/voomisupply.com\/products\/walter-6636303-turning-insert-vbmt331-mm4-wmp20s-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}