{"product_id":"kennametal-3899137-corner-radius-end-mill-3-8in-5-flute-altin","title":"Kennametal 3899137 Corner Radius End Mill 3\/8in 5 Flute Altin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe KENNAMETAL 3899137 is a solid carbide corner radius end mill designed for high-performance milling in demanding metalworking applications. It features a 3\/8 inch diameter with a 0.015 inch corner radius that protects cutting edges and reduces chipping during aggressive passes. With 5 flutes and a high helix angle of 38 degrees, it delivers efficient chip evacuation and smooth surface finishes. The single-end tool has a 1 inch length of cut and a 3 inch overall length. An AlTiN (aluminum titanium nitride) PVD coating provides thermal resistance and hardness, extending tool life when cutting abrasive and heat-generating workpiece materials. Licensed HVAC techs and machinists in production and toolroom environments rely on this geometry for both roughing and finishing operations.\u003c\/p\u003e\u003cp\u003eThis end mill is built for cutting steel, stainless steel, cast iron, superalloys, titanium, and hard materials. It fits the UCDE series and is compatible with HC 20M through HC 32M hydraulic sleeves metric with inch bores. The straight cylindrical shank at 3\/8 inch diameter seats securely in standard end mill holders and collet chucks used in CNC machining centers and manual mills. Right-hand cut and right-hand flute direction match the majority of production milling setups. It is suited for both roughing passes and finish milling where corner protection is required.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e5-flute spiral geometry supports both roughing and finishing material removal\u003c\/li\u003e\n\u003cli\u003e0.015 inch corner radius reduces edge chipping and extends tool life on hard materials\u003c\/li\u003e\n\u003cli\u003eAlTiN PVD coating provides high thermal resistance for dry or minimal-coolant cutting\u003c\/li\u003e\n\u003cli\u003e38-degree high helix angle promotes efficient chip evacuation\u003c\/li\u003e\n\u003cli\u003eSubmicron carbide grade delivers hardness and edge retention in abrasive workpiece materials\u003c\/li\u003e\n\u003cli\u003eNo chipbreaker and normal pitch design simplifies programming and setup\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003ePart of the KENNAMETAL UCDE series. Compatible with HC 20M through HC 32M hydraulic sleeves metric with inch bores. Designed for use on steel, stainless steel, cast iron, superalloys, titanium, and hard materials (ISO material codes P, M, K, S, H).\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or toolroom professional. Secure the straight cylindrical shank fully within the holder to the recommended gauge line before torquing the retention mechanism according to the holder manufacturer specifications. Verify spindle runout is within acceptable limits before beginning a cut, as excessive runout accelerates edge wear on fine corner radii. This tool is not center-cutting, so plunge milling is not recommended without a pre-drilled entry point.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 3\/8 inches (0.3750 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 1 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 3\/8 inches (0.3750 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.015 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 38 degrees (High)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Type\u003c\/strong\u003e: Corner Radius\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle or Double End\u003c\/strong\u003e: Single\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Mill Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: Submicron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: AlTiN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating Classification\u003c\/strong\u003e: PVD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentercutting\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChipbreaker\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter Tolerance\u003c\/strong\u003e: +0.000000 \/ -0.002000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: +0.00000 \/ -0.00035 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel, Stainless Steel, Cast Iron, Superalloys and Titanium, Hard Material\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: UCDE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.159 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 27112803\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: 3899137\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KENNAMETAL","offers":[{"title":"Default Title","offer_id":51755782897970,"sku":"3899137","price":204.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6ef429a5eb94ed215fe01e9ef8bbdf13_ae24ca3f-8466-4486-a348-8fbd722ce6d2.jpg?v=1788959637","url":"https:\/\/voomisupply.com\/products\/kennametal-3899137-corner-radius-end-mill-3-8in-5-flute-altin","provider":"Voomi Supply","version":"1.0","type":"link"}