{"product_id":"accupro-311509-corner-radius-end-mill-5-16-in-solid-carbide","title":"Accupro 311509 Corner Radius End Mill 5\/16 in Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 311509 is a solid carbide corner radius end mill designed for precision milling in demanding metalworking applications. It features a 5\/16 inch diameter with a 1 inch length of cut and a 3 inch overall length. The five-flute geometry with a 38-degree helix angle promotes efficient chip evacuation and smooth cutting action. An AlCrTiN coating provides high heat resistance and extended tool life in hard and abrasive materials. The variable index design reduces harmonic vibration, improving surface finish quality. Center cutting capability allows direct plunging into the workpiece. This tool is intended for use by machinists and CNC operators in production and job shop environments.\u003c\/p\u003e\u003cp\u003eThe 311509 is suited for side milling, slotting, and profile milling operations where a radiused corner is required to reduce stress concentrations at part corners. The micrograin solid carbide substrate supports high-speed machining in steels, stainless steels, cast irons, and similar ferrous materials. The single-end configuration and right-hand cut with right-hand flute direction make it a direct fit for standard CNC machining center and manual mill setups. Applications span aerospace, automotive, die and mold, and general precision component manufacturing.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e5-flute design increases chip load capacity and improves surface finish over standard 4-flute tools\u003c\/li\u003e\n\u003cli\u003eAlCrTiN coating delivers superior oxidation resistance and hardness at elevated cutting temperatures\u003c\/li\u003e\n\u003cli\u003e38-degree helix angle promotes aggressive chip evacuation and reduces cutting forces\u003c\/li\u003e\n\u003cli\u003eVariable index geometry dampens vibration and chatter during high-speed cuts\u003c\/li\u003e\n\u003cli\u003eCenter cutting construction allows direct plunge entry without pre-drilling\u003c\/li\u003e\n\u003cli\u003eMicrograin solid carbide substrate provides rigidity and wear resistance in ferrous materials\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct-use corner radius end mill compatible with standard 5\/16 inch collet or end mill holder tooling systems on CNC machining centers and manual knee mills.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or CNC operator. Ensure the machine spindle is fully stopped and locked out before changing tooling. Use a properly sized collet or end mill holder and torque to the tool holder specification per the manufacturer guidelines. Verify runout with a dial indicator before beginning production cuts to confirm seating and minimize tool deflection.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 5\/16 inches (0.3125 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 (25.40 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3 inches (76.2 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 5\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.0100 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 38 degrees\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: Micrograin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: AlCrTiN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Type\u003c\/strong\u003e: Corner Radius\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\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\u003eVariable Index\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentercutting\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle or Double End\u003c\/strong\u003e: Single\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter Tolerance\u003c\/strong\u003e: +0.000000 \/ -0.001000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.03 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: ACCUPRO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 311509\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51753194783026,"sku":"311509","price":82.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6df43177ba0e1b7b447a236ba9e5264f.jpg?v=1788933746","url":"https:\/\/voomisupply.com\/products\/accupro-311509-corner-radius-end-mill-5-16-in-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}