{"product_id":"accupro-12181984-corner-radius-end-mill-5-16-in-3-flute-carbide","title":"Accupro 12181984 Corner Radius End Mill 5\/16 in 3 Flute Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 12181984 is a solid carbide corner radius end mill designed for precision milling in metal and composite materials. It features a 5\/16-inch diameter, a 3\/4-inch length of cut, and a 0.03-inch corner radius that reduces stress concentration at the cutting edge and extends tool life in demanding applications. The three-flute, right-hand spiral geometry supports efficient chip evacuation while maintaining surface finish quality. With a 40-degree helix angle and a bright, uncoated finish, this end mill is well suited for use in CNC machining centers and manual mills where close-tolerance profiling and slotting are required. It is installed and used by machinists and tool-and-die professionals working in job shops, production environments, and maintenance machining.\u003c\/p\u003e\u003cp\u003eThis end mill is used in applications that require a controlled corner radius on pockets, slots, and profiles to prevent sharp-corner stress risers in the finished workpiece. The centercutting design allows plunge entry, giving the operator flexibility in tool paths without requiring a pre-drilled entry point. The 5\/16-inch shank diameter matches standard collet and end mill holder sizes common on knee mills, vertical machining centers, and CNC routers. The 2-1\/2-inch overall length keeps rigidity high while providing adequate clearance for most standard workholding setups.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e0.03-inch corner radius reduces edge chipping and stress concentration at profiled corners\u003c\/li\u003e\n\u003cli\u003eSolid micrograin carbide construction provides hardness and wear resistance at elevated cutting speeds\u003c\/li\u003e\n\u003cli\u003eThree right-hand spiral flutes promote chip evacuation and maintain surface finish in slotting and profiling\u003c\/li\u003e\n\u003cli\u003e40-degree helix angle improves cutting action and reduces cutting forces on the workpiece\u003c\/li\u003e\n\u003cli\u003eCentercutting capability allows direct plunge entry without a pilot hole\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish suitable for use with a wide range of cutting fluids and materials\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and standard tooling option for CNC machining centers and conventional mills accepting a 5\/16-inch shank end mill holder or collet.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by qualified machinists following standard toolroom practices. Ensure the machine spindle is fully powered down and locked out before inserting or removing any end mill. Seat the shank fully into the collet or end mill holder and torque the retention mechanism according to the holder manufacturer specifications. Verify runout with a dial indicator before beginning a cut to ensure tool life and dimensional accuracy.\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: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 3\/4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-1\/2 inches\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: 0.03 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius Tolerance\u003c\/strong\u003e: plus or minus 0.0015 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter Tolerance\u003c\/strong\u003e: +0.0000 to -0.0025 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: -0.0001 to -0.0004 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 40 degrees\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 Type\u003c\/strong\u003e: Corner Radius\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle or Double End\u003c\/strong\u003e: Single End\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentercutting\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Mill Material\u003c\/strong\u003e: Solid Carbide, Micrograin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended Reach\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable Index\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1 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: ACCUPRO\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 12181984\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51730487542066,"sku":"12181984","price":55.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c923c1ec6dab21011993aeca678cafbd.jpg?v=1788718325","url":"https:\/\/voomisupply.com\/products\/accupro-12181984-corner-radius-end-mill-5-16-in-3-flute-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}