{"product_id":"accupro-12181960-corner-radius-end-mill-1-4-in-3-flute","title":"Accupro 12181960 Corner Radius End Mill 1\/4 in 3 Flute","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ACCUPRO 12181960 is a solid carbide corner radius end mill designed for precision milling in ferrous and non-ferrous materials. It features a 1\/4 inch diameter cutting face, a 0.045 inch corner radius, and three right-hand spiral flutes with a 40-degree helix angle. The TiCN coating improves surface hardness and wear resistance for extended tool life in demanding cutting conditions. With a 3\/4 inch length of cut and 2-1\/2 inch overall length, this single-end, centercutting tool is suited for profiling, slotting, and finishing passes where edge integrity and radius consistency are critical. Machinists and toolroom operators specify this geometry when blending floors to walls without sharp corner stress risers.\u003c\/p\u003e\u003cp\u003eThis end mill is used in CNC machining centers and manual mills for precision part production in job shops, production facilities, and toolrooms. The centercutting capability allows plunge entry, expanding its use across interpolated pockets, ramp entry paths, and contour milling. The 1\/4 inch shank diameter fits standard collets and end mill holders commonly found on vertical machining centers and high-speed spindle setups. It is appropriate for cutting aluminum, steel, stainless, and other materials where TiCN coating provides adequate thermal and abrasion protection.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e0.045 inch corner radius reduces stress concentration and improves surface finish at floor-to-wall transitions\u003c\/li\u003e\n\u003cli\u003eTiCN coating provides enhanced hardness and wear resistance compared to uncoated carbide\u003c\/li\u003e\n\u003cli\u003eMicrograin solid carbide substrate supports tight tolerances and rigidity at small diameters\u003c\/li\u003e\n\u003cli\u003e3-flute design balances chip evacuation with rigidity for both roughing and finishing passes\u003c\/li\u003e\n\u003cli\u003eCentercutting geometry allows direct plunge entry without a pre-drilled pilot hole\u003c\/li\u003e\n\u003cli\u003e40-degree helix angle promotes smooth cutting action and reduced chatter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or standard tooling selection for CNC vertical machining centers and manual mills accepting a 1\/4 inch collet or end mill holder.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and tool changes must be performed with the machine spindle fully stopped and the control in an estop or tool-change state. Ensure the shank is fully seated and properly torqued in the collet or holder per the toolholder manufacturer specifications before initiating any cutting cycle. Inspect the corner radius and cutting edges for chips or damage before each use, as carbide tools can micro-fracture under improper storage or handling. Tool runout should be verified with a dial indicator after setup, particularly at small diameters where runout has a proportionally larger effect on cut quality and tool life.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 1\/4 inch (0.2500 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 3\/4 inch\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: 1\/4 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.045 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorner Radius Tolerance\u003c\/strong\u003e: plus or minus 0.0015 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter Tolerance\u003c\/strong\u003e: +0.0000 to -0.0025 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: -0.0001 to -0.0004 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 40 degrees\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\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\u003eCentercutting\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Solid Carbide (Micrograin)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiCN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.06 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: 12181960\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51730023350578,"sku":"12181960","price":55.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5563556e26727f68a303832e19729899.jpg?v=1788710377","url":"https:\/\/voomisupply.com\/products\/accupro-12181960-corner-radius-end-mill-1-4-in-3-flute","provider":"Voomi Supply","version":"1.0","type":"link"}