{"product_id":"accupro-319921-ball-end-mill-1-4-in-3-flute-solid-carbide","title":"Accupro 319921 Ball End Mill 1\/4 in 3 Flute Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ACCUPRO 319921 is a single-end ball end mill designed for precision profiling, contouring, and 3D milling operations in a wide range of materials. Built from micrograin solid carbide, it offers the rigidity and edge retention needed for demanding cutting applications. The 1\/4 inch cutting diameter pairs with a 3\/8 inch length of cut and a 4 inch overall length, giving it the reach necessary for detailed work in deeper cavities. A 37-degree right-hand spiral helix promotes efficient chip evacuation and reduces cutting forces. The ZrN (zirconium nitride) coating adds surface hardness and heat resistance, extending tool life in both ferrous and non-ferrous materials. This tool is installed and operated by machinists and CNC tooling specialists.\u003c\/p\u003e\n\u003cp\u003eThis end mill is suited for CNC milling centers and manual knee mills requiring a 1\/4 inch shank. The 2-1\/8 inch reach length makes it practical for profiling pockets, contoured surfaces, and complex 3D geometry where a shorter tool would not clear the workpiece. It is appropriate for use in aluminum, steel, stainless steel, and similar materials where a ZrN-coated carbide tool is specified. The single-end configuration is standard for toolholders requiring a straight shank. Right-hand cutting direction is compatible with conventional CNC spindle rotation.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eMicrograin solid carbide construction for superior edge retention and rigidity\u003c\/li\u003e\n  \u003cli\u003eZrN coating increases surface hardness and extends tool life in ferrous and non-ferrous applications\u003c\/li\u003e\n  \u003cli\u003e37-degree right-hand spiral helix promotes chip evacuation and reduces heat buildup\u003c\/li\u003e\n  \u003cli\u003e3 flutes balance chip clearance and cutting edge count for smooth finishes\u003c\/li\u003e\n  \u003cli\u003e2-1\/8 inch reach length allows access to deeper pockets without interference\u003c\/li\u003e\n  \u003cli\u003eTight shank diameter tolerance (+0.0001\/-0.0004 inches) ensures consistent toolholder fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a direct-fit replacement for 1\/4 inch shank ball end mill applications on CNC machining centers and manual mills accepting a 1\/4 inch straight shank toolholder.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Seat the shank fully into the toolholder and tighten to the holder manufacturer's specified procedure. Verify runout with a dial indicator before beginning any cut to confirm proper seating and avoid premature tool wear or breakage.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 1\/4 inch (0.2500 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 3\/8 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4 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\u003eReach Length\u003c\/strong\u003e: 2-1\/8 inches (2.1250 inches)\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: 37 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Mill Material\u003c\/strong\u003e: Micrograin Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: ZrN (Zirconium Nitride)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSingle or Double End\u003c\/strong\u003e: Single\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExtended Reach\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVariable Helix\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\u003eMill Diameter Tolerance\u003c\/strong\u003e: +0.000\/-0.002 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: +0.0001\/-0.0004 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.25 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 27112803\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: ACCUPRO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 319921\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ACCUPRO","offers":[{"title":"Default Title","offer_id":51736323096882,"sku":"319921","price":121.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/75af5a461cb79e369acb0dec1c3d1cfa.jpg?v=1788777214","url":"https:\/\/voomisupply.com\/products\/accupro-319921-ball-end-mill-1-4-in-3-flute-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}