{"product_id":"osg-hp421-3150-square-end-mill-0-315-in-2-flute-carbide","title":"Osg HP421-3150 Square End Mill 0.315 in 2 Flute Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG HP421-3150 is a solid carbide square end mill from the HP421 series, designed for precision milling in demanding metal-cutting applications. It features a 0.315-inch (8.00 mm) cutting diameter, a 0.8268-inch (21.00 mm) length of cut, and a 35-degree helix angle with a spiral flute geometry. The TiAlN coating provides thermal resistance and extended tool life in high-speed and dry machining conditions. With two flutes and centercutting capability, this end mill handles plunge cuts, slotting, profiling, and peripheral milling in a single tool. It is suited for use by machinists, toolroom operators, and CNC programmers working with ferrous and non-ferrous materials.\u003c\/p\u003e\u003cp\u003eThe HP421-3150 is used in CNC machining centers and manual milling machines for precision contouring, slotting, and full-width cutting operations. The micrograin carbide substrate combined with TiAlN finish makes it well-suited for harder workpiece materials where heat generation is a concern. It operates with right-hand cut and right-hand flute direction, which is standard for the majority of CNC and manual spindle configurations. Typical applications include die and mold work, aerospace component machining, and general precision part production requiring tight tolerances and consistent surface finish.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e0.315-inch (8.00 mm) cutting diameter with 0.8268-inch (21.00 mm) length of cut\u003c\/li\u003e\n\u003cli\u003eSolid micrograin carbide construction for rigidity and wear resistance\u003c\/li\u003e\n\u003cli\u003eTiAlN coating for thermal protection and extended tool life in high-speed cutting\u003c\/li\u003e\n\u003cli\u003e35-degree helix angle with spiral flute geometry for efficient chip evacuation\u003c\/li\u003e\n\u003cli\u003eCentercutting design allows plunge entry into workpiece material\u003c\/li\u003e\n\u003cli\u003eRight-hand cut and right-hand flute direction for standard spindle compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard shank end mill with an 8.00 mm shank diameter, compatible with ER-style collet chucks, hydraulic toolholders, and shrink-fit holders sized for 8 mm shanks commonly used in CNC machining centers.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and tool changes should be performed by a qualified machinist or CNC operator with the machine spindle fully stopped and the control in a safe state. Ensure the collet or toolholder bore is clean and free of chips before seating the shank. Verify runout with a dial indicator after tool installation, as excessive runout will accelerate wear and compromise surface finish. Follow machine tool manufacturer guidelines for spindle speed, feed rate, and depth-of-cut parameters appropriate to the workpiece material.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Diameter\u003c\/strong\u003e: 0.315 inches (8.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.8268 inches (21.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 64.00 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 8.00 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\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\u003c\/strong\u003e: TiAlN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 35 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\u003eCentercutting\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: HP421\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.2 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: OSG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: HP421-3150\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51755316642098,"sku":"HP421-3150","price":76.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/5b2c1e8c9fe5c9957248c11a7af6dc3e.jpg?v=1788953513","url":"https:\/\/voomisupply.com\/products\/osg-hp421-3150-square-end-mill-0-315-in-2-flute-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}