{"product_id":"osg-hp421-0394-square-end-mill-0-0394-in-2-flute-carbide","title":"Osg HP421-0394 Square End Mill 0.0394 in 2 Flute Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG HP421-0394 is a solid carbide square end mill designed for precision milling in demanding machining environments. With a 0.0394 inch (1.00 mm) cutting diameter and a 0.1181 inch (3.00 mm) length of cut, this tool is built for micro-scale material removal where accuracy is critical. The two-flute spiral geometry and 35-degree helix angle promote efficient chip evacuation and reduce cutting forces. A TiAlN (titanium aluminum nitride) coating improves heat resistance and extends tool life in hard and abrasive workpiece materials. Machinists and CNC operators working on precision components, molds, and fine-detail part features will find this end mill suited to tight-tolerance applications.\u003c\/p\u003e\u003cp\u003eThis end mill fits standard CNC machining center operations requiring a small-diameter, centercutting tool. The 3.00 mm shank diameter and 39.00 mm overall length make it compatible with common collet systems used in vertical machining centers and high-speed spindles. It is appropriate for slotting, profiling, and plunge-entry cuts in ferrous and non-ferrous metals. The right-hand cut and right-hand flute configuration follow standard conventions for the majority of CNC setups. The HP421 series from OSG targets high-performance micro-milling applications where tool rigidity and coating durability are priorities.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e0.0394 inch (1.00 mm) cutting diameter for micro-scale milling operations\u003c\/li\u003e\n\u003cli\u003eSolid carbide micrograin construction for rigidity and wear resistance\u003c\/li\u003e\n\u003cli\u003eTiAlN coating for improved heat resistance in hard materials\u003c\/li\u003e\n\u003cli\u003e35-degree helix angle with spiral flute geometry for efficient chip flow\u003c\/li\u003e\n\u003cli\u003eCentercutting design allows direct plunge entry into the workpiece\u003c\/li\u003e\n\u003cli\u003eRight-hand cut and right-hand flute — standard CNC orientation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in CNC machining centers and high-speed spindles accepting a 3.00 mm shank diameter; part of the OSG HP421 series for high-performance micro-milling applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully stopped and the machine is in a safe state before tool changes. Use a properly sized collet or tool holder matched to the 3.00 mm shank to prevent runout. Confirm runout within acceptable tolerance before engaging the cut, as excessive runout on small-diameter carbide tools can cause immediate tool failure.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 0.0394 inches (1.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.1181 inches (3.00 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 3.00 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 39.00 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\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\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\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: HP421-0394\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51753705865522,"sku":"HP421-0394","price":36.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a2b841b07c5c77bac642460bf4ecd914.jpg?v=1788939782","url":"https:\/\/voomisupply.com\/products\/osg-hp421-0394-square-end-mill-0-0394-in-2-flute-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}