{"product_id":"hertel-44839140-roughing-end-mill-3-8-in-4-flute-cobalt-tin","title":"Hertel 44839140 Roughing End Mill 3\/8 in 4 Flute Cobalt Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 44839140 is a single-end roughing end mill designed for aggressive material removal in milling applications. Built from M42 cobalt high-speed steel with a TiN (titanium nitride) coating, it offers increased hardness and heat resistance compared to standard HSS tooling. The 3\/8 inch diameter, 4-flute, coarse-pitch geometry rapidly evacuates chips while reducing chatter during heavy cuts. With a 1-1\/8 inch length of cut and 2-15\/16 inch overall length, it fits standard toolholders and is suited for roughing passes on ferrous and non-ferrous materials. Machinists and tool-and-die professionals rely on this geometry for efficient stock removal before finish passes.\u003c\/p\u003e\u003cp\u003eThis end mill is intended for use in vertical machining centers, knee mills, and manual or CNC milling operations where rapid material removal is the priority. The coarse-pitch flute design breaks chips into smaller segments, reducing cutting forces and heat buildup during deep roughing passes. It is appropriate for slotting, profiling, and peripheral roughing in steel, cast iron, and similar materials. The right-hand cutting and right-hand flute direction make it compatible with conventional spindle configurations found in most shop environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eM42 cobalt HSS construction for elevated red hardness and wear resistance\u003c\/li\u003e\n\u003cli\u003eTiN coating extends tool life and reduces friction at the cutting edge\u003c\/li\u003e\n\u003cli\u003eCoarse-pitch, 4-flute design promotes aggressive chip evacuation during roughing\u003c\/li\u003e\n\u003cli\u003eRight-hand cut and right-hand helix match standard milling machine spindle rotation\u003c\/li\u003e\n\u003cli\u003eSingle-end configuration with 3\/8 inch shank diameter for direct collet or endmill holder mounting\u003c\/li\u003e\n\u003cli\u003eNon-centercutting geometry — requires a pre-drilled or pre-milled entry point for plunge operations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct-fit roughing end mill for standard 3\/8 inch diameter collet chucks, end mill holders, and milling arbors used in CNC and manual milling machines.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist following shop safety protocols. Ensure the machine spindle is fully powered down and locked out before loading or removing tooling. Seat the shank fully in the collet or holder to the specified engagement depth before tightening. Verify runout with a dial indicator after mounting, as excessive runout will accelerate wear on a roughing profile.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter (Fractional)\u003c\/strong\u003e: 3\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter (Decimal)\u003c\/strong\u003e: 0.375 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Mill Material\u003c\/strong\u003e: Cobalt (M42 HSS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiN (Titanium Nitride)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePitch\u003c\/strong\u003e: Coarse\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 1-1\/8 inches (1.1250 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-15\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter (Fractional)\u003c\/strong\u003e: 3\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter (Decimal)\u003c\/strong\u003e: 0.3750 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: -0.0001 to -0.0005 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter Tolerance\u003c\/strong\u003e: +0.00394 to -0.00197 inches\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\u003eSingle or Double End\u003c\/strong\u003e: Single\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentercutting\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtended Reach\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable Helix\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01058 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 27112803\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: HERTEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 44839140\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51732642300210,"sku":"44839140","price":61.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3d67850ca7a0c40c79ce5ac65b082e68.jpg?v=1788745353","url":"https:\/\/voomisupply.com\/products\/hertel-44839140-roughing-end-mill-3-8-in-4-flute-cobalt-tin","provider":"Voomi Supply","version":"1.0","type":"link"}