{"product_id":"hertel-e4041020-square-end-mill-5-16-in-4-flute-cobalt","title":"Hertel E4041020 Square End Mill 5\/16 in 4 Flute Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL E4041020 is a cobalt square end mill designed for milling operations in metalworking and machining environments. Built from M42 cobalt high-speed steel, it delivers heat and wear resistance that outlasts standard HSS tooling when cutting alloy steels, stainless, and other tough materials. The mill features a 5\/16 inch cutting diameter, a 2 inch length of cut, and a TiN (titanium nitride) coating that reduces friction and extends tool life. With 4 flutes and a right-hand cutting and flute direction, it produces a clean finish on a variety of ferrous and non-ferrous materials. Centercutting geometry allows direct plunge entry without a pre-drilled hole.\u003c\/p\u003e\u003cp\u003eThis end mill is suited for use on vertical machining centers, knee mills, and manual milling machines in job shop, production, and maintenance machining environments. The 3\/8 inch shank diameter fits standard R8, collet, and end mill holder setups common to most manual and CNC milling equipment. The 3-3\/4 inch overall length provides adequate reach for standard depth pocketing, slotting, and profiling operations. It is used by machinists and tool-and-die professionals working in both production and prototype applications.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eM42 cobalt construction for improved heat resistance over standard M2 HSS tooling\u003c\/li\u003e\n\u003cli\u003eTiN finish reduces friction and increases surface hardness at the cutting edge\u003c\/li\u003e\n\u003cli\u003eCentercutting design allows direct plunge milling without pilot drilling\u003c\/li\u003e\n\u003cli\u003e4-flute configuration balances chip evacuation and surface finish quality\u003c\/li\u003e\n\u003cli\u003eRight-hand cut and right-hand helix for standard milling machine spindle compatibility\u003c\/li\u003e\n\u003cli\u003e3\/8 inch shank fits widely available collet chucks and end mill holders\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-fit replacement end mill for standard 3\/8 inch collet, R8, and end mill holder setups on vertical milling machines and CNC machining centers.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and tool changes must be performed with the spindle fully stopped and the machine powered down or e-stopped. Seat the shank fully into the collet or holder and tighten to the tool holder manufacturer's specified torque range using a calibrated torque wrench where required. Inspect the tool for runout with a dial indicator before beginning a cut. Worn or damaged collets increase runout and accelerate tool wear — replace collets showing visible wear or out-of-round distortion.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 5\/16 inch (0.3125 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 3\/8 inch (0.375 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3-3\/4 inches (3.75 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: M42\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: TiN (Titanium Nitride)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentercutting\u003c\/strong\u003e: Yes\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\u003eWeight\u003c\/strong\u003e: 0.05 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: HERTEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: E4041020\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51749378621746,"sku":"E4041020","price":79.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/43d8e324f222c3bff81eb44b9acb6491.jpg?v=1788905294","url":"https:\/\/voomisupply.com\/products\/hertel-e4041020-square-end-mill-5-16-in-4-flute-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}