{"product_id":"hertel-e4041016-square-end-mill-1-4-in-4-flute-cobalt-tin","title":"Hertel E4041016 Square End Mill 1\/4 in 4 Flute Cobalt Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL E4041016 is a 4-flute cobalt square end mill designed for milling ferrous and difficult-to-machine materials in machining center and manual mill applications. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention in demanding cutting conditions. The tool features a TiN (titanium nitride) coating that reduces friction and extends tool life. With a 0.25-inch cutting diameter and a 1.75-inch length of cut, this end mill handles slotting, profiling, and side milling operations. The extra-long overall length of 3.5625 inches provides reach in deep-cavity applications where standard-length tooling falls short.\u003c\/p\u003e\u003cp\u003eThis end mill is suited for job shops, tool rooms, and production environments running steel, stainless, cast iron, and similar alloys. The 30-degree right-hand spiral flute geometry promotes chip evacuation and smooth cutting action. Center-cutting capability allows direct plunge entry without a pre-drilled pilot hole, giving machinists flexibility in tool paths. It is installed by machinists and CNC operators in milling machines, machining centers, and manual knee mills using a collet or end mill holder matched to the 0.375-inch shank diameter.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eM42 cobalt HSS construction for heat resistance and extended tool life in tough alloys\u003c\/li\u003e\n\u003cli\u003eTiN coating reduces friction and improves wear resistance at the cutting edge\u003c\/li\u003e\n\u003cli\u003e4 right-hand spiral flutes at 30-degree helix angle for efficient chip evacuation\u003c\/li\u003e\n\u003cli\u003eCenter-cutting design permits direct plunge milling without pre-drilling\u003c\/li\u003e\n\u003cli\u003eExtra-long length of cut (1.75 inches) reaches deep slots and cavities\u003c\/li\u003e\n\u003cli\u003eRight-hand cut and right-hand flute configuration for standard spindle rotation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in collet chucks, end mill holders, and milling adapters accepting a 0.375-inch shank diameter. Suitable for milling machines and CNC machining centers running right-hand spindle rotation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis tooling is installed by machinists using an appropriate end mill holder or precision collet sized to the 0.375-inch shank. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify runout with a dial indicator after installation to confirm concentricity and prevent premature edge wear. Follow machine tool manufacturer torque specifications when tightening the tool holder drawbar or collet nut.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 0.25 inches (1\/4 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 1.75 inches (1-3\/4 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.5625 inches (3-9\/16 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.375 inches (3\/8 inch)\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\u003c\/strong\u003e: TiN (Titanium Nitride)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 30 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\u003eLength Type\u003c\/strong\u003e: Extra Long\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.07 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: E4041016\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51751565623602,"sku":"E4041016","price":82.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/b6696cb69f8d4bbd03feb67732f1f2bf.jpg?v=1788923818","url":"https:\/\/voomisupply.com\/products\/hertel-e4041016-square-end-mill-1-4-in-4-flute-cobalt-tin","provider":"Voomi Supply","version":"1.0","type":"link"}