{"product_id":"hertel-e4040016-square-end-mill-1-4-in-4-flute-cobalt-tin","title":"Hertel E4040016 Square End Mill 1\/4 in 4 Flute Cobalt Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL E4040016 is a cobalt square end mill designed for precision milling operations in ferrous and non-ferrous materials. Built from M42 cobalt high-speed steel, it delivers superior heat and wear resistance compared to standard HSS tooling. The 4-flute, spiral design with a 30-degree helix angle promotes efficient chip evacuation and smooth cutting action. A titanium nitride (TiN) finish reduces friction and extends tool life. This is a centercutting end mill, meaning it can plunge directly into workpiece material as well as perform peripheral and slot milling. It is installed and used by machinists and tool-and-die professionals in manual and CNC milling applications.\u003c\/p\u003e\n\u003cp\u003eThe E4040016 fits general-purpose milling on machining centers, knee mills, and CNC mills. With a 0.25-inch mill diameter and a 1.25-inch length of cut, it is well suited for slotting, profiling, and finishing passes in steel, stainless, cast iron, and high-temperature alloys where cobalt tooling outperforms standard HSS. The long-series geometry provides additional reach for deeper pockets and stepped features without tool holder interference.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eM42 cobalt HSS construction for elevated heat resistance during aggressive cuts\u003c\/li\u003e\n  \u003cli\u003eTiN coating reduces friction and extends cutting edge life\u003c\/li\u003e\n  \u003cli\u003e4-flute spiral geometry with 30-degree helix for balanced chip load and smooth finish\u003c\/li\u003e\n  \u003cli\u003eCentercutting design allows direct plunge entry into the workpiece\u003c\/li\u003e\n  \u003cli\u003eRight-hand cut, right-hand flute configuration for standard milling setups\u003c\/li\u003e\n  \u003cli\u003eLong-series length type provides additional reach for deep pockets and stepped features\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-application end mill compatible with standard 3\/8-inch ID end mill holders, collet chucks, and milling machine spindles accepting a 0.375-inch shank diameter.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis end mill is installed by machinists using a compatible end mill holder or collet rated for the 0.375-inch shank diameter. Ensure the machine spindle is fully stopped and locked out before tool changes. Proper runout should be verified with a dial indicator after seating to prevent premature edge wear or tool breakage. Follow machine manufacturer feed and speed recommendations for cobalt tooling when establishing cutting parameters.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\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: 1.25 inches (1-1\/4 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\u003eOverall Length\u003c\/strong\u003e: 3-1\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\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\u003eEnd Mill Material\u003c\/strong\u003e: Cobalt (M42 HSS)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Finish\u003c\/strong\u003e: TiN (Titanium Nitride)\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: Long Series\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVariable Helix\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChipbreaker\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.05 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: E4040016\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51739042906418,"sku":"E4040016","price":41.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c000405c1417604f78a1b24659be23d1.jpg?v=1788808406","url":"https:\/\/voomisupply.com\/products\/hertel-e4040016-square-end-mill-1-4-in-4-flute-cobalt-tin","provider":"Voomi Supply","version":"1.0","type":"link"}