{"product_id":"hertel-e2051016-square-end-mill-0-25-in-4-flute-cobalt","title":"Hertel E2051016 Square End Mill 0.25 in 4 Flute Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL E2051016 is a cobalt square end mill designed for milling operations in ferrous and tough alloy materials. Built from M42 cobalt high-speed steel, it resists heat buildup during aggressive cuts. The tool measures 0.25 inches in cutting diameter with a 0.625-inch length of cut, a 0.375-inch shank diameter, and a 3.375-inch overall length. The 4-flute, 30-degree right-hand spiral configuration provides efficient chip evacuation and a smooth surface finish. This is an uncoated, double-end design, allowing the tool to be flipped and reused once one end wears. Licensed machinists and tool-and-die professionals typically select this end mill for standard-reach slotting and peripheral milling tasks.\u003c\/p\u003e\n\u003cp\u003eThe E2051016 is suited for use in manual mills and CNC machining centers handling steel, stainless steel, cast iron, and similar materials where cobalt tooling provides the edge retention that standard HSS cannot sustain. The regular-length profile fits conventional tool holders and collet chucks with a 0.375-inch bore. This end mill is a practical choice for job shops, maintenance machining, and production environments where tool longevity under heat is a priority. It is not center-cutting, so it is not intended for direct plunge operations.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eM42 cobalt construction for improved heat resistance and edge retention over standard HSS\u003c\/li\u003e\n  \u003cli\u003eDouble-end design extends usable tool life — flip when first end wears\u003c\/li\u003e\n  \u003cli\u003e4-flute spiral geometry with 30-degree helix angle for smooth finish and efficient chip flow\u003c\/li\u003e\n  \u003cli\u003eRight-hand cut and right-hand flute for use in standard spindle configurations\u003c\/li\u003e\n  \u003cli\u003eUncoated surface — compatible with cutting fluids and oils without coating delamination concerns\u003c\/li\u003e\n  \u003cli\u003eNot center-cutting — intended for peripheral milling and slotting, not plunge entry\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-use square end mill for standard 0.375-inch collet chucks, end mill holders, and tool blocks used in vertical and horizontal milling machines.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by qualified machinists or tooling technicians. Ensure the machine spindle is fully stopped and the drawbar or collet nut is fully released before inserting or removing the tool. Seat the shank to the full recommended depth in the holder and torque the collet nut or set screw to the holder manufacturer's specification. Verify runout with a dial indicator before commencing a cut, as excessive runout accelerates edge wear and degrades surface finish.\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\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.625 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.375 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.375 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)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 30 degrees\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\u003eEnd Type\u003c\/strong\u003e: Double End\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCenter Cutting\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength Type\u003c\/strong\u003e: Regular\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.504 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: E2051016\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51727227257138,"sku":"E2051016","price":40.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/27e959e2bdbd798fe2c4062ec6a534e9.jpg?v=1788675005","url":"https:\/\/voomisupply.com\/products\/hertel-e2051016-square-end-mill-0-25-in-4-flute-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}