{"product_id":"hertel-e2039016-square-end-mill-0-25-in-4-flute-cobalt","title":"Hertel E2039016 Square End Mill 0.25 in 4 Flute Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL E2039016 is a cobalt square end mill designed for milling operations in ferrous and difficult-to-machine materials. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention that standard HSS tooling cannot match. The cutter runs a 0.25 inch diameter with a 0.625 inch length of cut, a 0.375 inch shank diameter, and a 2.4375 inch overall length. Four right-hand spiral flutes at a 30-degree helix angle provide efficient chip evacuation and a smooth cutting action. The uncoated finish suits applications where coating buildup or heat transfer would be concerns. Licensed machinists and tool-and-die professionals are the primary users.\u003c\/p\u003e\u003cp\u003eThis end mill is suited for general milling work including slotting, profiling, and pocket milling in steel, stainless, and other tough alloys. The regular length geometry and 0.625 inch length of cut support a wide range of standard machining setups on vertical mills and CNC machining centers. The centercutting design allows plunge entry directly into the workpiece without a pre-drilled hole, adding versatility to the tool path. The 0.375 inch shank is a common size for collet chucks and standard toolholders in production and job-shop environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eM42 cobalt construction for heat resistance and edge retention in tough alloys\u003c\/li\u003e\n\u003cli\u003eFour right-hand spiral flutes at 30-degree helix for efficient chip evacuation\u003c\/li\u003e\n\u003cli\u003eCentercutting design allows direct plunge entry without pre-drilling\u003c\/li\u003e\n\u003cli\u003eUncoated finish maintains dimensional accuracy in heat-sensitive applications\u003c\/li\u003e\n\u003cli\u003eRegular length geometry fits standard collets and toolholders\u003c\/li\u003e\n\u003cli\u003eRight-hand cut and right-hand flute configuration for conventional spindle use\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct substitute for 0.25 inch cobalt square end mills with a 0.375 inch shank in standard collet chucks and milling toolholders.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by machinists using a collet chuck or end mill holder sized to the 0.375 inch shank. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Verify runout with a dial indicator after seating and before cutting. Follow the machine tool manufacturer guidelines for clamping torque on collet nuts.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\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: 2.4375 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\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\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\u003eCoating\u003c\/strong\u003e: Uncoated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.06 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: E2039016\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51728483287346,"sku":"E2039016","price":29.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/81fef69d73f86d6e6e74eeef97968665.jpg?v=1788691919","url":"https:\/\/voomisupply.com\/products\/hertel-e2039016-square-end-mill-0-25-in-4-flute-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}