{"product_id":"hertel-e2051056-square-end-mill-7-8-in-4-flute-cobalt","title":"Hertel E2051056 Square End Mill 7\/8 in 4 Flute Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL E2051056 is a double-end cobalt square end mill designed for metal cutting in milling machines and machining centers. Built from M42 cobalt high-speed steel, it handles tough ferrous alloys and hardened steels that standard HSS tooling cannot manage. The 7\/8 inch diameter cutter carries four flutes with a 30-degree helix angle, producing a clean, spiral chip evacuation path. At 6.125 inches overall length with a 1.875 inch length of cut, this tool suits standard bridgeport-style knee mills and CNC verticals. The bright, uncoated finish is typical for cobalt tooling intended for regrinding or use where coating adhesion is not required. Machinists, tool-and-die makers, and maintenance technicians are the primary users of this class of end mill.\u003c\/p\u003e\u003cp\u003eThis end mill is suited for peripheral and slot milling operations in steel, stainless steel, cast iron, and similar ferrous workpiece materials. The double-end configuration provides two cutting ends per tool, extending usable tool life before regrind or replacement. Right-hand cutting and right-hand flute direction are standard for conventional milling setups. The regular length classification makes it a practical choice for general-purpose milling where extended reach is not required and rigidity is preferred. It is not center-cutting, so it is not suited for direct plunge operations without a pre-drilled pilot hole.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eM42 cobalt high-speed steel construction for elevated heat and wear resistance\u003c\/li\u003e\n\u003cli\u003eDouble-end design delivers two usable cutting ends per tool\u003c\/li\u003e\n\u003cli\u003e30-degree helix angle promotes efficient chip evacuation in ferrous materials\u003c\/li\u003e\n\u003cli\u003e4 flutes provide a balance of chip clearance and surface finish\u003c\/li\u003e\n\u003cli\u003e7\/8 inch shank diameter matches standard collets and end mill holders\u003c\/li\u003e\n\u003cli\u003eBright\/uncoated finish suitable for regrinding programs\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement for cobalt square end mills with a 7\/8 inch diameter, 7\/8 inch shank, and 1-7\/8 inch length of cut in standard milling applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by machinists using a compatible collet chuck or end mill holder rated for the 7\/8 inch shank diameter. Ensure the spindle is fully de-energized and locked out before tool changes. Verify holder runout with a dial indicator before cutting to protect both the tool and the workpiece. Because this tool is not center-cutting, always pre-drill or ramp into the workpiece when plunge entry is required.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 7\/8 inches (0.8750 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 1-7\/8 inches (1.875 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 6-1\/8 inches (6.125 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 7\/8 inches (0.875 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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: 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\u003eEnd Type\u003c\/strong\u003e: Double End\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentercutting\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Bright\/Uncoated\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\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: E2051056\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51751941603634,"sku":"E2051056","price":149.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a6480932ae0654a30fb3baf31e41066c.jpg?v=1788924791","url":"https:\/\/voomisupply.com\/products\/hertel-e2051056-square-end-mill-7-8-in-4-flute-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}