{"product_id":"hertel-e299921163-square-end-mill-21-64-in-4-flute-cobalt","title":"Hertel E299921163 Square End Mill 21\/64 in 4 Flute Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL E299921163 is a single-end, square-profile cobalt end mill designed for milling operations in ferrous and tough alloy materials. Built from M42 cobalt high-speed steel, it delivers heat and wear resistance that standard HSS tooling cannot match. The cutter measures 21\/64 inches (0.3281 inches) in diameter with a 3\/4 inch length of cut and a 30-degree right-hand spiral helix. It runs four flutes in a right-hand cutting direction, producing efficient chip evacuation on profile milling, slotting, and peripheral cuts. This tool ships in a bright, uncoated finish. It is installed and used by machinists and tool-and-die professionals on manual mills and CNC machining centers.\u003c\/p\u003e\n\u003cp\u003eThis end mill is suited for shops working with alloy steels, stainless steels, and other materials that generate significant cutting heat. The 3\/8 inch shank diameter fits standard collet chucks and end mill holders common to both knee mills and CNC vertical machining centers. With a 2-1\/2 inch overall length and no extended-reach geometry, it is a compact, rigid setup appropriate for general-purpose cavity work, step milling, and contour passes in a production or toolroom environment.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eM42 cobalt HSS construction for elevated heat resistance and tool life in tough alloys\u003c\/li\u003e\n  \u003cli\u003e4-flute, right-hand spiral configuration for efficient chip removal and surface finish\u003c\/li\u003e\n  \u003cli\u003e30-degree helix angle balances cutting force and chip flow across a range of feed rates\u003c\/li\u003e\n  \u003cli\u003eCenter-cutting geometry allows direct plunge entry without a pre-drilled pilot hole\u003c\/li\u003e\n  \u003cli\u003eBright\/uncoated finish for compatibility with a wide range of cutting fluids and materials\u003c\/li\u003e\n  \u003cli\u003eSingle-end design with 3\/8 inch shank for rigid clamping in standard toolholders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or standard toolroom end mill fitting any machine spindle that accepts a 3\/8 inch shank via collet, set-screw holder, or shrink-fit toolholder.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists following standard toolroom practice. Ensure the machine spindle is fully stopped and locked before inserting or removing the cutter from the toolholder. Verify runout with a dial indicator after clamping and before cutting. Follow your machine tool manufacturer and shop safety guidelines for speeds, feeds, and coolant application when working with cobalt HSS tooling.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 21\/64 inches (0.3281 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 3\/4 inches (0.7500 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-1\/2 inches (2.5000 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 3\/8 inches (0.3750 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 HSS)\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\u003eCenter Cutting\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Style\u003c\/strong\u003e: Single End, Square\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExtended Reach\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.5 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: E299921163\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51752987722034,"sku":"E299921163","price":38.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/e682a4aa06f906a1836ddae3fd82953d_4ffa54e9-d674-4aa9-834a-706d85788e9f.jpg?v=1788931887","url":"https:\/\/voomisupply.com\/products\/hertel-e299921163-square-end-mill-21-64-in-4-flute-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}