{"product_id":"hertel-84213529-roughing-end-mill-3-4-in-4-flute-cobalt","title":"Hertel 84213529 Roughing End Mill 3\/4 in 4 Flute Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 84213529 is a single-end roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel with a bright, uncoated finish, it offers the heat resistance and edge retention needed for tough ferrous and non-ferrous materials. The cutter measures 3\/4 inches in diameter with a 3\/4-inch length of cut and a 2-7\/8-inch overall length. Four right-hand flutes with a fine pitch geometry break up chips efficiently, reducing cutting forces and minimizing chatter during heavy roughing passes. This tool is centercutting, allowing plunge entry without a pre-drilled pilot hole.\u003c\/p\u003e\u003cp\u003eThis roughing end mill is suited for manual mills and CNC machining centers in job shop, maintenance, and production environments. It is a standard choice for roughing passes on steel, stainless, and other materials where cobalt tooling is specified. The 3\/4-inch shank diameter fits directly into standard end mill holders, collet chucks, and Weldon-style side-lock holders of the same bore size. Machinists and toolroom technicians working on ferrous stock will find the M42 grade appropriate for interrupted cuts and harder alloys.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eM42 cobalt HSS construction for elevated heat resistance and longer tool life in tough materials\u003c\/li\u003e\n\u003cli\u003eFour right-hand flutes with fine pitch for efficient chip evacuation during roughing passes\u003c\/li\u003e\n\u003cli\u003eCentercutting design allows direct plunge milling without a starter hole\u003c\/li\u003e\n\u003cli\u003eBright, uncoated finish suitable for use with or without cutting fluid\u003c\/li\u003e\n\u003cli\u003eRight-hand cutting and right-hand flute direction for standard spindle operation\u003c\/li\u003e\n\u003cli\u003eSingle-end configuration with 3\/4-inch shank matching cutter diameter for balanced rigidity\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a direct-fit replacement for standard 3\/4-inch single-end roughing end mills in any holder accepting a 3\/4-inch shank diameter, including ER collet chucks, shell mill adapters with the appropriate bore, and Weldon side-lock holders.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by a machinist or toolroom technician. Power down and lock out the spindle before changing tooling. Seat the shank fully into the holder to the recommended engagement depth before tightening; insufficient engagement reduces rigidity and can cause pullout under load. Inspect the shank and holder bore for chips or damage before each installation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 3\/4 inches (0.7500 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 HSS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: M42\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePitch\u003c\/strong\u003e: Fine\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\u003eShank Diameter\u003c\/strong\u003e: 3\/4 inches (0.7500 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-7\/8 inches (2.8750 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnd Type\u003c\/strong\u003e: Single End\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\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\u003eExtended Reach\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVariable Helix\u003c\/strong\u003e: No\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: 84213529\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51730425839922,"sku":"84213529","price":81.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/52b0696f9dbfad9a7d8308618e5fbbc5.jpg?v=1788717240","url":"https:\/\/voomisupply.com\/products\/hertel-84213529-roughing-end-mill-3-4-in-4-flute-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}