{"product_id":"hertel-81825168-square-end-mill-1-4-in-4-flute-cobalt","title":"Hertel 81825168 Square End Mill 1\/4 in 4 Flute Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HERTEL 81825168 is a 4-flute cobalt square end mill designed for milling ferrous and hard materials in machining applications. Built from M42 cobalt high-speed steel, it offers greater heat and wear resistance than standard M2 HSS tooling, making it well suited for stainless steel, hardened alloys, and tough aerospace-grade materials. The cutter measures 0.25 inches in diameter with a 1.25-inch length of cut and a 3\/8-inch shank diameter. A 30-degree right-hand spiral flute geometry promotes efficient chip evacuation and smooth cutting action. The uncoated finish and regular-length configuration make it a straightforward replacement or stocking tool for general CNC and manual milling setups.\u003c\/p\u003e\n\u003cp\u003eThis end mill fits conventional knee mills, CNC machining centers, and manual milling machines where a 3\/8-inch collet or end mill holder is in use. It is intended for slotting, profiling, and peripheral milling in shop environments that regularly machine difficult-to-cut materials. The right-hand cut and right-hand flute orientation match standard spindle rotation on most vertical milling machines. Machinists and tool-and-die professionals in job shops, production facilities, and maintenance departments will find this a practical option for everyday metal removal tasks.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eM42 cobalt HSS construction provides elevated heat resistance compared to standard HSS end mills\u003c\/li\u003e\n  \u003cli\u003e4-flute design increases feed rate capability and improves surface finish on ferrous materials\u003c\/li\u003e\n  \u003cli\u003e30-degree helix angle promotes effective chip flow during slotting and profiling cuts\u003c\/li\u003e\n  \u003cli\u003eRight-hand cut and right-hand flute orientation compatible with standard vertical milling spindles\u003c\/li\u003e\n  \u003cli\u003eUncoated finish allows easy regrinding and is suitable for use with cutting fluids\u003c\/li\u003e\n  \u003cli\u003eNon-centercutting geometry — not intended for plunge cuts directly into solid stock\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a standard-shank cobalt square end mill for use in 3\/8-inch collets, end mill holders, or Weldon-style holders on CNC machining centers and manual knee mills.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by a machinist or toolroom technician. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the 3\/8-inch shank fully in the holder and torque the set screw or collet nut to the tool holder specification. Confirm runout with a dial indicator before beginning a cut, as excessive runout will accelerate tool wear on cobalt tooling.\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 (1\/4 inch)\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\u003eLength of Cut\u003c\/strong\u003e: 1.25 inches (1-1\/4 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.375 inches (3\/8 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.125 inches (3-1\/8 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHelix Angle\u003c\/strong\u003e: 30 degrees\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: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVariable Helix\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChipbreaker\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: 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\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: 81825168\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51732584988978,"sku":"81825168","price":37.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d25b3fc33d6f73d3a553122190bc1f08.jpg?v=1788744680","url":"https:\/\/voomisupply.com\/products\/hertel-81825168-square-end-mill-1-4-in-4-flute-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}