{"product_id":"helical-solutions-81639-square-end-mill-3-16-in-4-flute-carbide","title":"Helical Solutions 81639 Square End Mill 3\/16 in 4 Flute Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe HELICAL SOLUTIONS 81639 is a solid carbide square end mill designed for high-performance metal removal in steel and other ferrous materials. Built with four helical flutes and a variable-pitch index design, it reduces harmonic vibration during cutting, supporting smoother surface finishes and longer tool life. The cutting edge measures 3\/16 inch in diameter with a 7\/16 inch length of cut. An Aplus coating improves wear resistance and heat management at elevated cutting speeds. This end mill suits CNC machining centers and manual mills where precise, consistent milling of steel is required. It is typically installed and operated by machinists and tool-and-die professionals in job shop and production environments.\u003c\/p\u003e\n\u003cp\u003eThis end mill is engineered for milling steel alloys and is part of Helical Solutions' End Mills for Steels - 4 Flute - Square - Variable Pitch series. It performs in typical applications including slotting, profiling, and peripheral milling on ferrous workpieces. The straight-cylindrical shank fits standard ER collets and end mill holders with a 3\/16 inch bore. The centercutting capability allows plunge entry, adding flexibility in multi-axis or ramping toolpaths. The 2 inch overall length provides adequate reach for most shallow-to-medium depth features without sacrificing rigidity.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eVariable-pitch flute index reduces chatter and harmonic vibration during steel milling\u003c\/li\u003e\n  \u003cli\u003eAplus coating provides improved wear resistance and thermal protection at high surface speeds\u003c\/li\u003e\n  \u003cli\u003eCentercutting design allows direct plunge or ramp entry into the workpiece\u003c\/li\u003e\n  \u003cli\u003eRight-hand cut and right-hand helical flutes for conventional CNC spindle operation\u003c\/li\u003e\n  \u003cli\u003eSolid carbide construction delivers rigidity and edge retention superior to HSS alternatives\u003c\/li\u003e\n  \u003cli\u003eStraight-cylindrical shank compatible with standard collet chucks and end mill holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement and direct-fit tooling option for CNC machining centers and manual milling machines accepting a 3\/16 inch straight-cylindrical shank in standard ER collets or end mill holders. Part of the Helical Solutions End Mills for Steels - 4 Flute - Square - Variable Pitch series.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by a qualified machinist or tooling technician. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the shank fully into the collet or tool holder and torque the retention nut according to the holder manufacturer's specifications. Confirm runout with a dial indicator before beginning production cuts, as excessive runout will accelerate edge wear on carbide tooling.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 3\/16 inch (0.1875 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 7\/16 inch (0.4375 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 3\/16 inch (0.1875 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Mill Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Aplus\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Helical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\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\u003eVariable Index\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: End Mills for Steels - 4 Flute - Square - Variable Pitch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.026 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: HELICAL SOLUTIONS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 81639\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HELICAL SOLUTIONS","offers":[{"title":"Default Title","offer_id":51744971751730,"sku":"81639","price":46.21,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/20d7309ae11a5a70abe83eb1012b67a2_bea67af3-91e5-40c9-8dca-ee01b6eb531c.jpg?v=1788862822","url":"https:\/\/voomisupply.com\/products\/helical-solutions-81639-square-end-mill-3-16-in-4-flute-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}