{"product_id":"osg-5403100-square-end-mill-3-4-in-4-flute-cobalt","title":"Osg 5403100 Square End Mill 3\/4 in 4 Flute Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 5403100 is a square end mill designed for general-purpose milling operations in metal fabrication and machining environments. Built from M42 cobalt high-speed steel, it delivers strong heat and wear resistance when cutting ferrous and non-ferrous materials. The tool features a 0.75 inch mill diameter, a 1.625 inch length of cut, and a 3.875 inch overall length. With four spiral flutes and a 30-degree helix angle, it produces efficient chip evacuation and smooth cutting action. Licensed machinists and tool-and-die technicians are the primary installers and operators of this end mill.\u003c\/p\u003e\u003cp\u003eThis end mill is suited for side milling, slotting, and profiling operations on machining centers and manual vertical mills. The regular length classification makes it appropriate for standard-depth cuts in steel, stainless, cast iron, and similar materials. The 0.75 inch shank diameter fits standard R8, CAT, BT, and HSK toolholders with a matching bore. It belongs to OSG Series 540, a cobalt end mill line intended for general production machining where carbide tooling is not required or cost-justified.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eM42 cobalt construction for elevated heat resistance compared to standard HSS\u003c\/li\u003e\n\u003cli\u003e30-degree helix angle with spiral flutes for efficient chip removal\u003c\/li\u003e\n\u003cli\u003eFour flutes for a balance of chip clearance and surface finish\u003c\/li\u003e\n\u003cli\u003eRight-hand cut and right-hand flute configuration for standard spindle operation\u003c\/li\u003e\n\u003cli\u003eUncoated finish — suitable for re-sharpening and general-purpose applications\u003c\/li\u003e\n\u003cli\u003eNon-centercutting geometry — not intended for direct plunge entry\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose replacement or production end mill for use with 0.75 inch bore toolholders on vertical machining centers and manual knee mills; belongs to OSG Series 540.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Use a properly sized collet or end mill holder matching the 0.75 inch shank diameter and torque to the toolholder manufacturer's specification. This tool is non-centercutting and must be ramped or helically interpolated into the workpiece rather than plunged directly.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 0.75 inches (3\/4 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 1.625 inches (1-5\/8 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.75 inches (3\/4 inch)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.875 inches (3-7\/8 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\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\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\u003eSeries\u003c\/strong\u003e: 540\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: OSG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 5403100\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51729650745650,"sku":"5403100","price":88.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/be9fbf6ab5d12fa267a8be5fef8a58cf.jpg?v=1788707204","url":"https:\/\/voomisupply.com\/products\/osg-5403100-square-end-mill-3-4-in-4-flute-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}