{"product_id":"osg-5403205-square-end-mill-7-8-in-4-flute-cobalt-tin","title":"Osg 5403205 Square End Mill 7\/8 in 4 Flute Cobalt Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 5403205 is a 4-flute cobalt square end mill designed for milling ferrous and hard materials in machining centers and manual mills. Built from M42 cobalt high-speed steel, it carries a TiN (titanium nitride) coating that extends tool life and reduces friction during cutting. The mill diameter is 0.875 inches (7\/8 inch), with a 1.875-inch (1-7\/8 inch) length of cut and a 0.750-inch (3\/4 inch) shank diameter. Overall length is 4.125 inches (4-1\/8 inch). The 30-degree spiral helix and right-hand cut geometry promote efficient chip evacuation and stable cutting action across a range of feed rates and depths.\u003c\/p\u003e\u003cp\u003eThis end mill is suited for peripheral and slot milling operations on steel, stainless steel, and other ferrous alloys in both production shop and job shop environments. The regular-length body and standard shank diameter make it a common choice for side milling, profiling, and pocketing operations. It is a single-end, non-center-cutting tool, so plunge cuts are not recommended. Machinists and CNC operators working on general-purpose milling fixtures, dies, and machine components will find this a practical tooling choice.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eM42 cobalt HSS construction for elevated heat and wear resistance compared to standard M2 HSS\u003c\/li\u003e\n\u003cli\u003eTiN finish reduces friction and extends tool life on ferrous materials\u003c\/li\u003e\n\u003cli\u003e4-flute design balances chip clearance with surface finish quality\u003c\/li\u003e\n\u003cli\u003e30-degree right-hand spiral flute promotes smooth chip flow and reduced cutting forces\u003c\/li\u003e\n\u003cli\u003eNon-center-cutting geometry — suited for peripheral, slot, and side milling, not plunge entry\u003c\/li\u003e\n\u003cli\u003eOSG Series 540 regular-length design for stable overhang and general-purpose fitment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003ePart of the OSG Series 540 regular-length end mill line. Designed for use in standard R8, CAT, BT, or equivalent toolholders accepting a 3\/4-inch shank diameter. Verify toolholder runout and collet condition before use.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and tool changes should be performed by a qualified machinist with the machine powered down and the spindle fully stopped. Ensure the shank is clean and the toolholder collet or set screw is torqued to the toolholder manufacturer specification. This is a non-center-cutting end mill — do not use for direct plunge operations; use a drill or center-cutting end mill to establish an entry point first. Follow shop safety protocols and applicable OSHA machining guidelines when operating milling equipment.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 7\/8 inch (0.875 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 1-7\/8 inches (1.875 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 3\/4 inch (0.750 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 4-1\/8 inches (4.125 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\u003eCoating\u003c\/strong\u003e: TiN (Titanium Nitride)\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\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: 5403205\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51730558550322,"sku":"5403205","price":159.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3ed317610ef8631a1070b2202dfe40c5.jpg?v=1788719581","url":"https:\/\/voomisupply.com\/products\/osg-5403205-square-end-mill-7-8-in-4-flute-cobalt-tin","provider":"Voomi Supply","version":"1.0","type":"link"}