{"product_id":"robbjack-st-646-16-a-corner-radius-end-mill-1-2-in-6-flute","title":"Robbjack ST-646-16-A Corner Radius End Mill 1\/2 in 6 Flute","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ROBBJACK ST-646-16-A is a single-end, corner radius end mill engineered for high-performance milling in demanding materials. Built from solid carbide and coated with AlTiN via a PVD process, it delivers extended tool life in dry or semi-dry cutting conditions. The 1\/2-inch diameter cutter features 6 flutes with a variable helix and variable index geometry, reducing harmonic chatter and improving surface finish. A corner radius range of 0.0060 to 0.0090 inches protects the cutting edge from chipping at depth. This tool is installed and run by machinists and CNC operators in job shop, production, and toolroom environments.\u003c\/p\u003e\n\u003cp\u003eThe ST-646-16-A is suited for milling steel, stainless steel, cast iron, superalloys, and titanium. With a 1-inch length of cut (0.875 inches decimal), a 1\/2-inch straight-cylindrical shank, and a 3-inch overall length, it fits standard toolholders used on vertical and horizontal machining centers. The close pitch flute configuration and right-hand cutting direction make it a practical choice for side milling, slotting, and finishing passes in tough alloys.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction for rigidity and wear resistance in hard and abrasive workpiece materials\u003c\/li\u003e\n  \u003cli\u003eAlTiN PVD coating extends tool life and supports elevated cutting temperatures in ferrous and exotic alloys\u003c\/li\u003e\n  \u003cli\u003eVariable helix and variable index design reduces vibration and chatter during aggressive cuts\u003c\/li\u003e\n  \u003cli\u003eCorner radius of 0.0060 to 0.0090 inches reduces edge chipping and improves corner strength\u003c\/li\u003e\n  \u003cli\u003eCentercutting capability allows plunge entry without a pre-drilled pilot hole\u003c\/li\u003e\n  \u003cli\u003e6-flute, close-pitch configuration supports higher feed rates in finishing and semi-finishing operations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with standard straight-bore toolholders accepting a 1\/2-inch cylindrical shank. Primary workpiece materials include steel, stainless steel, cast iron, superalloys, and titanium (material codes P, M, K, S). Part of the ROBBJACK ST-646 series.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstall in a compatible toolholder and torque set screws or collet nuts to the toolholder manufacturer's specification before use. Confirm shank is fully seated and free of chips or burrs prior to clamping. This tool does not support coolant-through delivery; use external coolant or appropriate cutting fluid directed at the cutting zone. Follow your machine tool manufacturer's recommended runout tolerance and RPM limits for solid carbide end mills of this diameter.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 1\/2 inch (0.5000 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.875 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 1\/2 inch (0.5000 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCorner Radius\u003c\/strong\u003e: 0.0060 to 0.0090 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHelix Style\u003c\/strong\u003e: High, Variable\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Type\u003c\/strong\u003e: Corner Radius\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePitch\u003c\/strong\u003e: Close\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: AlTiN (PVD)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Mill Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCentercutting\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChipbreaker\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVariable Index\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSingle or Double End\u003c\/strong\u003e: Single\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMill Diameter Tolerance\u003c\/strong\u003e: 0.0010 to 0.0020 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: 0.0001 to 0.0002 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length Tolerance\u003c\/strong\u003e: -0.0600 to 0.0600 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Materials\u003c\/strong\u003e: Steel, Stainless Steel, Cast Iron, Superalloys and Titanium\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: ST-646\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1875 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: ROBBJACK\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: ST-646-16-A\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ROBBJACK","offers":[{"title":"Default Title","offer_id":52022856089906,"sku":"ST-646-16-A","price":234.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/2cb6916703a1ed44a9dca967b8105aa9_30a84fe5-e428-4d38-b231-02e91034a19a.jpg?v=1790013584","url":"https:\/\/voomisupply.com\/products\/robbjack-st-646-16-a-corner-radius-end-mill-1-2-in-6-flute","provider":"Voomi Supply","version":"1.0","type":"link"}