{"product_id":"robbjack-s1-401-04-square-end-mill-1-8-inch-4-flute-carbide","title":"Robbjack S1-401-04 Square End Mill 1\/8 Inch 4 Flute Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe ROBBJACK S1-401-04 is a solid carbide square end mill designed for precision milling in metalworking and machining applications. With a 0.125-inch mill diameter, 4-flute geometry, and a 30-degree helix angle, this end mill delivers clean, accurate cuts in ferrous and non-ferrous materials. The stub-length configuration  -  0.25 inches length of cut and 1.5 inches overall length  -  provides added rigidity during cutting operations, reducing deflection in tight tolerances. This tool is part of the ROBBJACK S1-401 series and is manufactured from C2-grade solid carbide in an uncoated finish.\u003c\/p\u003e\n\u003cp\u003eThe S1-401-04 is suited for use in CNC machining centers and manual milling machines handling small-diameter work. Its centercutting capability allows plunge cuts as well as conventional peripheral milling. The right-hand cut and right-hand spiral flute direction are standard for most vertical and horizontal milling setups. Typical applications include slotting, profiling, and pocketing in precision part manufacturing. This tool is intended for use by machinists and toolroom technicians working in job shops, production facilities, and maintenance environments.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction, C2 material grade, for durability and heat resistance\u003c\/li\u003e\n  \u003cli\u003e4-flute, 30-degree right-hand spiral for smooth chip evacuation and surface finish\u003c\/li\u003e\n  \u003cli\u003eCentercutting design enables direct plunge entry without pilot drilling\u003c\/li\u003e\n  \u003cli\u003eStub-length configuration increases rigidity and reduces deflection in tight-tolerance cuts\u003c\/li\u003e\n  \u003cli\u003eStraight cylindrical shank for standard collet and end mill holder compatibility\u003c\/li\u003e\n  \u003cli\u003eUncoated finish suitable for use with cutting fluids on a range of workpiece materials\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style tooling option for use with standard 1\/8-inch collets, end mill holders, and tool chucks on CNC machining centers and manual knee mills accepting straight cylindrical shanks.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified machinist following established tooling procedures. Ensure the spindle is fully stopped and the machine is locked out before mounting or removing tooling. Seat the shank fully in the collet or holder and torque the retention nut to the tool holder manufacturer's specification. Verify runout with a dial indicator before beginning a cut, particularly when working to close tolerances at 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: 0.125 inches (1\/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\u003eLength of Cut\u003c\/strong\u003e: 0.25 inches (1\/4 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 1.5 inches (1-1\/2 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.125 inches (1\/8 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Mill Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: C2\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\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\u003eLength Type\u003c\/strong\u003e: Stub\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMill Diameter Tolerance\u003c\/strong\u003e: +0.000 \/ -0.002 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: -0.0001 \/ -0.0002 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length Tolerance\u003c\/strong\u003e: +0.060 \/ -0.060 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: S1-401\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.0625 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: S1-401-04\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ROBBJACK","offers":[{"title":"Default Title","offer_id":51957870788914,"sku":"S1-401-04","price":40.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/4d22095d586bd2b66ff0398e38ab03ef.jpg?v=1789944736","url":"https:\/\/voomisupply.com\/products\/robbjack-s1-401-04-square-end-mill-1-8-inch-4-flute-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}