{"product_id":"robbjack-nr-404-08-square-end-mill-1-4-in-4-flute-solid-carbide","title":"Robbjack NR-404-08 Square End Mill 1\/4 in 4 Flute Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ROBBJACK NR-404-08 is a solid carbide square end mill designed for precision milling in metalworking and machining applications. Built to Series NR-404 standards, it features a 0.25 inch cutting diameter, a 0.75 inch length of cut, and a 2.5 inch overall length. The four-flute, right-hand spiral configuration promotes efficient chip evacuation and a smooth cutting action. Carbide grade C2 construction provides the hardness and wear resistance needed for consistent performance in ferrous and non-ferrous materials. Centercutting geometry allows the tool to plunge directly into the workpiece, expanding its range of use in slotting, profiling, and pocket milling operations.\u003c\/p\u003e\u003cp\u003eThis end mill is suited for use on CNC machining centers and manual mills in production and job-shop environments. The regular length profile and straight cylindrical shank make it a straightforward fit in standard collet chucks and end mill holders with a 0.25 inch bore. Uncoated carbide at grade C2 is a common choice when machining aluminum, brass, and mild steels where coating buildup or heat sensitivity is a concern. The 30-degree helix angle balances cutting efficiency with edge stability across a range of cutting depths and feed rates.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSolid carbide C2 grade construction for hardness and wear resistance\u003c\/li\u003e\n\u003cli\u003eFour right-hand spiral flutes with centercutting capability for plunge entry\u003c\/li\u003e\n\u003cli\u003e0.25 inch cutting diameter with a mill diameter tolerance of +0.001 \/ -0.000 inches\u003c\/li\u003e\n\u003cli\u003e0.75 inch length of cut suits standard slotting and profiling depths\u003c\/li\u003e\n\u003cli\u003e30-degree helix angle balances chip flow and edge stability\u003c\/li\u003e\n\u003cli\u003eStraight cylindrical shank with tight tolerance of -0.0001 \/ -0.0002 inches for secure tool holding\u003c\/li\u003e\n\u003cli\u003eUncoated finish appropriate for non-ferrous and mild ferrous materials\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement and standard cutting tool for use in 0.25 inch bore collet chucks, ER collet systems, and end mill holders on CNC machining centers and conventional milling machines.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or CNC setup technician. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Seat the shank fully into the holder and torque the collet nut or set screw to the tool holder manufacturer specifications. Verify runout with a dial indicator before beginning a cut to protect both the tool and the workpiece.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5 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: 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: Regular\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMill Diameter Tolerance\u003c\/strong\u003e: +0.001 \/ -0.000 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: NR-404\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.125 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: NR-404-08\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ROBBJACK","offers":[{"title":"Default Title","offer_id":51966763073842,"sku":"NR-404-08","price":87.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a913e66a6f6169f1917b63fcf4a43218_41728b7f-ad57-4e26-a9b1-4ada18fdb2ba.jpg?v=1789950579","url":"https:\/\/voomisupply.com\/products\/robbjack-nr-404-08-square-end-mill-1-4-in-4-flute-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}