{"product_id":"carmex-s0250c2540un-thread-mill-4-40-unc-3-flute-solid-carbide","title":"Carmex S0250C2540UN Thread Mill 4-40 Unc 3 Flute Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CARMEX S0250C2540UN is a mini helical flute thread mill designed for cutting internal 4-40 UNC threads in a single helical interpolation pass. Built from solid carbide with a TiAlN coating, it delivers the hardness and heat resistance needed for productive threading in steel, cast iron, stainless, and non-ferrous alloys. The tool carries a 0.0830 inch cutting diameter, a 1\/4 inch (0.2500 inch) shank diameter, and 3 flutes. It is intended for use in CNC machining centers where the spindle and control support helical interpolation. Machinists and tool-and-die professionals working in precision threading applications are the primary users of this tool.\u003c\/p\u003e\n\u003cp\u003eThis thread mill is suited for small-diameter internal thread production where tapping presents breakage risk or where a single tool must produce threads in a range of hole sizes. The 4-40 UNC designation targets fine-pitch fastener holes common in electronics enclosures, instrument housings, and light mechanical assemblies. The mini thread mill format keeps the tool compact for shallow-feature work. The 1\/4 inch length of cut and 2-1\/2 inch overall length allow reach into standard workpiece features without excessive overhang. Coolant-through capability is not present, so flood or mist cooling at the spindle is the typical approach.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction rated to material grade MT7 for rigidity and wear resistance\u003c\/li\u003e\n  \u003cli\u003eTiAlN coating improves heat resistance and extends tool life in ferrous and hardened materials\u003c\/li\u003e\n  \u003cli\u003e3-flute helical geometry produces internal 4-40 UNC threads in a single CNC interpolation pass\u003c\/li\u003e\n  \u003cli\u003e0.0830 inch cutting diameter with 40 teeth per inch matches 4-40 thread form precisely\u003c\/li\u003e\n  \u003cli\u003e1\/4 inch shank diameter fits standard collet and end-mill holders on most CNC machining centers\u003c\/li\u003e\n  \u003cli\u003eMini thread mill classification suits tight-tolerance small-hole threading where tap breakage is a concern\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style threading solution for CNC machining centers capable of helical interpolation, this tool is compatible with standard 1\/4 inch collet chucks and end-mill holders. No specific machine model compatibility data was provided by the manufacturer for this SKU.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation and operation of this tool should be performed by a qualified CNC machinist or tooling professional. Secure the 1\/4 inch shank in a properly sized collet or end-mill holder and verify runout before cutting. Confirm that the machining center control supports helical interpolation and that the programmed thread mill cycle matches the 4-40 UNC thread form. Because coolant-through is not available on this tool, direct flood or mist cooling at the cutting zone is recommended to manage chip evacuation and heat in the cut.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 4-40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UNC\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type\u003c\/strong\u003e: Internal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTeeth Per Inch\u003c\/strong\u003e: 40 TPI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Diameter\u003c\/strong\u003e: 0.0830 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.2500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.2500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 2.2500 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.5000 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: MT7\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiAlN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Mill Type\u003c\/strong\u003e: Mini\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.05 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23242117\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: CARMEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: S0250C2540UN\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CARMEX","offers":[{"title":"Default Title","offer_id":52077491814706,"sku":"S0250C2540UN","price":267.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/d5018f90b77ada3c756ef7bdc117139e_78573658-af09-45f8-a2ea-835e38714596.jpg?v=1790053414","url":"https:\/\/voomisupply.com\/products\/carmex-s0250c2540un-thread-mill-4-40-unc-3-flute-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}