{"product_id":"carmex-b0250c0420un-thread-mill-1-4-20-internal-3-flute-carbide","title":"Carmex B0250C0420UN Thread Mill 1\/4-20 Internal 3 Flute Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CARMEX B0250C0420UN is a helical flute thread mill designed for cutting internal 1\/4-20 UNC threads in a CNC machining environment. The tool is manufactured from solid carbide in material grade MT7 and carries a TiAlN coating for heat resistance and extended tool life at elevated cutting speeds. With 3 right-hand flutes and a cutting diameter of 0.185 inches, it produces clean thread forms in a single helical interpolation pass. Coolant-through capability supports chip evacuation in blind holes and deep-thread applications. The 1\/4-inch shank diameter fits standard collet and end mill holders.\u003c\/p\u003e\n\u003cp\u003eThis thread mill is suited for job shops, production machining cells, and toolroom operations where CNC milling centers handle threaded-hole features. The 1\/4-20 UNC thread form is common in general mechanical assembly, fixturing, and light structural applications. At 2.5 inches overall length with a 0.48-inch length of cut and a 2.02-inch shank length, the tool reaches threads in moderately deep bores without excessive overhang. It is installed by machinists and CNC programmers running helical interpolation cycles on 3-axis or 5-axis machining centers.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide MT7 grade construction for rigidity and wear resistance in ferrous and non-ferrous materials\u003c\/li\u003e\n  \u003cli\u003eTiAlN coating provides thermal barrier and extends tool life at high cutting speeds\u003c\/li\u003e\n  \u003cli\u003e3 right-hand helical flutes for smooth cutting action and efficient chip flow\u003c\/li\u003e\n  \u003cli\u003eCoolant-through design supports chip evacuation in blind holes and high-feed operations\u003c\/li\u003e\n  \u003cli\u003eCuts 1\/4-20 UNC internal threads in a single helical interpolation pass, reducing cycle time versus tapping\u003c\/li\u003e\n  \u003cli\u003e1\/4-inch shank diameter fits standard ER collets and side-lock end mill holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use on CNC machining centers capable of helical interpolation, producing 1\/4-20 UNC internal threads. Compatible with standard 1\/4-inch collet chucks and end mill holders.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis tool is installed and operated by machinists and CNC programmers. Confirm the machining center spindle and control support helical interpolation before use. Secure the shank fully in a balanced collet or shrink-fit holder and verify runout before cutting. Follow the tooling manufacturer and machine builder guidelines for feed rate, spindle speed, and coolant pressure when programming the helical interpolation cycle.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Size\u003c\/strong\u003e: 1\/4-20\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: 20 TPI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Diameter\u003c\/strong\u003e: 0.185 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength of Cut\u003c\/strong\u003e: 0.48 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\u003eShank Diameter\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 2.02 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Direction\u003c\/strong\u003e: Right Hand\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\u003c\/strong\u003e: TiAlN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.04 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: CARMEX\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: B0250C0420UN\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CARMEX","offers":[{"title":"Default Title","offer_id":51995644920114,"sku":"B0250C0420UN","price":326.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/abd34eb835b3548f9636255bc6ed4c17.jpg?v=1789992831","url":"https:\/\/voomisupply.com\/products\/carmex-b0250c0420un-thread-mill-1-4-20-internal-3-flute-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}