{"product_id":"carmex-21i20unmt7-carbide-thread-mill-insert-un-20-tpi","title":"Carmex 21I20UNMT7 Carbide Thread Mill Insert Un 20 Tpi","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe CARMEX 21I20UNMT7 is a carbide thread mill insert engineered for internal UN threading applications. Manufactured from submicron carbide in the MT7 grade, this insert carries a TiAlN (Titanium Aluminum Nitride) coating that improves wear resistance and extends tool life under demanding cutting conditions. With a thread pitch of 20 teeth per inch (TPI) and a thickness of 0.185 inches (4.7 mm), it provides consistent thread form on internal UN profiles. The insert follows insert style 21I and conforms to ANSI B1.1-1989 standards. It is intended for use by machinists and CNC tooling professionals working in production and job-shop environments.\u003c\/p\u003e\u003cp\u003eThis insert is suited for internal UN thread milling operations in ferrous and non-ferrous materials where tight thread tolerances and surface finish quality are required. The TiAlN coating makes it a practical choice for dry or semi-dry cutting environments and for applications involving elevated cutting temperatures. It is designed for use in thread milling toolholders compatible with the 21I insert style, common in CNC machining centers. Typical applications include threading bores in precision components across aerospace, industrial, and general manufacturing sectors.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSubmicron carbide substrate in manufacturer grade MT7 for high hardness and edge integrity\u003c\/li\u003e\n\u003cli\u003eTiAlN coating for improved thermal resistance and extended tool life\u003c\/li\u003e\n\u003cli\u003eInternal UN thread configuration conforming to ANSI B1.1-1989\u003c\/li\u003e\n\u003cli\u003e20 TPI pitch for standard UN thread milling operations\u003c\/li\u003e\n\u003cli\u003eNon-conical insert geometry for straightforward thread milling setups\u003c\/li\u003e\n\u003cli\u003eCertified to CE, ISO 9001:2015, ISO 13485:2016, ISO 14001:2015, and ISO 45001 standards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct-fit insert for thread milling toolholders accepting the 21I insert style in internal UN threading configurations.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThread mill insert seating and clamping should be performed by a qualified machinist following the toolholder manufacturer's torque and seating specifications. Ensure the spindle is fully stopped and the machine is in a safe state before changing inserts. Inspect the insert pocket and clamping screw for wear or damage before installation. Follow applicable shop safety procedures and machine tool manufacturer guidelines when setting tool offsets and running thread milling cycles.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Style\u003c\/strong\u003e: 21I\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Size Code\u003c\/strong\u003e: 21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsert Material\u003c\/strong\u003e: Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: Submicron\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer 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 Type\u003c\/strong\u003e: Internal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Standard\u003c\/strong\u003e: UN\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTeeth Per Inch\u003c\/strong\u003e: 20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.185 inches (4.7 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConical\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eANSI Code\u003c\/strong\u003e: ANSI B1.1-1989\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.5 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertifications\u003c\/strong\u003e: CE, ISO 9001:2015, ISO 13485:2016, ISO 14001:2015, ISO 45001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23291804\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: 21I20UNMT7\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CARMEX","offers":[{"title":"Default Title","offer_id":52069486592306,"sku":"21I20UNMT7","price":111.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/41f9f5fcb5472a9668d48ebf6b96c03c.jpg?v=1790047801","url":"https:\/\/voomisupply.com\/products\/carmex-21i20unmt7-carbide-thread-mill-insert-un-20-tpi","provider":"Voomi Supply","version":"1.0","type":"link"}