Carmex 21-14NPTMT7 Carbide Thread Mill Insert 14 Tpi

Product Description

The CARMEX 21-14NPTMT7 is a submicron carbide thread mill insert designed for cutting NPT-standard threads at 14 teeth per inch (TPI). Coated with TiAlN for heat resistance and extended tool life, this insert handles both internal and external threading operations in a single tool setup. The conical profile conforms to ANSI B1.20.1-1983, the governing standard for tapered pipe threads. At 0.185 inches thick, the insert seats securely in compatible thread mill bodies. It is installed by machinists and CNC operators working in production or maintenance environments where NPT fittings are routinely required.

This insert is suited for shops producing or reworking NPT threaded connections in pipe fittings, hydraulic components, and fluid-handling assemblies. The 21 insert style and size code match a specific range of thread mill bodies designed for that geometry. The TiAlN coating makes it a practical choice for dry or semi-dry cutting in steel, stainless, and other ferrous materials where heat generation is a factor. Both residential and commercial trade applications that require code-compliant tapered pipe thread profiles benefit from this insert.

Key Features

• Submicron carbide substrate for increased edge toughness and wear resistance
• TiAlN coating provides high-temperature resistance for extended cutting life
• Cuts both internal and external NPT threads - 14 TPI
• Conical geometry conforms to ANSI B1.20.1-1983 tapered pipe thread standard
• Insert Style 21IE with size code 21 for use in compatible thread mill bodies
• Certified to CE, ISO 9001:2015, ISO 13485:2016, ISO 14001:2015, and ISO 45001

Compatibility

Designed for use with thread mill bodies that accept the 21 insert style and size code. Suited for NPT thread milling applications conforming to ANSI B1.20.1-1983.

Installation Notes

Installation is performed by a qualified machinist or CNC operator. Ensure the thread mill body is clean and free of debris before seating the insert. Verify correct torque per the tool body manufacturer specification before starting a cut. Follow established CNC programming practices for helical interpolation when milling tapered pipe threads.