The Carmex Carbide Threading Insert - UNJ - TiAlN Coated (21I16UNJ) is a versatile threading solution designed for machinists who work with a wide range of thread profiles. Built to perform in both internal and external threading tasks, it delivers dependable, precision results across multiple applications.

• Thread profile coverage: A versatile collection of inserts that covers all common thread profiles, reducing the need for multiple tools.
• Length options: Five lengths spanning from 12 mm up to 40 mm to match different depths and pitches.
• Pitch range: Capable of handling pitches from 0.5 mm / 32 TPI to 6.0 mm / 4 TPI.
• Double-sided cutting edges: Each insert has two cutting edges for extended wear life (note exceptions for BSPT/NPT/NPTF/American Buttress/API RD).
• Internal/external capability: For many thread profiles, the same insert can machine both internal and external threads (exceptions for ISO/UN/NPSM/UNJ/Acme).
• Coating: TiAlN coating enhances wear resistance and heat tolerance for longer insert life in demanding materials.
• Material: Carbide substrate delivers rigidity, precision, and reliable performance in threading operations.

With this insert, you gain a streamlined, economical tool that supports a broad range of thread forms without swapping to multiple inserts. The double-edged design minimizes downtime by enabling reuse across cuts, while the TiAlN coating helps maintain a sharp edge in higher-temperature work. Ideal for job shops and production environments, it simplifies tooling inventories, speeds setup, and delivers consistent thread quality across UNJ and other common profiles.