The Carmex Carbide Threading Insert - UNJ - TiAlN Coated - 21I18UNJ is a versatile, high-precision threading solution built for machinists who work with UNJ and other common thread profiles. Crafted from carbide and finished with a TiAlN coating, it delivers reliable performance across challenging cutting conditions.

• Material: Carbide insert for exceptional rigidity, wear resistance, and long edge life during high-speed threading.
• Coating: TiAlN coating enhances hardness and heat resistance, helping maintain sharpness and extend tool life.
• Length options: Five lengths available, ranging from 12 mm to 40 mm, to suit different thread profiles and pitch requirements.
• Pitch range: Depending on length, capable of handling pitches from 0.5 mm / 32 TPI up to 6.0 mm / 4 TPI for broad threading versatility.
• Double-sided design: Most inserts feature two cutting edges to maximize usable life (excluding BSPT/NPT/NPTF/American Buttress/API RD profiles).
• Internal/External threading versatility: For many thread profiles, a single insert can machine both internal and external threads, reducing tool changes (with exceptions for ISO / UN / NPSM / UNJ / Acme).
• UNJ-ready: Specifically suited for UNJ thread forms, aligned with the 21I18UNJ designation for precise UNJ applications.

Designed to streamline threading work, this insert helps shops reduce downtime and tooling costs. The TiAlN-coated carbide body maintains edge life under demanding passes, while the range of available lengths and broad profile coverage lets you tackle a wide variety of threading tasks with a single insert family. Whether you’re producing fine pitches or coarser threads, you can expect consistent performance, clean finishes, and reliable repeatability across multiple jobs.