The Carmex Carbide Threading Insert for UNJ, TiAlN coated (model 21E20UNJ) is a versatile solution for precision threading across common profiles. Built for machinists and workshops that value consistent performance and long tool life.

• Material: Solid carbide substrate for rigidity and wear resistance in demanding threading operations.
• Coating: TiAlN coating enhances hardness and heat resistance, helping maintain cutting efficiency during high-temperature threading.
• Thread profiles: Covers all common thread profiles in one insert family, streamlining setup for diverse projects.
• Lengths: Five lengths available, from 12 mm to 40 mm, to fit different hole depths and workpiece geometries.
• Pitch range: Depending on length, capable of threading pitches from 0.5 mm (32 TPI) to 6.0 mm (4 TPI).
• Double cutting edges: Inserts are double-sided with two cutting edges (except for BSPT/NPT/NPTF/American Buttress/API RD variants) for extended use between indexings.
• Internal/External capability: For many thread profiles, the same insert can machine both internal and external threads, with exceptions for ISO/UN/NPSM/UNJ/Acme.
• Designation: 21E20UNJ, a precise identifier to ensure you select the UNJ-specific variant.
• Brand: Carmex, a trusted name in carbide tooling and threading solutions.

This insert is designed to deliver reliable thread quality with minimal tool changes thanks to its dual-edge design, while the TiAlN coating provides resilience under heat and friction. Its five length options let you tailor engagement and reach to your specific machining setup, helping you achieve consistent thread profiles across a variety of workpieces without inventory clutter. Ideal for shops performing both routine and mixed-threading tasks where durability and precision are essential.