The Carmex Carbide Threading Insert - UNJ - TiAlN Coated (21E24UNJ) is a versatile, hard-wearing solution for precision threading on lathes and turning centers. Designed for professionals who need reliable performance across common thread profiles, it blends durability with flexible application in a single insert.

• TiAlN coating: Hard-wearing TiAlN coating boosts hardness and heat resistance for consistent cutting performance at higher speeds.
• UNJ threading compatibility: Specifically engineered to tackle UNJ thread forms, with broad coverage for many standard profiles.
• Five length options: Available in 5 lengths (from 12 mm to 40 mm) to fit a range of tools and workpiece depths.
• Pitch range: Depending on length, supports pitches from 0.5 mm (32 TPI) up to 6.0 mm (4 TPI) for versatile threading tasks.
• Double-edged inserts: Each insert provides two cutting edges for extended use (except for BSPT/NPT/NPTF/American Buttress/API RD where this may not apply).
• Internal & external capability: In many profiles, the same insert can machine both internal and external threads, reducing tool changes (with exceptions for ISO/UN/NPSM/UNJ/Acme).
• Carbide substrate: Solid carbide base delivers rigidity, wear resistance, and stable thread accuracy across multiple passes.

Designed for machinists who value efficiency and consistency, this insert helps you achieve accurate UNJ threads while maintaining tool life. The TiAlN coating minimizes built-up edge and heat, enabling reliable performance across a range of materials and turning speeds. Its versatile length options and broad pitch coverage mean fewer tool changes and a smaller inserts inventory, making it a practical choice for production runs and job shops alike.