Meet the Carmex Carbide Threading Insert – NPSM, TiAlN Coated, 21I11.5NPSM. This all-in-one threading solution is designed for machine shops and professionals who demand reliable, versatile inserts that cover a broad range of thread forms with minimal tool changes.

• Five length options: available from 12 mm to 40 mm to fit a variety of work envelopes and depth requirements.
• Wide pitch range: capable of threading from 0.5 mm (32 TPI) up to 6.0 mm (4 TPI), covering standard and coarse profiles.
• TiAlN-coated carbide: enhances wear resistance and heat tolerance for longer tool life and consistent cuts in demanding materials.
• Double-sided cutting edges: each insert provides two cutting edges (except BSPT/NPT/NPTF/American Buttress/API RD), extending usable life before indexing.
• Internal & external threading versatility: for many profiles, the same insert can machine both internal and external threads, with exceptions for ISO/UN/NPSM/UNJ/Acme profiles.

Engineered for precision and efficiency, this insert delivers clean, accurate threads across a wide range of forms. The TiAlN coating helps maintain edge life during high-speed passes, while the multi-length selection reduces downtime and inventory needs by covering short, medium, and deep threading tasks. The dual-edge design means you can rotate or reindex the insert to maximize usage between replacements. Note the internal/external threading capability varies by thread standard, so review profile requirements (ISO, UN, NPSM, UNJ, Acme) to select the optimal approach for each job.