The Carmex Carbide Threading Insert - Unified TiAlN Coated (21I7UN) is a versatile threading solution designed for workshops that need reliable, high-precision threads across multiple profiles. Built for machinists who value flexibility and edge life, this unified insert family reduces tool changes while delivering consistent performance on both internal and external threads.

• Thread profile coverage: A versatile collection of threading inserts that covers all common thread profiles, simplifying inventory and setup.
• Five length options: Available in 12 mm to 40 mm lengths, with the ability to handle pitches from 0.5 mm (32 TPI) to 6.0 mm (4 TPI) depending on length.
• TiAlN coated carbide: Tungsten carbide inserts with a TiAlN coating for enhanced hardness, heat resistance, and longer edge life at higher cutting speeds.
• Double-sided cutting edges: Each insert offers two cutting edges (except for BSPT/NPT/NPTF/American Buttress/API RD), increasing usable life and reducing downtime between changes.
• Internal/External threading compatibility: For many thread profiles, the same insert can machine both internal and external applications (with exceptions for ISO/UN/NPSM/UNJ/Acme).

Designed for production and precision work alike, this unified insert helps you complete a wider range of threading tasks with fewer tool changes. The TiAlN coating supports aggressive feeds and harder materials, while the dual-edge geometry and broad profile coverage translate to cleaner threads, tighter tolerances, and more consistent results across jobs.