The Carmex Carbide Threading Insert (Unified, TiAlN coated, 21E20UN) is a versatile threading solution designed for shops that run multiple thread profiles. Built for precision on CNC lathes and milling centers, it delivers consistent performance across the most common threading needs with a single, reliable insert system.

• Five length options: Available in five lengths ranging from 12 mm to 40 mm to match different threading tasks and toolholder setups.
• Wide thread-profile coverage: Designed to cover all common thread profiles with one unified insert family.
• Double‑sided cutting edges: Each insert features two cutting edges for extended use; note exceptions for BSPT, NPT, NPTF, American Buttress, and API RD profiles.
• Internal & external threading compatibility: For many profiles, the same insert can machine both internal and external threads, reducing tool changes (exceptions apply for ISO, UN, NPSM, UNJ, and Acme).
• TiAlN coating: TiAlN coating enhances wear resistance and heat tolerance for longer tool life and stable thread quality.
• Carbide construction: Precision-ground carbide provides strong rigidity and consistent thread geometry across cuts.
• Part number: 21E20UN for precise identification and ordering.

This single insert system helps you simplify tooling, minimize downtime from tool changes, and maintain repeatable thread quality across a wide range of profiles. The combination of dual cutting edges, robust carbide substrate, and TiAlN coating translates to reliable performance in both light-duty and heavier threading operations. Ideal for job shops, contract manufacturers, and maintenance environments that require flexible, dependable threading capabilities without juggling multiple insert types.