The Carmex Carbide Threading Insert – UNJ, TiAlN Coated (21I14UNJ) is a durable, precision carbide insert designed for UNJ threading on metal parts. Built for machinists and shops that tackle a range of common thread profiles, it delivers reliable performance on CNC lathes and turning centers.

• TiAlN coating: TiAlN-coated carbide delivers excellent wear resistance and heat tolerance for higher-speed threading and longer tool life.
• Designation: 21I14UNJ, engineered specifically for UNJ thread profiles.
• Five lengths: five available lengths spanning from 12 mm to 40 mm to fit different toolholders and reach requirements.
• Pitch range: handles pitches from 0.5 mm / 32 TPI up to 6.0 mm / 4 TPI across the selectable lengths.
• Double-sided cutting edges: two cutting edges extend tool life; note exceptions for BSPT/NPT/NPTF/American Buttress/API RD threads where edge configuration differs.
• Internal/External capability: for many thread profiles, the same insert can machine both internal and external threads, though this interchangeability does not apply to ISO / UN / NPSM / UNJ / Acme.
• Versatile and precise: designed to cover all common thread profiles with consistent geometry to support accurate, clean threads and repeatable results.

Ideal for job shops and production environments requiring a compact, reliable tool for UNJ threading across a range of pitches. The TiAlN coating improves performance in demanding cutting conditions, while multiple lengths provide flexibility to optimize chip load and engagement for your specific machine setup.