Designed for machinists and precision workshops, the Carmex Carbide Threading Insert - Unified - TiAlN Coated (21I18UN) delivers reliable performance across the most common Unified thread profiles. Its carbide body, TiAlN coating, and versatile length options make it a practical, long-lasting choice for both internal and external threading tasks.

• Coating: TiAlN coating enhances hardness and heat resistance, helping maintain sharp cutting edges at higher speeds for cleaner threads and longer tool life.
• Double‑sided design: Each insert offers two cutting edges to maximize usage per edge and reduce downtime (except for BSPT / NPT / NPTF / American Buttress / API RD profiles).
• Thread profile coverage: A versatile collection that spans the most common Unified thread profiles, simplifying material removal and threading operations in a single insert family.
• Length options: Five available lengths spanning from 12 mm to 40 mm, providing reach and rigidity for a range of tool holders and workpiece geometries.
• Pitch range: Depending on length, supports pitches from 0.5 mm (32 TPI) up to 6.0 mm (4 TPI), enabling both fine and coarse thread production.
• Internal/External compatibility: For many thread profiles, the same insert can machine both internal and external threads, streamlining setup and reducing tool inventory (excluding ISO / UN / NPSM / UNJ / Acme).
• Material: Solid carbide body delivers rigidity, wear resistance, and precise thread geometry essential for consistent thread quality.

This unified threading insert is ideal for shops performing a variety of threading tasks on lathes and milling machines. Use it to standardize tooling across common Unified threads, cut both internal and external threads where applicable, and extend tool life with a hard-wearing TiAlN coating. Its five length options let you tailor reach and rigidity to your specific setup, while the double-edged design minimizes changes and downtime. For operators seeking a practical, all-in-one threading solution, this Carmex insert family offers dependable performance and straightforward usability in everyday metalworking.