Carmex Carbide Threading Insert – Unified, TiAlN coated, 21E16UN is a versatile threading solution built for precision and reliability across common thread profiles. Designed for machinists and shops that need a single, robust insert capable of handling a range of internal and external threads, it delivers consistent results with minimal tool changes.

• Coating: TiAlN-coated carbide for improved wear resistance and heat handling, extending insert life in tougher cutting conditions.
• Threading coverage: Unified threading inserts that cover all the most common thread profiles, reducing the need to stock multiple inserts.
• Length options: Five lengths available (from 12 mm to 40 mm) to fit different tooling setups and depth requirements.
• Cutting edges: Double-sided design with two cutting edges per insert (except for BSPT/NPT/NPTF/American Buttress/API RD profiles), maximizing usable life.
• Internal/External capability: For many thread profiles, the same insert can machine both internal and external threads, reducing inventory and setup time (with exceptions for ISO/UN/NPSM/UNJ/Acme).
• Pitch range: Suitable for pitches from 0.5 mm (32 TPI) up to 6.0 mm (4 TPI), enabling a wide range of thread sizes.
• Series designation: 21E16UN, a unified system designation that supports consistent performance across common threading tasks.

This threading insert delivers practical value by combining durability, versatility, and efficiency. The TiAlN coating helps maintain dimensional accuracy and smooth surface finishes, while the dual-edged design and broad pitch range reduce tool changes and stocking needs. Ideal for workshops and production environments that require reliable, multi-profile threading performance without sacrificing precision or productivity.