Introducing the Carmex Carbide Threading Insert for NPT, a TiAlN-coated carbide insert designed for professional threading tasks. Built for machinists and fabrication shops, it delivers precise, repeatable NPT and common-thread profiles with durable performance on both internal and external threads.

• Coating: TiAlN coating enhances wear resistance and heat tolerance for longer tool life in demanding threading applications.
• Material: Carbide substrate provides stiffness, sharpness, and consistent cutting action across different thread forms.
• Model/Code: 21-11.5NPT, specifically tailored for NPT thread work and related profiles.
• Length options: Five lengths available (12 mm to 40 mm) to fit various hole depths, collars, and shoulder constraints.
• Pitch range: Compatible with pitches from 0.5 mm (32 TPI) to 6.0 mm (4 TPI), covering the most common threading needs.
• Double-sided edges: Insert is double-sided with two cutting edges on most profiles, extending usage life (note: BSPT/NPT/NPTF/American Buttress/API RD may not use the second edge).
• Internal/External threading compatibility: For many thread profiles, the same insert can machine both internal and external threads, reducing tool changes and inventory (with profile exceptions such as ISO/UN/NPSM/UNJ/Acme).

Designed for efficiency and reliability, this insert supports precise thread forms across a wide range of standard profiles while delivering the stability of TiAlN-coated carbide. It’s an excellent choice for pipe fittings, valves, housings, and other components where consistent thread quality and tool life matter—whether you’re setting up batch runs or performing quick-turn jobs.