Carmex Carbide Threading Insert - NPTF - TiAlN Coated - 40-8NPTF is a durable, versatile threading solution designed for machinists who need reliable performance across a range of common thread profiles. Built for both internal and external threading tasks, this insert combines precision, toughness, and convenient edge life for everyday metalworking.

• Range of lengths: five available lengths from 12 mm to 40 mm to suit different hole sizes and workpiece configurations.
• Thread profiles supported: designed to cover all common thread profiles with pitches from 0.5 mm (32 TPI) up to 6.0 mm (4 TPI).
• Double‑sided cutting edges: two cutting edges per insert (except for BSPT/NPT/NPTF/American Buttress/API RD) for extended edge life and reduced tool changes.
• Internal & external capability: in many profiles, the same insert can machine both internal and external threads, streamlining tooling and reducing inventory (with typical exceptions noted for ISO/UN/NPSM/UNJ/Acme).
• TiAlN coating: TiAlN coating enhances wear resistance and heat tolerance, helping maintain sharpness on tougher materials and extend insert life.
• Carbide construction: hard carbide substrate provides stiffness and precision for clean, accurate thread profiles across a range of materials.

This threading insert is ideal for machine shops and precision turners who perform frequent threading tasks on metal parts. Its combination of multiple lengths, broad profile coverage, dual cutting edges, and TiAlN-coated carbide design makes it a practical choice for reducing tool changes, improving surface finish, and delivering consistent thread quality across internal and external applications.