The Carmex Spiral Mill Threading Insert for NPT (H15-14NPTMT7) is a high-performance threading solution designed for National Pipe Taper threads. It’s built to handle everything from small batches on compact machines to heavy-duty milling on larger centers, delivering smooth cuts at higher feed rates.

Inserts use MT7 sub-micron grade with a TiN multi-layer coating (ISO K10–K20), providing versatile wear resistance across materials. Spiral flutes and a unique clamping method ensure reliable indexability, while the toolholder supports 1 to 9 inserts in a compact cutting diameter for flexible, efficient machining.

• Smooth, high‑feed cutting: The spiral design enables a smooth cutting operation at a high feed rate, reducing machining time and boosting productivity.
• Flexible insert capacity with precise indexability: Spiral toolholders hold 1 to 9 inserts in a compact diameter, with a unique clamp system delivering reliable, accurate indexing for quick, repeatable setups.
• MT7 TiN-coated inserts for all materials: Inerts are MT7 sub-micron grade with Titanium Nitride multi-layer coating (ISO K10–K20), a general-purpose grade suitable for all materials, delivering consistent finishes in threading and milling with strong wear resistance.

Together, these features help you complete projects faster with less downtime, maintain consistent thread quality and surface finish across materials, and extend tool life in demanding machining environments. This translates to more predictable results, fewer tool changes, and improved overall workflow in threading, end milling roughing, and finishing tasks.