The Carmex Spiral Mill Threading Insert for NPT is a precision threading solution designed to deliver fast, clean National Pipe Taper (NPT) threads on a wide range of materials. Built for both small-component work on compact CNCs and heavy-duty milling on larger machines, it enables smooth cutting at high feed rates to reduce cycle times without compromising accuracy.

Designed for versatility, this spiral threading system uses toolholders that can accommodate 1 to 9 inserts in a compact cutting diameter, with a unique clamping method that ensures reliable indexability and quick insert changes. The result is reduced vibration and chatter, delivering a high-quality finish across threading, end milling, roughing, and finishing applications.

• Effortless high-feed threading: The spiral geometry enables smooth cutting at high feed rates, cutting cycle times and delivering consistent thread quality on both small and larger parts.
• Flexible indexing and low downtime: Spiral fluted toolholders hold 1–9 inserts in a small cutting diameter, with a precise clamp that ensures dependable indexability and fast insert changes.
• Durable MT7 TiN-coated inserts for universal materials: MT7 sub-micron grade inserts with Titanium Nitride multi-layer coating (ISO K10–K20) provide long wear life and broad material compatibility for threading, roughing, and finishing.

This insert family supports reliable, repeatable results across a variety of materials and applications, helping you streamline setup, reduce scrap, and boost overall productivity. With its robust coating and versatile fastening, you can trust it to maintain performance from first part to last, delivering consistent finishes and dependable tool life in demanding manufacturing environments.