The Carmex Spiral Mill Threading Insert for NPT threads is a versatile cutting solution designed for threading and milling tasks across machines—from compact hobbyist mills to high‑power production centers. Its spiral flute design delivers smooth cutting at high feed rates, helping you reduce cycle times and improve throughput on both small components and demanding applications. The system uses a spiral toolholder that can accommodate 1 to 9 inserts in a compact cutting diameter, with a unique clamping method that ensures reliable indexability and repeatable results. Inserts are available in MT7 Sub‑Micron Grade with Titanium Nitride multi‑layer coating (ISO K10–K20), a general‑purpose option that works with a wide range of materials.

• Smooth, high‑feed cutting: The spiral geometry enables smooth cutting at high feed rates, reducing machining time and boosting productivity for threading and milling operations.
• Versatile insert capacity and indexing: Spiral fluted toolholders hold 1 to 9 inserts in a small cutting diameter, and a unique clamp provides optimal indexability for consistent results across multiple passes.
• Low vibration and durable finish: The spiral design minimizes vibration and chatter, while MT7 Sub‑Micron Grade inserts with TiN multi‑layer coating (ISO K10–K20) deliver reliable wear resistance and a high‑quality finish across threading, roughing, and finishing tasks.

This combination helps you streamline workflows, reduce downtime, and achieve dependable, repeatable results on a broad range of materials and applications—from precision small‑part threading to heavy‑duty milling on tough workpieces.