The Carmex Spiral Mill Threading Insert for NPT is a precision threading solution designed for engineers, machinists, and shops that need reliable National Pipe Thread results across a range of machines—from small CNC centers to heavy‑duty milling setups. Its spiral design enables a smooth cutting operation at a high feed rate, helping reduce machining time on both small components and larger production runs.

Inserts use MT7 Sub‑Micron Grade with Titanium Nitride multi‑layer coating (ISO K10‑K20). This general‑purpose grade works with all materials. Spiral toolholders hold 1 to 9 inserts in a comparatively small cutting diameter, and a unique clamping method enables optimal indexability while reducing vibration and chatter. High‑grade finishes are achievable in threading, end milling roughing, and finishing.

• Spiral design for fast, smooth cutting: Enables a smooth cutting operation at a high feed rate and helps reduce machining time across a wide range of applications.
• Flexible insert capacity with precise indexing: Toolholders accommodate 1–9 inserts in a small cutting diameter, with a unique clamping method that ensures optimal indexability and minimizes chatter.
• MT7 TiN‑coated inserts for all materials: Sub‑Micron MT7 grade with TiN multi‑layer coating (ISO K10‑K20) delivers durable wear life and consistent finishes in threading, roughing, and finishing.

Designed for reliability and long service life, this spiral threading solution supports consistent results from light threading to heavy milling. The combination of smooth spiral cutting, flexible indexing, and durable MT7 TiN‑coated inserts helps you maintain tight tolerances, improve workflow, and reduce tool changes, making it a dependable choice for shops aiming for higher throughput and repeatable quality.