Carmex FSH solid carbide thread mills are engineered for hard materials and precision UNC/UNF/UNEF/UNS thread production. This No. 4 x 40 tool with an MT3 shank delivers dependable performance in demanding applications, from aerospace components to precision dies.

• Thread format and size: Designed for UNC, UNF, UNEF, and UNS threads; No. 4 x 40 size for reliable fit and finish.
• MT3 shank: Compatible with standard MT3 collets for secure, repeatable mounting.
• Ultra-fine grade with PVD coating: MT3-grade carbide with a multi-layer PVD coating enhances heat resistance and wear life in harsh materials.
• High-flute-count geometry: Up to 7 flutes on selected models improves rigidity, chip evacuation, and surface finish in tough workpieces.
• Fast Type design: Optimized geometry for rapid thread milling, reducing cycle times without sacrificing accuracy.
• Hard material capability: Machining capability up to 65 HRC, making it suitable for stainless steels, nickel-based superalloys, and other hard materials.

The combination of a stable cutting edge, multi-layer coating, and a versatile threading size makes this Carmex thread mill a reliable choice for high-precision internal threads. Expect clean, consistent thread profiles, longer tool life, and reduced burr formation across repeated runs. For best results, pair with appropriate coolant, use conservative feeds and speeds, and perform finish passes to achieve the tight tolerances your parts demand.