Engineered as an evolution of Carmex’s MTSH line, the FSH solid carbide thread mills deliver precise internal threading in the toughest materials. Designed for machinists who demand stability, wear resistance, and fast cutting in hard alloys, this tool excels where others struggle.

• Threading capacity: Compatible with UNC/UNF/UNEF/UNS threads in 5/16" and 3/8" sizes with 24 TPI for accurate, repeatable internal threads.
• Material & shank: Solid carbide construction with an MT3 shank for rigid performance in CNC machines.
• Flute design: Multi-flute geometry with up to 7 flutes (varies by size) to improve rigidity, chip evacuation, and surface finish when machining hard materials.
• Coating: Ultra-fine grade with a PVD multi-layer coating that enhances heat resistance and wear life when cutting materials up to 65 HRC.
• Fast-type cutting: Optimized geometry for efficient material removal without sacrificing edge stability or thread accuracy.

This thread mill is purpose-built for demanding applications, such as internal threads in hardened steels and challenging alloys. The high flute count, robust carbide substrate, and durable coating work together to extend tool life, reduce downtime, and deliver consistent thread quality across batches. Whether you're manufacturing tools, dies, or precision fasteners, this Carmex FSH tool helps you achieve reliable results with fewer passes and tighter tolerances.