The Carmex FSH Thread Mills are high-performance solid carbide tools designed for fast, precise thread milling in hard materials. Sized No. 4 x 40 with MT3 shank, they’re built for engineers and machinists who demand reliable UNC/UNF/UNEF/UNS thread forms in hardened alloys up to 65 HRC.

• Thread size and standard: No. 4 x 40 thread, compatible with UNC, UNF, UNEF, and UNS thread forms for versatile threading in a single toolpath.
• Shank size: MT3 shank designed for rigid mounting on standard CNC tool holders.
• Material: Solid carbide construction delivers exceptional hardness resistance and long tool life in demanding materials.
• Flute count: Up to 7 flutes, boosting rigidity and efficient chip evacuation for hard materials.
• Coating: Ultra-fine MT3 grade with a PVD multi-layer coating providing high heat and wear resistance for machining superalloys and hard materials up to 65 HRC.
• Performance: Enhanced cutting edge stability and reduced tool deflection at high speeds for precise thread forms.

The FSH line represents an advancement over traditional thread milling tools, combining a higher flute count with a rugged coating to deliver reliable threads in materials that challenge standard tooling. With MT3 compatibility and No. 4 x 40 sizing, these mills fit a broad range of fasteners and joint configurations, helping you achieve clean, accurate threads with minimal burrs and consistent pitch. Ideal for aerospace, automotive, and industrial manufacturing where hardened materials and precise threading matter most.