Carmex Thread Mills Mini Type - For Hard Materials - UN (UNC UNF UNEF UNS) - No. 2, No. 3 x 56 - MT9Carmex Mini Type solid carbide thread mills are precision tools designed to create internal threads in hardened materials with stability and clarity. Built for engineers and machinists who work with tough alloys, these compact mills deliver reliable performance, clean thread profiles, and long tool life, even when working up to 62 HRC. Miniature design for hard materials: Compact geometry that accesses tight cavities and restricted spaces without