Carmex Thread Mills Mini Type - For Hard Materials - UN (UNC UNF UNEF UNS) - No. 1 x 72 - MT9Carmex Thread Mills Mini Type are solid carbide tools engineered to cut internal threads in hardened materials with precision and reliability. Designed for professionals who need durable tooling that can handle tough steels up to 62 HRC, these mills deliver consistent thread quality and a smooth surface finish. Tool type: Solid carbide internal thread mill designed for machining hardened materials. Material capability: Optimized to cut hardened