Carmex Thread Mills Mini Type - For Hard Materials - MJ - MJ 4 x 0.7 - MT6Carmex Thread Mills Mini Type are solid carbide tools engineered to cut precision threads in hard metals. Designed for machinists and production environments, these compact tools deliver dependable performance for M40. 7 threads in components up to 62 HRc. Nominal size and thread form: 4 mm cutting diameter with a 0. 7 mm pitch (M40. 7) for precise, repeatable thread generation. Mini Type MJ design: compact geometry optimized for tight cavities and