Carmex Thread Mills Mini Type - For Hard Materials - UN (UNC UNF UNEF UNS) - No. 8 x 32 - MT9Carmex Thread Mills Mini Type are solid carbide thread mills engineered for high performance internal threading in hardened materials. Designed to meet UN thread standards (UNC, UNF, UNEF, UNS) with a compact No. 8 x 32 size and MT9 shank, they deliver reliable results in challenging workpieces. Solid carbide construction: Exceptional wear resistance and the ability to machine hardened materials up to 62 HRc for long tool life and consistent threads.