Carmex Thread Mills Solid Carbide - Internal Thread - UN (UNC UNF UNEF UNS) - 1/2 x 13 - MT7The Carmex MT line delivers precision internal thread milling with solid carbide tooling, designed for shops that demand reliable 1 2 13 internal threads in metal parts. With an MT7 shank and a 35 flute geometry, it offers efficient, cost conscious threading for UNC, UNF, UNEF, and UNS standards. Internal Thread Milling for UN sizes: Specifically engineered to create internal threads compatible with UNC, UNF, UNEF, and UNS standards. Thread Size: 1 2