Carmex Thread Mills Solid Carbide - Internal Thread - UN (UNC UNF UNEF UNS) - 5/16 x 24 - MT7The Carmex MT line solid carbide internal thread mill delivers precise, efficient internal threading for UNC UNF UNEF UNS threads. Designed for a 5 16" major diameter with 24 TPI and MT7 tooling, its built for shops that demand reliable, cost effective thread milling. Tool Type: Solid carbide internal thread mill engineered for clean, consistent internal threading in holes. Threading Standards: Supports internal threads in UNC, UNF, UNEF, and UNS