Carmex Thread Mills Solid Carbide - Fast Type - For Hard Materials - UN (UNC UNF UNEF UNS) - No. 6 x 32 - MT3Carmex Thread Mills in solid carbide Fast Type are designed for machinists who demand precise, durable threaded holes in the toughest materials. Built to handle hard alloys and superalloys, these cutters deliver clean UN thread forms with reliable stability. Thread forms: Supports UN family threads (UNC, UNF, UNEF, UNS) for versatile, plug and thread applications. Size and shank: No. 6 x 32 thread size with MT3 ultra fine shank for strong, rigid