Carmex Carbide Threading Insert - Unified - TiAlN Coated - 21I7UNThe Carmex Carbide Threading Insert Unified TiAlN Coated (21I7UN) is a versatile threading solution designed for workshops that need reliable, high precision threads across multiple profiles. Built for machinists who value flexibility and edge life, this unified insert family reduces tool changes while delivering consistent performance on both internal and external threads. Thread profile coverage: A versatile collection of threading inserts that