Carmex Carbide Threading Insert - Unified - TiAlN Coated - 40I4UNCarmex Carbide Threading Insert Unified, TiAlN coated tooling designed to cover the most common thread profiles in a single, versatile solution. The 40I4UN edition is ideal for machinists and shops that value fast setups, consistent results, and reduced tooling inventory. TiAlN coated carbide substrate: Hardened, wear resistant coating that helps sustain sharpness and extend insert life at typical threading speeds. Five lengths (1240 mm): A range that