Carmex Carbide Threading Insert - Unified - TiAlN Coated - 40E6UNCarmex Carbide Threading Insert Unified TiAlN Coated, model 40E6UN, is engineered for versatile threading across the most common profiles on CNC lathes and manual machines. This TiAlN coated carbide insert delivers reliable performance in a compact, cost effective package, built to handle a variety of threading challenges in one toolholder. Thread profile coverage: A versatile collection that spans all common thread profiles to reduce tool inventories