Carmex Carbide Threading Insert - NPT - TiAlN Coated - 40-11.5NPTThe Carmex Carbide Threading Insert NPT, TiAlN coated 40 11. 5NPT is a versatile threading solution designed for professionals who need reliable performance across common thread profiles, including pipe threads. TiAlN coated carbide: TiAlN coating delivers increased hardness and wear resistance, helping the insert maintain sharpness at higher speeds and temperatures. Five length options: Available in five lengths that span from 12 mm to 40 mm to