... THREAD3,Coating: TiN, TiCN, Al2O3, TiALN4,Application: J55, N80, P110Our Carbide API Inserts are used for machining casings, tubings, leadout pipes ... , drill rod connectors, oil suching rods, separators, V-thread and buttress thread for oil industry as ... of CNC machines.As a majore and professional manufacturer of carbide oil threading inserts in China, we can offer you ...