... : TiN, TiCN, Al2O3, TiALN4,Application: J55, N80, P110Our Carbide API Inserts are used for machining casings, tubings, leadout pipes, drill rod ... ground to a "narrow" API tolerance and excellent cutting performance.The multi-layer-coating inserts have special properties of wear ... China, we can offer you a complete line of API threading Inserts for your application.Our customers are ranging from steel ...