... ,2,Thread: ROUND THREAD, BUTTRESS 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 well as gas thread for geological applications in ...