... form: round & buttress 3,coating:TiN TiALN AL2O3 TiCN 4,for oil pipe and drillrod 1,Specifications: 4 TPI, 5 TPI, 8 TPI, ... TiN, TiCN, Al2O3, TiALN4,Application: J55, N80, P110Our Carbide API Inserts are used for machining casings, tubings, leadout pipes, drill ... and convenient clamping, finished teeth ground to a "narrow" API tolerance and excellent cutting performance.The multi-layer-coating inserts ...