... Grade J55, K55, N We supply all sizes and grades of casing and tubing, both Seamless and ERW.Manufacturing methodCold Drawn or Hot-rolled ... Seamless, ERW, LSAW ERW, Hot-rolled and ... C90, T95, P110, Q125 API Connections Round thread(8tpi, STC and LTC), Buttress thread (5tpi, BTC) Non upset (NUE), External ...