... ", 20", 30" Grade J55, K55, N We supply all sizes and grades of casing and tubing, both Seamless and ERW.Manufacturing methodCold Drawn or Hot-rolled ... -9Cr, L80-13Cr , C90, T95, P110, Q125 API Connections Round thread(8tpi, STC and LTC), Buttress thread (5tpi, BTC) Non upset (NUE ...