... N We supply all sizes and grades of casing and tubing, both Seamless and ERW.Manufacturing methodCold Drawn or ... T95, P110, Q125 API Connections Round thread(8tpi, STC and LTC), Buttress thread (5tpi, BTC) Non upset (NUE ... ), External upset (EUE), Round thread (8RD and 10RD) Premium Connections HSM, TP-CQ, RJS (compatible ... coating; Vacuum insulated; HDPE liner Casing and Tubing in API Spec 5CT