... edition. We supply all seamless and ERW casing pipes according to API Spec 5CT latest edition. ... Our casing are produced by the leading OCTG manufacturers in ... N80, C90, T95, P110, HC P110. The outer diameter of casing is ranging from 4 1/2" to 20". 30 ... 13Cr, C90, T95, P110, P110-13Cr, Q125 API Connections Round thread(8tpi, STC and LTC), Buttress thread (5tpi, BTC) ...