J55, K55, L80, P110, H40, C90, Q125 casting pipes and X42, X46, X52, X56, X60, X65 Pipeline. BTC, LTC, STC thread and coupling. Standard: ASTM Material: API5CT, J55, K55, L80, N80, C90, P110 and so on Length: 6M-14M, R1, R2, R3 length can be manufactured by customer requirement OEM: can be required ISO 9001 certification