... 1. On sale seamless API-5CT Casing pipe, Tubing pipe, Coupling, OCTG, Oil pipe.2. Our factory manufacture Casing pipe, Tubing pipe, OCTG, Oil pipe for oilfield: According to API ... 2-3/8"to 4-1/2"(EUE/NU)5. Casing pipe: From 4-1/2" to 20",6. Threads: BTC, LTC ... range: R1, R2, R38. If you interested in our Casing pipe, Tubing pipe, Coupling, OCTG, Oil pipe, feel free to contact with me. API 5CT ...