... , K55, N80, P110 etc. 2> Specifications:OD: 114-325mm, thickness: 6-40mm, length: 6m-13m. API 5CT oil tube:1>Material: J55 ... , K55, N80, P1102>Standard: API/ASTM/EN/DIN/GB3>Specifications:1. outside diameter: 114-325mm2. thickness: 6-40mm3 ... : cold drawn, hot rolling7>Payment: L/C or T/T API 5CT oil tube