CỦA: 4-1/2“ to 20“/ 114.3mm to 508mm Wall Thickness: 5.21 - 16.13 mm Thread: STC.BTC.LTC Length: R1(4.88-7.62M). R2(7.62-10.36M). R3(10.36-14.63Mét) Tiêu chuẩn: API 5CT Grade: J55, K55, M65, N80,N80-1, N80-Q, L80-1, L80-9Cr, L80-13Cr, C90, C95, T95, P110, Q125