Our factory manufacture casing, tubing according to API SPEC 5CT
Steel grade: J55, K55, L80, N80, C95, P110
OD range tubing: 2-3/8" to 4-1/2" (EUE/NU)
Casing: 4-1/2" to 20"
Threads: BTC, LTC, STC
Length range: R1, R2, R3
If you have any question, hope you feel free to contact us