FAQ
Frequently asked questions
Which standards apply to OCTG Couplings & Accessories?
TUOJING supplies octg couplings & accessories to API 5CT, API 5B. Each product page lists its governing standard, grades and size range.
Does TUOJING ship OCTG Couplings & Accessories to Iran and the Gulf?
Yes. We consolidate and route octg couplings & accessories to the major Gulf ports (Jebel Ali, Dammam) and Bandar Abbas, with mill certification and customs support.