API 5CT · OCTG supply & export
Casing and tubing couplings, pup joints, crossover subs and seamless tubulars for oilfield distributors, stockists and drilling contractors. One quotation covers the price, the packing, the export documents and the shipping schedule.
Product range
The coupling is our core line, and everything that has to match it — pup joints, adapter subs, tubulars, protectors and gauges — ships from the same supply chain.
Threaded coupling for casing strings, machined to API 5CT and 5B dimensions in STC, LTC and BTC profiles.
EUE and NUE couplings for tubing strings, with phosphate or copper-plated thread finish on request.
Short-length joints cut and threaded from the same heat as the string, so the tally stays consistent.
Adapter subs joining two different thread forms, machined from 4140 / 42CrMo bar stock.
API 5CT PSL1 / PSL2 seamless tubulars, supplied with matching couplings and mill test certificates.
Thread protectors, API thread compound and API 5B working gauges to keep every joint inspection-ready.
Why buyers stay
We are not a trading layer stacked on another trading layer. We buy from the mill that machines the thread, and we stay on the file from quotation to discharge.
Your order goes to the mill that cuts the thread. No agent chain, no margin stacked twice between your PO and the machine shop.
Mill test certificate per heat number, plus dimensional and thread inspection records on request.
From one pallet upward, with LCL consolidation if you are not ready for a full container yet.
Send sizes, grades and quantities — you get price, lead time and a packing plan by return.
Invoice, packing list, certificate of origin, and SGS / BV / TUV inspection booked before shipment.
English, Spanish, French and Arabic — the same person answers from first enquiry to delivery.
Quality & inspection
Threads are where OCTG failures start, so inspection happens at the thread, not only at the mill gate. Records travel with the shipment, and third-party witnesses can be booked on request.
Applications
The same part serves very different buyers — which is why we quote by size, grade and thread form rather than by catalogue page.
Casing and tubing strings for exploration and development wells.
Production strings, packers and completion accessories.
Replacement joints and couplings for pulling and workover jobs.
Oilfield supply houses keeping fast-moving sizes on the shelf.
About us
Hengsheng Technology Trade Co., Limited is an independent exporter of OCTG connections and tubulars, based in Hong Kong, China and working with mills in Tianjin, Jiangsu and Shandong.
We have supplied API 5CT couplings to oilfield buyers since 2016 — first into Ecuador, then into other Andean and West African markets. Small enough to answer you yourself, structured enough to handle a full container and its documents.
Get in touch
Tell us the sizes, grades, thread forms and quantities you need. If a specification is unclear, describe the string and we will map it to the right coupling.