Casing Couplings‑High‑Strength Connection Components for Casing Joints

Casing coupling is a dedicated connecting part for oil casing, featured with internal threads on both ends. It connects two casing pipes and guarantees the integrity, sealing and tensile capacity of the whole string per API 5CT specification.

Coupling threads match casing threads precisely, including STC, LTC, BTC and premium connections. Full steel grades such as J55, K55,N80, L80, P110 are available for ordinary wells, gas wells and deep‑well applications.

Downhole couplings bear axial tension, external formation pressure and internal fluid pressure. Qualified couplings go through quenching & tempering heat treatment to obtain proper hardness and impact toughness. Precision‑machined threads avoid leakage and loosening risks.

We supply standard couplings, premium‑thread couplings and special‑size couplings. Complete sizes and short lead‑time support various oil‑field site requirements.