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OCTG Couplings for Casing and Tubing

The OCTG coupling is a short length of pipe used to connect two joints of casings or production tubings. Unlike ordinary couplings, it effectively solves the problem of fatigue fracture that is easily caused by the stress concentration. The coupling is normally made of the same grade of steel as the casing or tubing.

Many customers may require a layer of color coating to be placed onto their product so that they can easily recognize their products after off-loaded at the discharging port. Each steel grade comes with a different color for easy identification.


All the OCTG couplings are manufactured according to API 5CT and 5B specifications. The coupling specified as API comes female threaded cylinder used for connecting two pipes with male threaded ends. The API 5CT grade coupling is an integral part to the production tubing and pipe casing. According to the types of threads cut onto the casing, users should select the correct coupling to accommodate the thread. Currently available with the product are types: one with common thread and the other with knuckle thread.

Tubing Coupling: A kind of joint used to connect two oil pipes.

OD: 19/8", 23/8", 7/2", 4", 9/2"

Threads: NUE - Non Upset End
EUE - External Upset End

Steel Grade: H40, J55, K55, M6, N80-1, N80Q, L80, C95, C90, T95, P110, Q125

Casing Coupling: A kind of coupling that connects two casings.

OD: 4-1/2",5", 5-1/2", 6-5/8", 7", 7-5/8", 8-5/8", 9-5/8", 10-3/4", 11-3/4", 13-3/8", 16", 18-5/8",20"

Threads: Short round threads and couplings (CSG)
Long round threads and couplings (LCSG)

Buttress threads and couplings (BCSG)

Steel Grade: H40, J55, K55, M65, N80-1, N80Q, L80, C95, C90, T95, P110, Q125

We accept small quantity order. Samples are also available. Our company is a professional pipe coupling manufacturer and supplier based in China. We can provide a wide range of pipe products, including the pipe casing, production tubing, oil line pipe, OCTG coupling, pup joint, thread protector, seamless steel tube, electric resistance welded tube, longitudinal submerge-arc welded large-diameter tube, spiral submerged arc welded tube, square steel tube, and galvanized steel tube. The product can be machined to multiple domestic and international standards, including GB, ASTM, API, DIN, and JIS.

Related Names
Drill Pipe Connection Fittings | Oil Pipe Connector | Threaded Coupling

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