We carry size range of 2-3/8”, 2-7/8″, 3-1/2″,4″ and 4-1/2″ in J55, K55, N80, P110 grade. All of our couplings meet the API Specifications 5CT/5B.

Couplings are short lengths of pipe used to connect 2 joints of tubing or casing. They come with painted colour codes on their external surface to indicate their grades.

API EUE Tubing Couplings

Designed in accordance with API 5CT/5B and are made of good seamless steel. EUE petroleum tubing coupling cover the outer diameter from 77.80mm to 141.30mm, that is bigger than the outer diameter of the non upset threaded end product. The API external-upset-end (EUE) tubing connection is widely used because it is a good, serviceable connection in most wells. The EUE joint has a designed joint strength in tension and pressure strength greater than that of the pipe body and, therefore, is considered a 100% joint efficient connection.

API NUE Tubing Couplings

Designed in accordance with API 5CT/5B and are made of good seamless steel. NUE tubing coupling possesses the outer diameter range from 73.02 to 132.08mm. API nonupset (NUE) tubing is used much less than EUE tubing. The cost of NUE is only slightly less than EUE, and the joint strength is substantially less. The coupling joint diameter of NUE is less than EUE, which offers some advantages when clearance is small.

1.Size: 2-3/8” 2-7/8″, 3-1/2”, 4″, 4-1/2″

2.Standard: API 5CT /5B

3.Type: EUE NUE

4.Grade:J55/K55/N80/L80/P110

5.Packaging: wooden pallet, tight wrapped /W paper carton

Raw Material Selection

Mechanical test including tensile strength

Impact test

Chemical properties control

Sulfide stress cracking test (for Material grades in C90 or T95)

Size tolerances, OD, Wall Thickness, Length and Straightness

Threads control, threads quantity per inch, threads angle etc (Premium threads option will be more rigorous)

Heat treatment

Additional markings

Material certification

Product Specification Level (PSL-2 or PSL-3)