API Couplings are brief items of casing or tubing utilized as a sort of link in between the specific joints. They are usually made from the exact same quality of steel as the casing or tubing.
As required by API 5 CT standards, the couplings are always given color layer in order to differ the steel grade.
All the casing & tubing casings are made of top quality coupling stock from pre-qualified seamless pipe mills. High-speed CNC lathes ensure the preciseness of the finished couplings. And the couplings should be manufactured according to API 5CT and 5B standards.
Standard: API 5CT & 5B
Steel Grade: H40,J55, K55, N80, R95,L80, C90, T95, P110, Q125
Dimension: Tubing coupling from 2-3/8″ to 4-1/2″, Casing coupling from 4-1/2″ to 20″
End finish: NUE, EUE (tubing coupling); STC, LTC, BTC (casing coupling)
Colors: J55/ K55-Bright Green,P110-White, N80/ L80-Red etc
PACKING: by wooden cases, wooden pallet, or as per customer request