OCTG Coupling is used to connect the casing and tubing, sizes form 1.315inchs to 20 inches O.D., material grade J55, K55, N80, L80, P110, etc., according to API SPEC 5CT Standard.
China API SPEC 5CT Grade N80 Tube Coupling Supplier Derbo Provides API SPEC 5CT Grade N80 Tube Coupling, Size 3-1/2 Inch EUE, Black Painting Treatment.
China API 5CT K55 Tube Coupling Manufacturer Supplies API Spec 5CT Grade K55 Tubing and Casing Coupling, Hot Rolled, Size 4-1/2 Inch, Painting Surface.
China API 5CT Coupling Manufacturer Derbo Offers API 5CT Coupling, K55, 13-3/8, Hot Rolled, Oiled/Painting/Galvanized/Coating, Gas & Oil Transportation
