Coupling is a kind of drilling tool in oil field, which is mainly used for tubing connection or casing connection.
Product ParameterTIANJIN DALIPU OCTG., Welcome YouProduction Name3-1/2" N80 API Coupling For TubingOD Size (In)3-1/2"GradeJ55/N80/L80/P110Thread TypeNUEPSLPSL1, PSL 2Stock:2-3/8” 2-7/8" 3-1/2”4-1/2"Steel grade:J55 N80 L80 P110
