API Standard Reducer Sub-Coupling for Sucker Rod

API Standard Reducer Sub-Coupling for Sucker Rod is a special transition member of sucker rod coupling series, fully manufactured in compliance with API Spec 11B 28th Edition. It connects sucker rods with different thread sizes at both ends, solving the assembly difficulty of mismatched rod strings downhole, and is extensively applied in old oil well renovation and mixed sucker rod matching projects. Two base material options are available with full material grade coverage to adapt to diverse downhole working conditions. Carbon steel reducer sub couplings offer prominent cost efficiency, suitable for conventional shallow wells free of corrosive media. Alloy steel couplings feature superior tensile strength and comprehensive mechanical properties for extended service life. For ultra-deep, high-pressure and harsh downhole environments, customized high-strength versions are available with excellent anti-fatigue and anti-deformation performance. Apart from reducer sub couplings, we a…