Sucker rod coupling is used to connect two sucker rods. The grade is API Grade T.
Spray metal couplings are better in anti-corrosion than common sucker rod couplings.
Slim hole and full size couplings are available.
The size of the coupling 5/8”, 3/4”, 7/8”, 1”, 1 1/8”
Spray metal or not
Slim hole or full size
Sucker rod coupling
Polished rod coupling
Polished rod couplings are designed for connecting polished rod to the top rod of the string. Contrary to rod couplings, polished rod couplings have a female cone that eliminates the coupling twist-off in the course of operation.