Couplings produced by our company include sucker rod coupling, sub-coupling and polished rod coupling.

Sucker rod coupling has the same box-thread in both ends. It is used for connecting the same size of sucker rods and/or the sinker bars with sucker rod pin-thread.

Sub-coupling has the different box-thread in both ends. It is used for connecting the two sizes of sucker rods and/or a polished rod to a sucker rod string.

Polished rod coupling is used for connecting a polished rod and/or the sinker bars with polished rod pin-thread to the sucker rod string.