Business Type: Manufacturer/Factory & Trading Company
Dongying, Shandong, China
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.
Sub-couplings have different sizes of box threads in each end and are used for connecting two sizes of sucker rods or a polished rod to a sucker rod string. Sub-couplings may be used on sucker rods or polished rods
|pin size in||full size/Slim Hole||outside diameter mm||coupling Length inch||Weight per coupling KG|
|1 1/8||FS||60.33||4 1/2||1.48|