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Sucker rod couplings, polished rod couplingsand sub-couplings may be manufactured as Class T (through-hardened) or Class SM (sprayed metal)
Sucker Rod Couplings
Sucker rod couplings have the same box thread size in each end and are used for connecting sucker rods and pony rods, and /or sinker bars with sucker rod threads.
Polished Rod Couplings
Polished rod couplings have the same box thread size in each end and are used for connecting the polished rod and sinker bars with polished rod threads to the sucker rod string.
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.