The sucker rod coupling have the same box thread size in each end are used for connecting sucker rod and/or pony rod, and/or sinker bars with sucker rod threads.
The polished rod coupling have the same box thread size in each end are used for connecting polished rod and/or sinker bars with polished rod threads to the sucker rod string.
The sub-coupling have different sizes of box threads in each end are used for connecting two sizes of sucker rods or a polished rod to a sucker rod string.

Name: sucker rod coupling
Material: carbon steel, stainless steel
Connection Type: Male, female
Head: thread

API Oilwell sucker rod coupling

1.Size: from 3/4" to 1" slim hole full size
2.Placement: female
3.Technics: hot rolling
4.Grade: T,SM

Full Size Coupling

Machanical Properties