Two types of coupling are available: Class T and Class SM, full size and slim size. It conform to API spec 11B

Two types of coupling are available:

 Class T and Class SM(spray metal rod coupling), full size and slim size.  Dimensions and tolerance conform to API spec. 11 B.  Couplings are available in a variety of styles in most sucker rod sizes and combination of sizes. 

The minimum tensile strength of the coupling is 95,000 psi (655MPa) and the material hardness is 56 to 62 HRA

We also provide Sub-coupling: 5/8-3/4 T(SM), 3/4-7/8T(SM), 7/8-1T(SM), 1-1 1/8 T(SM).

sucker rod coupling