sucker rod coupling, rod joint, API 11b coupling class SM, T, UUS, full size& ... line, claa T, SM, UUS, including sucker rod coupling, subcoupling, polished rod coupling,CROSS OVER coupling. Spraying Metal coupling combines top quality steel ... API Coupling, class SM, for Connecting two sizes of sucker rod 1)Material: seamless alloy steel 2)Standard: API Spec 11B ...