... ,Class SM 1)Function:The sub sucker rod couplings are used to connect two varisized sucker rod.2)Basic Material:High quality ... 101.6mm) 13)Usage: oil exploration equipment, accessories, oil sucker rod couplingOthers : Payment terms and price can be charged depends ... include Class T sucker rod coupling, Class SM sucker rod coupling, Full size sucker rod coupling, slim hole sucker rod coupling,all ...