Min. Order:  
100Nos
                 Price:  
USD 1.8
                 Place of origin:  
China
                 Price Condition:  
FOB Qingdao
                 Supply Ability:  
1000000 nos per year
                 
            Coupling ,sub-coupling ,polished rod coupling are designed in accordance with API SPEC 11B and made of fine carbon-steel or alloy steel(equivalent to AISI 1526 or AISI 4135).
Normally, they have two wrenches one the outside diameter but they also can be providing in no wrench when required by user. 
Standard of API Spec 11 b and SY/T5029-2006 , main specifications: 5/8/3/4 (SM), 3/4/7/8 T (SM), 7
                [Related Keywords : Sucker Rod, Coupling, Sucker Rod Coupling]