Company recently developed a new type of sucker rod coupling, the four parts of its unique design makes it more than the previous three parts coupling longer, carrying capacity is bigger.

 

This kind of coupling used in sucker rod pump well and screw pump well, has high strength and reliability.

 

Under the same load, the standard API will along the pin shoulder collar, the junction surface and through the screw displacement, dynamic load, lead to damage of pin.

 

And the four parts of new collar design can produce stable rigid connection. Collar thread and size precision, can form the centripetal twist lock. The preload can increase the strength of the thread, in the stretch bending, torsion, and fatigue has good stability, can reduce the shoulder of male stress at the same time, and