Sucker rod
![The line of sucker rods is represented in this diagram by the solid black line in the center of the well](/Images/godic/202502/13/Pump_Jack_labelled5919.png")
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![](/Images/godic/202502/13/Mechanical-Properties-for-OCTG-Sucker-Rod5919.jpg")
![](/Images/godic/202502/13/Mechanical-Properties-for-Sinker-Bar5919.jpg")
A sucker rod is a steel rod, typically between 25 and 30 feet (7 to 9 meters) in length, and threaded at both ends, used in the oil industry to join together the surface and downhole components of a reciprocating piston pump installed in an oil well. The pumpjack is the visible above-ground drive for the well pump, and is connected to the downhole pump at the bottom of the well by a series of interconnected sucker rods. Sucker rods are also commonly available made of fiberglass in 37 1/2 foot lengths and diameters of 3/4, 7/8, 1, and 1 1/4 inch. These are terminated in metallic threaded ends, female at one end and male at the other.