... 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 ... drive for the well pump, and is connected to the downhole pump at the bottom of the ... and yield strength, good toughness, it is applicable to non-corrosion or light corrosion environment.Technical Parameters ...