Rods (Sucker Rods) : A special steel rod, a number of which are screed together to make up the mechanical link from the surface pumping unit to the pump in the well. (RP 54)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}