Supplementary data to the publication "Analyzing Ball Bearing Capacitance using Single Steel Ball Bearings" by Steffen Puchtler, Julius van der Kuip and Eckhard Kirchner published in Tribology Letters by Springer. Capacitance measurements of hybrid ball bearings with a single steel rolling element were carried out. This helps to measure only one current path through the bearing at a time and thus, gives a much clearer picture of the contact capacitance of rolling elements in and out of the load zone. Provided is raw and evaluated measurement data as well as calculation results.