The repeated wear tests between a ferromagnetic pin and a paramagnetic rotor indicate that the abrasive action of the wear particles attracted to the pin by magnetic force increases the wear amount of the rotor when the difference in micro-Vickers hardness between the wear particles and the rubbing surface of rotor exceeds 100. Furthermore, the pin magnetized by AC current for a virgin surface increases wear.Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in San Francisco, California, October 13–17, 1996