MRO Magazine


Electrically insulated rolling bearings

NKE offers its SQ77 electrically insulated rolling bearings, which feature a built-in electrical insulation, which provides reliable protection against current discharge and the resulting electrical corrosion. Typical applications include electric motors, generators and other electrical machines. They are available in three versions: the SQ77 series, with an oxide ceramic insulation layer on the outer ring; the SQ77E series with an insulation layer on the inner ring and the hybrid bearings of the SQ77B series which feature ceramic rolling elements with theoretically infinite insulation resistance.