Electric motors, generators, and associated equipment are at risk when an electric current passes through their bearings. This can damage the contact surfaces of rolling elements and raceways in the bearings (electrical erosion) and rapidly degrade the grease. An additional risk in electric motors and generators comes from high-frequency currents caused by the inherent stray capacitance. The risk of damage increases where the application uses a frequency converter.

SKF Insulated bearings are a type of bearing designed to protect against electrical current damage. These bearings are used in applications where there is a risk of electrical current passing through the bearing and causing damage to the rolling elements, raceways, and lubricant.

SKF INSOCOAT bearings have a coating on the outer ring that provides insulation against electrical current. INSOCOAT bearings are available in a variety of sizes and designs, including deep groove ball bearings, cylindrical roller bearings, and spherical roller bearings. The external surfaces of either their inner or outer ring are coated with an insulating aluminum oxide layer, by applying a sophisticated plasma-spray process for an outstanding quality finish. The solutions are very cost-effective compared with other insulation methods.

SKF-insulated bearings are commonly used in applications such as electric motors, generators, and other electrical equipment. They help prevent electrical damage and increase bearing life, reducing the need for costly repairs and downtime.