Single row deep groove ball bearings for high temperature applications are shielded on both sides and are designed for severe operating conditions, with some types capable of withstanding temperatures up to 350 °C . They have a larger radial internal clearance and use a graphite-based lubricant that can operate at high temperatures. They are lubricated for life and the entire surface of the bearing is treated with manganese phosphate, which enhances the adhesion between the lubricant and the met