GE-ES-2RS lubricated radial spherical plain bearings: single-slot outer ring radial spherical plain bearings, the inner and outer ring materials are bearing steel, quenched. Phosphating. The sliding surface is wear-resistant and corrosion-resistant. With the character of Self-aligning , it can be lubricated through the oil grooves of the inner and outer rings.However, there are seal rings on both sides of the bearing, which are suitable for dusty environments.