Self-aligning ball bearings have two rows of balls and a common sphered raceway in the outer ring.Sealed bearings have a contact seal on both sides that is made of oil and wear-resistant NBR and reinforced with a sheet steel insert(designation suffix 2RS).We can supply different cage type , such as Stamped steel,PA66 glass fibre reinforced and Machined brass . These type bearings are widely used in paper industry,Gear Box ,Spinning machine, plastic machinery, medical equipment and all kinds of industrial machinery. If you want to know more about WSBC 2307K-2RS Sealed self-aligning ball bearings , welcome you contact us freely .