Purpose-built for mechanical assemblies requiring robust contamination exclusion without adding excessive weight or bulk to the housing, the 6902-2RS is a premium slim-profile deep groove ball bearing. Equipped with dual synthetic rubber contact seals (2RS), it offers superior protection against water spray, moisture, and fine particulate matter while securely locking in the factory-engineered grease. Because these heavy-duty rubber seals form a positive contact barrier with the inner ring, the 6902-2RS is exceptionally well-suited for environments exposed to outdoor elements, making it the top configuration for 15mm shaft assemblies, including bicycle wheel hubs, industrial electric motors, and outdoor automation systems.