305215 Non-Standard Ball Bearing ID 30mm OD 52mm Width 15mm305215 Non Standard Sealed Ball Bearing 30mm ID 52mm OD 15mm Wide The 305215 is a sealed, non standard deep groove ball bearing designed for applications that dont follow standard bearing dimensions. Built from durable chrome steel and pre sealed to keep out contaminants, its a solid pick for custom machinery and unique mechanical setups. Type: Non standard deep groove ball bearing Inside diameter: 30mm Outside diameter: 52mm Width: 15mm Material: