40mm Bearing UCF208 Black Oxide Plated Insert Bearing + Square Flanged Housing Mounted BearingUCF208 Black Oxide Plated Insert Bearing + Square Flanged Housing 40mm Mounted Bearing One Bearing UCF208 40mm Black Oxide plated Insert Mounted Bearing, the inner diameter is 40mm. Black oxide has certain properties and characteristics that makes it ideal for certain applications. It is used to add corrosion resistance and for appearance. Item: UCF208 Black Bearing Type: Mounted Bearings Bolt Size: M12 Shaft Diameter: 40mm Basic Load (Cr): 29,100 N