30mm Bearing UCF206 Black Oxide Plated Insert + Square Flanged Cast Housing Mounted BearingsUCF206 Black Oxide Plated Insert + Square Flanged housing One Bearing 30mm Mounted Bearing UCF206, the inner diameter is 30mm. 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: UCF206 Black Oxide Plated Insert Bearing + Squared Flanged housing Type: Mounted Bearings Bolt Size: M16 Basic Load (Cr): 19,500 N Basic Load (Cor): 11,300 N