20mm Bearing UCFL204 Black Oxide Plated Insert + 2-Bolt Flanged Cast Housing Mounted Bearing20mm Black Oxide Plated Insert Mounted Bearing UCFL204 One Bearing 20mm Black Oxide Plated Insert Mounted Bearing UCFL204, measures an inner diameter of 20mm. UCFL204 Black Oxide Plated Insert Bearing + 2 bolts flanged housing. Black oxide has certain properties and characteristics that makes it ideal for certain applications. It is used to add corrosion resistance and for appearance Mounted Bearings Bolt Size: M10 Basic Load (Cr): 12,800 N Basic Load