2-Bolt bearing covers or bearing caps are for covering most 2-bolt flanged bearings. All 2-bolt bearing covers have clearance for grease fittings. These covers are universal and fit over the entire housing of the bearing. Although they have been modeled after certain bearing brands, they are not brand specific. 2-Bolt bearing covers are usually fastened to the structure the bearing is attached to by the flange, drilling two holes in the flange and the underlying structure.