The non-separable, self-aligning unit is built of an inner ring, needle rollers, outer ring with spherical O.D. retaining washers and housing ring with spherical I.D. The end washers are fastened to the inner ring. Type NBE includes single row of rollers while type NBK includes two rows of rollers. Type NBK bearing features lubrication grooves and holes in the inner ring, outer ring and housing ring. The type NBE bearing also features similar design except groove and holes in the inner ring are omitted. The self-aligning bearing outer ring and its housing ring are a matched assembly and needs to be kept together. The complete external surface except the inner ring bore, are cadmium or zinc-nickel plated.