This needle roller bearing guides a track along a fixed axis, combining a thick-walled outer ring with a needle roller and cage assembly and an inner ring. Bore diameter is 50.0 mm, outside diameter 90.0 mm, and net mass is 0.924 kg. Axial guidance of the outer ring is provided by plastic axial plain washers together with contact washers. Sealing is achieved in three stages through plastic axial plain washers fitted on both sides, marked PP in the symbol NATR50-PP-A. This arrangement keeps contamination away from the needle roller set while maintaining axial positioning of the outer ring without additional guiding elements. The construction suits applications where a cam or track surface runs directly against the outer ring, and the built-in sealing reduces the need for external protective covers.