The NKE RNA4909 is a high-quality, genuine NKE needle roller bearing without an inner ring, engineered for applications requiring high radial load capacity within a compact design envelope. With a bore diameter of 55 mm, an outer diameter of 72 mm, and a width of 20 mm, this bearing is ideal for machinery where the shaft can be hardened and ground to serve as the raceway. It offers robust performance and durability in demanding agricultural, construction, and industrial equipment.