NA4903 Needle Roller Bearing 17×30×13mm With Inner Ring for Compact Space Machinery Product Overview NA4903 is machined ring needle roller bearing equipped with solid inner ring. Made of GCr15 bearing steel, this open type bearing features thin needle rollers, offering high radial load capacity within a compact radial space. It is suitable for limited installation space and widely used in compact transmission machinery. *Need a quick quote? Just send us your bearing model &