23228E1W33K Nachi Spherical Roller Bearing Bronze Cage : Tapered Bore Made in Japan 23228E1W33K Nachi Spherical Roller Bearings, Bronze Cage, the bearing has a tapered inner ring bore (K), Made in Japan, the 23228E1W33K inner diameter is 180mm, the 23228E1W33K outer diameter is 250mm and the 23228E1W33K width is 88mm.