23138EW33K Nachi Spherical Roller Bearing Bronze Cage : Tapered Bore Made in Japan 23138EW33K Nachi Spherical Roller Bearings, Bronze Cage, the bearing has a tapered inner ring bore (K), Made in Japan, the 23138EW33K inner diameter is 190mm, the 23138EW33K outer diameter is 320mm and the 23138EW33K width is 104mm.