21309EXW33K Nachi Spherical Roller Bearing Steel Cage : Tapered Bore Made in Japan 21309EXW33K Nachi Spherical Roller Bearing, Steel Cage, the bearing has a tapered inner ring bore (K), Made in Japan, the 21309EXW33K inner diameter is 45mm, the 21309EXW33K outer diameter is 100mm and the 21309EXW33K width is 25mm.