21306EXW33K Nachi Spherical Roller Bearing Steel Cage : Tapered Bore Made in Japan 21306EXW33K Nachi Spherical Roller Bearing, Steel Cage, the bearing has a tapered inner ring bore (K), Made in Japan, the 21306EXW33K inner diameter is 30mm, the 21306EXW33K outer diameter is 72mm and the 21306EXW33K width is 19mm.