21317EXW33K Nachi Spherical Roller Bearing Steel Cage : Tapered Bore Made in Japan 21317EXW33K Nachi Spherical Roller Bearing, Steel Cage, the bearing has a tapered inner ring bore (K), Made in Japan, the 21317EXW33K inner diameter is 85mm, the 21317EXW33K outer diameter is 180mm and the 21317EXW33K width is 41mm.