23120EX1K Nachi Spherical Roller Bearing Bronze Cage : Tapered Bore Made in Japan 23120EX1K Nachi Spherical Roller Bearings, Bronze Cage, the bearing has a tapered inner ring bore (K), Made in Japan, the 23120EX1K inner diameter is 100mm, the 23120EX1K outer diameter is 165mm and the 23120EX1K width is 52mm.