NN3021M2KC1NA P4 Nachi Cylindrical Roller Bearing Bronze Cage : Tapered Bore 105mm x 160mm x 41mm Made in Japan NN3021M2KC1NA P4 Nachi Cylindrical Roller Bearings, Steel Cage, Made in Japan, the NN3021M2KC1NA P4 inner diameter is 105mm, the NN3021M2KC1NA P4 outer diameter is 160mm, NN3021M2KC1NA P4 width is 41mm.