NN3008M2KC1NA P4 Nachi Cylindrical Roller Bearing 40mm x 68mm x 21mm Bronze Cage : Tapered Bore Made in Japan NN3008M2KC1NA P4 Nachi Cylindrical Roller Bearings, Steel Cage, Made in Japan, the NN3008M2KC1NA P4 inner diameter is 40mm, the NN3008M2KC1NA P4 outer diameter is 68mm, NN3008M2KC1NA P4 width is 21mm.