NN3006 Nachi Cylindrical Roller Bearing 30mm x 55mm x 19mm Bronze Cage : Tapered Bore Made in Japan NN3006 Nachi Cylindrical Roller Bearings, Steel Cage, Made in Japan, the NN3006 inner diameter is 25mm, the NN3006 outer diameter is 47mm, NN3006 width is 16mm.