30RUSS4C/40 Nachi Bearing 30mm x 47mm x 20mm Made in Japan 30RUSS4C/40 Nachi Bearing, Made in Japan. the 30RUSS4C/40 inner diameter is 30mm, the 30RUSS4C/40 outer diameter is 47mm, 30RUSS4C/40 width is 20mm.