6203-2NSENR Nachi Bearing With Snap Ring (C clip) 17mm x 40mm x 12mm Made in Japan 6203-2NSENR Nachi Bearing with a Snap Ring, the 6203-2NSENR inner diameter is 17mm, the 6203-2NSENR outer diameter is 40mm, 6203-2NSENR width is 12mm.