1. Product Overview B39-5 non-standard single-row ultra-thin open deep groove ball bearing, overall dimension 39mm inner bore × 52mm outer diameter × 5mm extra-narrow width, fully interchangeable with original NSK B39-5, specially matched for Toyota K310, K313 CVT tiny control valve and auxiliary micro shafts. Open design without rubber seals, equipped with lightweight stamped low-carbon steel cage and factory standard C0 internal clearance, C3 clearance customizable on