1. Product Overview B39Z-10 non-standard single-row open deep groove ball bearing, dimension 39mm inner bore × 66mm outer diameter × 10mm narrow width, suffix Z represents ultra-smooth optimized internal raceway for low friction high-speed operation, fully interchangeable with original NSK B39Z-10, matched to Toyota K310/K313 series CVT small control auxiliary shafts. Open design without rubber seals, equipped with stamped low-carbon steel cage and factory standard C0