1. Product Overview B53-5 non-standard single-row open deep groove ball bearing, dimension 53mm inner bore × 72mm outer diameter × 10mm width, small-size special bearing for automatic transmission auxiliary shafts. Open design without rubber seals, equipped with stamped low-carbon steel cage and standard C0 internal clearance. It bears radial load and minor bidirectional axial load, runs low-noise and stable under long-term high-speed shifting vibration inside gearbox housing