1. Product Overview B45-102 non-standard single-row open deep groove ball bearing, dimension 45mm inner bore × 90mm outer diameter × 12mm width, fully interchangeable with original NSK B45-102 transmission bearing. Open design without rubber seals, equipped with stamped low-carbon steel cage and factory standard C0 internal clearance. It bears radial load and slight bidirectional axial load, operates stably and low-noise under long-term high-speed variable vibration and high