1. Product Overview B45-108 non-standard single-row open deep groove ball bearing, dimension 45mm inner bore × 90mm outer diameter × 17mm width, also marked as HTF B45-108, fully interchangeable with original NSK B45-108 transmission bearing. Open design without rubber seals, equipped with stamped low-carbon steel cage and factory standard C0 internal clearance. It bears composite radial load and slight bidirectional axial load, runs stably and low-noise under long-term high