1. Product Overview B40-181 non-standard single-row open deep groove ball bearing, overall dimension 40mm inner bore × 72mm outer diameter × 17mm width, interchangeable with original NSK B40-181 and equivalent model DG407217, widely matched to Japanese passenger car CVT intermediate auxiliary shaft and small differential assemblies. Open design without rubber seals, equipped with stamped low-carbon steel cage and factory standard C0 internal clearance, C3 clearance customizab