40 mm FAG Ball Bearing Bearing Type Self Aligning Ball Bearing Number of Rows Single Row Bore Diameter (mm) 40mm Application Industrial Weight Depending upon the size of the bearing A 40mm FAG ball bearing typically refers to a deep groove ball bearing with a 40mm inner diameter. FAG, now part of Schaeffler, is a manufacturer of precision bearings. These bearings are designed for various mechanical applications and are known for their reliability and performance.