Double row angular contact ball bearings generally use nylon cages or brass solid cages. When installing, it should be noted that although the bearing can bear bidirectional axial load, if there is a gap for ball loading on one side, care should be taken not to let the main axial load pass through the groove on the side with the gap. When the bearing is used, care should be taken to make the side raceway without the ball-loading notch bear the main load.