Gearbox bearings need to be reliable, long-life, compact but high load capacity, low friction and noise, such as planetary gearbox, worma gearbox etc.
The gearboxes are widely used in mechanical transmission, wind turbines, and also used in agricultural, industrial, construction and automotive.
For gearbox ball bearing models, you can check the following links:
Miniature Metric Bearings
Miniatrue Inch Bearings
Single Row Deep Groove Ball Bearing 6000/6200/6300 series
Thin Section Ball Bearings 6800/6900 series