Miniature deep groove ball bearings in the failure of some 40% is dust, dirt, debris and pollution caused by corrosion. Contamination is usually caused by incorrect use and adverse environments caused by it will cause the torque and noise issues. Miniature bearing failure arising from environmental and pollution can be prevented, but also through simple observation with the naked eye can determine the cause of this failure. As long as the use and installation of reasonable, erosion of miniature bearings are easy to avoid. Erosion features are left on the miniature bearing ring raceway by impact loading or incorrect installation of the indentation. Erosion is usually occurs when the load exceeds the yield limit. If it's not installed correctly so that a load across the miniature bearing ring may have eroded. Micro-indentation on the bearing rings will generate noise, vibration and additional torque.