• Miniature ball bearing with smallest dimensions
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• Suitable for high radial loads and light axial loads in both directions
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• Suitable for high running accuracy, quiet running, and very high speeds
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• Seal: contact lip cover on both sides made of metal (ZZ) for high sealing effect
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• 685 bearing has good fixed bearing property, but can also be used as a floating bearing, each in both directions

About 40% of the failures of ball miniature bearings are caused by dust, dirt, debris contamination, and corrosion.

Pollution is usually caused by incorrect use and poor use environment. Therefore, it can also cause torque and noise problems. However, miniature bearing failure caused by environment and pollution can be prevented. And the cause of such failure can be determined through simple visual observation.

As long as the use and installation are reasonable, the erosion of miniature bearings is easy to avoid. Therefore, the feature of erosion is that there are indentations on the raceway of the miniature bearing ring caused by impact load or incorrect installation. Erosion usually occurs when the load exceeds the yield limit of the material.

If the installation is not correct so that a certain load traverses the miniature bearing ring, corrosion will also occur. The pressure pits on the miniature bearing ring can also generate noise, vibration, and additional torque.