Under a certain load, the number of ratations or hours the bearing experiences before pitting corrosion is called the bearing life.

The life of the rolling bearing is defined by the number of ratation (or the number of hours of operation at a certain speed): the bearing within this life should have initial fatigue damage  on any of its bearing rings or rolling elements. However, whether it is in laboratory tests or using in equipment, it can be clearly seen that the appearance of the same bearing under the same working conditions, the actual life is very different.

 In addition, there are several different definitions of bearing "life", one of which is the so-called "working life", which means that the actual life that a bearing can achieve before it is damaged is wear and damage is usually not caused by fatigue, but rather caused by wear, corrosion, seal damage, etc.

In order to determine the standard of bearing life, the bearing life is related to reliability.

Due to the difference in manufacturing accuracy and material uniformity, even if the same batch of bearings of the same material and the same size are used under the same working conditions, their service life is different. If the statistical life is 1 unit, the longest relative life is 4 units, the shortest is 0.1-0.2 units, and the ratio of the longest to the shortest life is 20-40 times. 90% of the bearings do not produce pitting corrosion, and the number of revolutions or hours experienced is called the bearing rated life.

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