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Due to manufacturing precision, uniformity of material differences, even if it is the same material, same bearings of the same size and in the same job under the conditions of use, and their length of life is not the same. If the statistical life expectancy of 1 unit of relative life expectancy is 4 units long, the shortest is 0.1-0.2 units, the longest and the shortest life expectancy of more than 20-40 times. 90% bearings are not pitting, revolutions or hours of experience called bearing rating life.