1, SKF bearing life under certain loads, flange bearings in the event before pitting or turn into hours of experience, known as the service life of the bearing.
　　Because manufacturing precision, uniformity of the material differences, even if it is the same material, same bearings of the same size, used under the same conditions of work, their life expectancy is not the same. If the statistical life expectancy of 1 unit, the longest life expectancy of 4 units, the shortest is 0.1-0.2 units, ratio between longest and shortest lifespan for the 20-40 times.
　　To determine the standards of flange bearing life, link the SKF bearing life and reliability.
　　2, the rated life of the same specifications (model, materials, process) a group of bearings, used under the same conditions of work, 90% bearings are not pitting, or turn into hours of experience is called bearing rating life.
　　3, the basic dynamic load ratings for flanged bearings pitting corrosion resistance of bearing capacity, SKF bearings under the rated life of 1 million cycles (106), it is able to withstand the maximum load for the basic dynamic load rating, expressed in c.
　　That flange bearings under dynamic load rating c, this bearing 1 million (106) without pitting failure higher the greater the reliability 90%,C bearing capacity.
　　For the basic dynamic load rating 1) radial spherical plain bearings is purely radial load 2) thrust ball bearings is purely axial load 3) radial spherical plain thrust bearings is purely radial displacement radial component



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