Usually under certain load, SKF bearings experienced revolution or hours before appeared corrosive pitting is called bearing life.Due to the differences of manufacturing precision, material evenness, the theirs service life can not be the same though under the same working conditions.

If take 1 as unit to calculate life, the longest relative life is of 4 units, the short be for 0.1-0.2 units, so the rate of longest and the shortest life is 20-40 times.

Calculation of SKF bearing dynamic load rating

To compare SKF bearing pitting corrosion resistance capacity, comparison of resistance to pitting corrosion for SKF bearing capacity, People stipulate that when the bearing rated life is one million turn （106）, the the maximum load the bearing can bear is the basic dynamic load rating,  expressed in C.It means under dynamic load rating C action, SKF beaing can work one million RPM ( 106) without occurrence of pitting failure, the reliability is90%. And the higher the C is, the larger the load capability will be.

The fast way to calculate SKF imported bearing life is to record rotational frequency or hours clearly before pitting corrosion occurred.This calculation method is the most accurate way.