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(1), factors affecting the fatigue life of EDA bearing very much, not all be estimated or by standard test conditions and to eliminate them, this has caused the discreteness of great practical fatigue life of bearing, so the expression parameters of bearing fatigue life is rated life of L10, in the ISO recommendation standard R281 of L10 meaning clear the following:
"The number of enough the same batch of bearing, the rated life of L10 use Revolution (or at a constant engine speed when expressed in hours, the number of bearing 90% can reach or exceed the speed in the fatigue spalling occurred before (or hours)". So far, all countries in the world to comply with the above provisions.

Width:388 mm
Bore diameter:600 mm
Outside diameter:1090 mm
Source:Product catalog 
Limiting speed:400 r/min
Reference speed:260 r/min

In some countries USA etc., use the concept of median life. The median life LM refers to a group of the same INA bearing fatigue life, namely the 50% bearings in before fatigue spalling can reach or exceed the total revolution, or at a certain speed work from time to time, median life LM not a number of bearing life of the arithmetic mean value. General median life LM is about 5 times of the rated life.
(2), the concept of life ratings apply only to a sufficient number of a batch of bearing, but not for the individual bearing.
For example, there are 40 sets of 6204 bearing according to its use just the rated life of 1000h and not cause fatigue failure, 4 sets of others may not to 1000h appears bearing fatigue failure, rated fatigue life significance on behalf of the group of INA bearings in normal play to their potential of materials can be expected life. Therefore, in most cases, the user in the selection of INA bearing is first for the fatigue life calculation, according to the actual failure category checked, such as wear life check, small calculation results in the value of bearing life calculation.