Question: 5. Why high hardness is necessary property for the material of rolling contact bearings? 6. What is the major mechanism which decides the lifetime

5. Why high hardness is necessary property for the material of rolling

5. Why high hardness is necessary property for the material of rolling contact bearings? 6. What is the major mechanism which decides the lifetime of rolling bearings? 7. What are possible causes when a rolling bearing got failure before its designed lifetime?

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