Cracks
| Damage Condition | Possible Causes | Countermeasures |
| Cracks in the raceway ring and rolling elements. Continued use under this condition leads to larger Cracks or Fractures. |
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Cracks 1
Part: Outer ring of a double-row cylindrical roller bearing
Symptom: Thermal cracks occur on the outer ring side face
Cause: Abnormal heat generation due to contact sliding
Cracks 2
Part: Roller of a tapered roller thrust bearing
Symptom: Thermal cracks occur at large end face of roller
Cause: Heat generation due to sliding with the inner ring rib under poor lubrication
Cracks 3
Part: Outer ring of a double-row cylindrical roller bearing
Symptoms: Cracks propagated outward in the axial and circumferential directions from the Flaking origin on the raceway surface
Cause: Flaking from a flaw due to shock
Cracks 4
Part: Outer ring of a double-row cylindrical roller bearing used for outer ring rolling (Outer ring rotation)
Symptom: Cracks on outside surface
Cause: Flat Wear and heat generation due to non-rotation of the outer ring
Cracks 5
Part: Raceway surface of outer ring of damage “Cracks 4”
Symptom: Outside surface crack propagating to the raceway
Cracks 6
Part: Inner ring of a spherical roller bearing
Symptom: Axial Cracks on raceway surface
Cause: Large fitting stress due to temperature difference between shaft and inner ring
Cracks 7
Part: Cross section of cracked inner ring of damage “Cracks 6”
Symptom: Origin is directly beneath the raceway surface
Cracks 8
Part: Roller of a spherical roller bearing
Symptom: Axial Cracks on rolling surface
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