Fracture
| Damage Condition | Possible Causes | Countermeasures |
| Fracture refers to small pieces which were broken off due to excessive load or shock load acting locally on a roller corner or rib of a raceway ring. |
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Fracture 1
Part: Inner ring of a double-row cylindrical roller bearing
Symptom: Chipping of the center rib
Cause: Excessive load during mounting
Fracture 2
Part: Inner ring of a tapered roller bearing
Symptom: Fracture of the cone back face rib
Cause: Large shock during mounting
Fracture 3
Part: Inner ring of a spherical thrust roller bearing
Symptom: Fracture of the large rib
Cause: Repeated shock load
Fracture 4
Part: Outer ring of a solid type needle roller bearing
Symptom: Fracture of the outer ring rib
Cause: Roller inclination due to excessive loading (Needle rollers are long compared to their diameter. Under excessive or uneven loading, rollers become inclined and push against the ribs.)
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