Fretting
| Damage Condition | Possible Causes | Countermeasures |
| Wear occurs due to repeated sliding between the two surfaces. Fretting occurs at fitting surface and also at contact area between raceway ring and rolling elements. Fretting corrosion is another term used to describe the reddish brown or black worn particles. |
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Fretting 1
Part: Inner ring of a deep groove ball bearing
Symptom: Fretting on the bore surface
Cause: Vibration
Fretting 2
Part: Inner ring of an angular contact ball bearing
Symptom: Fretting over entire circumference of bore surface
Cause: Insufficient interference fit
Fretting 3
Part: Outer ring of a double-row cylindrical roller bearing
Symptom: Fretting on the raceway surface at roller pitch intervals
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