Fretting
| Damage Condition | Possible Causes | Countermeasures |
| Fretting is a type of wear that is caused by relative repeated rubbing with minute amplitude between contacting surfaces. It is called fretting corrosion because of reddish brown or black wear particles that are initiated between the rubbing of contacting surfaces of balls and the raceways. |
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Fretting
Part: Fretting corrosions on a raceway of rail
Symptom: Completely dried out lubricant on the contacting area
Cause: Fretting caused by insufficient lubrication to the ball contact surfaces, due to relative repeated rubbing with minute amplitude motion (oscillation) between contacting surfaces
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