Mood 3 Products


Damage ConditionPossible CausesCountermeasures
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.
  • Poor lubrication
  • Vibration with a small amplitude
  • Insufficient interference
  • Use a proper lubricant
  • Apply a preload
  • Check the interference fit
  • Apply a film of lubricant to the fitting surface

Click a photo to enlarge it

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