Wear
| Damage Condition | Possible Causes | Countermeasures |
| Wear is surface deterioration due to sliding friction at the surface of the raceway, rolling elements, roller end faces, rib face, cage pockets, etc. |
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Wear 1
Part: Inner ring of a cylindrical roller bearing
Symptom: Many pits occur due to electrical corrosion and wave-shaped Wear on raceway surface
Cause: Electrical corrosion
Wear 2
Part: Outer ring of a spherical roller bearing
Symptom: Wear with a wavy or concave-convex texture on loaded side of raceway surface
Cause: Entry of debris under repeated vibration while stationary
Wear 3
Part: Inner ring of a double-row tapered roller bearing
Symptom: Fretting Wear of raceway and stepped Wear on the rib face
Cause: Fretting progression due to excessive load while stationary
Wear 4
Part: Tapered rollers of damage “Wear 3”
Symptom: Stepped Wear on the roller head end faces
Cause: Fretting progression due to excessive load while stationary
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