Corrosion is a surface condition to investigate, not an instruction to clean and reuse. Record where moisture or chemicals could enter and whether damage reaches rolling contacts. A stainless bearing is not automatically suitable for every chemical, immersion condition or washdown process.
Use the illustration to locate the kind of feature being discussed, not to certify the condition of a real part.
Corrosion can affect rings and rolling elements, sometimes across a surface and sometimes at repeated contact positions.
Trace water or corrosive exposure, condensation, lubricant condition, handling and storage protection.
Colour and spacing are not conclusive. Removing staining does not restore a pitted rolling contact or establish that reuse is acceptable.
Technical basis: NSK Bearing Doctor, individual damage-type references. Original BearingScope illustrations and investigation prompts, reviewed 4 October 2026. Colour, shape and depth are illustrative; source snapshots are retained in the internal audit.
| Observation or context | Interpretation to consider | Verification needed |
|---|---|---|
| Rust after storage | Packaging and condensation history | Check whether the protective wrap was opened or damp. |
| Damage near a seal | An exposure path may exist | Record seal condition, washdown direction and drain arrangements. |
| Marks at rolling-element spacing | More than one mechanism is possible | Distinguish corrosion from vibration-related fretting with inspection evidence. |
Photograph before cleaning and record the affected surfaces. Keep the bearing orientation and exposure history with the images.
Inspect lubricant for water contamination using an appropriate analysis method. Colour alone does not quantify water content.
Check the exact seal and material specification, not only the word stainless or sealed. Document the actual chemical and temperature.
Assess the damaged bearing using the manufacturer's rejection criteria. Correct the ingress or storage condition before fitting a replacement.
Keep this checklist with your inspection or comparison. Checking a box only records that you have collected the item; it does not certify the bearing.
0 of 4 information groups recorded.
Original BearingScope workflow, written for catalogue research and comparison. Manufacturer material is used to check principles, not copied as a product endorsement or substituted for model-specific instructions. Reviewed 1 October 2026.
Source addresses and collection status are retained in the internal audit. No unpublished dimensions, torque settings, service intervals or interchange approvals are inferred.