Abrasive wear
Grit in the lubricant is sanding the bearing down. Urgency
Material rubbed away: by grit, or by surfaces dragging instead of rolling.
What abrasive wear looks like
- Tracks that look matt or slightly shiny, with fine scratches running in the rolling direction
- Wear spread round the whole circumference rather than in one spot
- Cage pockets worn wider; rings may show polished creep wear on the bore or outside surface if fits are loose
Rotec AI schematic illustration. It shows the typical pattern and is not a photograph of a real bearing.
How abrasive wear develops
Hard particles (dust, grit, process material, wear debris) are dragged through the contacts and remove metal a little at a time. Wear speeds up as clearance opens and more debris is made. The bearing can run quietly for a long while while getting steadily sloppier.
How fast it progresses: Gradual. The warning signs are rising clearance, shaft play and a change in noise; the bearing often ends as surface fatigue.
Causes of abrasive wear
Environment & sealing
- Seal failure or the wrong seal type
- Contaminated grease or oil; ingress through breathers
- Dirty mounting conditions
Lubrication
- Too little lubricant, letting surfaces touch
Design & seats
- Loose fits that let a ring creep against its seat
How to confirm it is abrasive wear
- Measure internal clearance and compare with a new bearing: wear opens it
- Smear a little lubricant on paper and look at it under a light for grit
- Check the seals and the shaft and housing seats for wear marks
How to fix and prevent abrasive wear
- Upgrade sealing for the real environment and inspect it on a schedule
- Keep lubricant clean: filter, replace and relubricate on time
- Correct loose fits so rings stop creeping
- Mount in clean conditions and flush housings after any earlier failure
Easily confused with
- Surface-initiated fatigue (surface distress): Surface fatigue is dull and finely pitted; abrasive wear is scratched and worn smooth.
- Indentations from particles: Particle dents are discrete marks; abrasive wear is general, all over the track.
Other wear modes
Questions about abrasive wear
What causes abrasive wear in a bearing?
Seal failure or the wrong seal type. Too little lubricant, letting surfaces touch. Loose fits that let a ring creep against its seat.
How do you fix or prevent abrasive wear?
Upgrade sealing for the real environment and inspect it on a schedule. Keep lubricant clean: filter, replace and relubricate on time. Correct loose fits so rings stop creeping.
What does abrasive wear look like?
Tracks that look matt or slightly shiny, with fine scratches running in the rolling direction. Wear spread round the whole circumference rather than in one spot.