Wear

When electric current passes through a bearing, arcing and burning occur through the thin oil film at points of contact between the raceway and rolling elements. >>

Straight line scratches on surface of raceways or rolling elements caused during mounting or dismounting of bearing. >>

Dull or cloudy spots appear on surface along with light Wear. From such dull spots, tiny Cracks are generated downward to a depth of 5-10 ｵm. Small particles fall off and minor Flaking occurs widely. >>

Smearing is surface damage which occurs from a collection of small seizures between bearing components caused by oil film rupture and/or sliding. >>