Damage by Load/Contact Patterns RCA: Typical DGBB Running Traces


Typical Running Traces of Deep Groove Ball Bearings

(A) shows the most common running trace generated when the inner ring rotates under a radial load only.

(E) through (H) show different running traces that result in a shortened life due to their adverse effect on bearings.

Inner ring rotation
Radial load









Outer ring rotation
Radial load









Inner ring or outer ring rotation
Axial load in one direction








Inner ring rotation
Radial and axial loads









Inner ring rotation
Axial load and misalignment








Inner ring rotation
Moment load (Misalignment)









Inner ring rotation
Housing bore is oval









Inner ring rotation
No radial internal clearance
(Negative operating clearance)









Source: NSK