Part of the bearing to move the surface material like fish scales fall off, a phenomenon known as fatigue spalling. To withstand a certain load, move bearing operation, even if it is a static load, but the balls and raceways, the stress is the reincarnation ofback and forth, and the materials will move exhausted so that the bearing to achieve life. In addition to the bearing of several different definitions of "life", one of the so-called "working life", it means that the actual life of a needle roller bearings before damage can be achieved by the wear and tear, damage is usually not caused by fatigue, but by reason of wear and tear, erosion, seal damage caused.

However, in laboratory tests or in actual use, can be significant to see the appearance of the same bearing in the same work under the premise, to differ materially from actual life.

Bearing the lifetime number of revolutions (or number of hours worked under a certain speed), the definition: needle roller bearings within this life, should occur in any of its bearing ring or move the body the initial fatigue damage (spalling or defect). The bearing of most of the pumping bad lot - beyond the original estimate of the load, non-effectively sealed tight with the result of small bearing clearance.
   
Any one of the factors of these factors have their special damage type and will leave special signs of damage. Therefore to view the damage to the bearings, its possible causes, in general, is the third of the needle bearing damage caused in the fatigue damage can be found in most of the cases, one-third caused by poor lubrication. third guide other contaminants from entering the bearing or the installation of improper handling.

However, these damage types with Industry. For example, pulp and paper industry, mostly because of poor lubrication or contamination caused by damage to the bearings and not because of material fatigue caused.
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