often accompanied by fatigue cracks

Contact fatigue spalling occurs in INA bearing surface , often accompanied by fatigue cracks , first produced from the contact surface of the following maximum alternating shear stress , and then extended to the formation of different surface flaking shapes, such as point-like pitting or pitting as spalling , flaking into small pieces called superficial peeling. Due to the gradual expansion of flaking surfaces , but often extend to the deep , forming deep peeling. Deep contact fatigue double row cylindrical roller bearing  spalling is a source of fatigue failure .
Continuous wear will cause spherical roller thrust bearing parts gradually damage and eventually lead to the loss of dimensional accuracy INA bearings and other related issues . Wear may affect the shape change , with the gap increasing and work surface morphology changes that may affect the lubricant or it reaches a certain level of pollution caused complete loss of lubrication , which makes bearings and even the loss of rotational accuracy can not operate normally . Wear failure is one of the kinds of bearings common failure mode, press the wear is usually divided into the most common form of abrasive wear and adhesive wear .