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The rigidity of the bearing refers to the elastic deformation between the rolling element and the raceway contact surface under load. The small amount of deformation is called "high rigidity"; the large amount of deformation is called "low rigidity", that is, the rigidity is poor. Under normal circumstances, due to the different contact area, the deformation of the roller bearing under load is smaller than that of the ball bearing, and the former is better in rigidity.

Normal understanding, the greater the rigidity of NSK bearings, the better. Because of the poor bearing rigidity, an excessive amount of deformation will occur between the rolling element and the raceway contact surface, which will increase the bearing friction and reduce the bearing rotation accuracy. For example, under load, the amount of deformation between the rolling elements is large, and the degree of deformation is different, which will cause uneven stress on the bearing, which will cause more serious damage to the bearing.

At present, the bearing steel used for bearing production is mostly: high carbon chromium steel, with good rigidity. Among them, the amount of carbon content will directly affect the rigidity of the bearing, but whether it is high-carbon chromium steel or low-carbon chromium steel, the rigidity of the 45TAC100B bearing must meet the on-line standard. For example, the lowest rigidity standard for bearing materials is 100, and the rigidity of low-carbon chromium steel cannot be lower than this value.