Rating Fatigue Life Correction

Recent improvements in bearing material have greatly extended the fatigue life. In addition, the development of the Elasto-Hydrodynamic Theory of Lubrication proves that the thickness of the lubricating film in the contact zone between rings and rolling elements greatly influences bearing life. To reflect such improvements in the calculation of fatigue life, the rating fatigue life is adjusted using the following adjustment factors:

L na = a 1 a 2 a 3 L 10

where