Load Ratings and Life Calculations 

General Notes About Bearing Life
NMB Ball Bearings are used in a wide variety of applications. Many contain several application and environmental variables, all of which have an influence on bearing performance and life. Therefore it is extremely important to select the correct Bearing for each application in order to obtain the best possible results. These values are calculated according to JIS Specs as follows:

Basic Life Rating
The Basic Life Rating (L10) is defined in specification JIS B1518 "Dynamic load ratings and rating life for rolling bearings" as follows:

The Basic Life Rating is the life obtained with 90% reliability, when an individual bearing or an identical group of bearings are manufactured with common materials, common manufacturing processes and quality, and operate under the same conventional conditions. L10 Life is the accumulated rotation where 90% of survive without material flaking when they are operated under fixed conditions, of a population of bearings.

		: Basic Life Rating in millions of revolutions
		: Basic Dynamic Load Rating
		: Equivalent Dynamic Radial Load Factor

There is a relationship between the Basic Life Rating (revolutions) and Basic Life (time).

Dynamic Equivalent Radial Load Factor (Pr)
The Dynamic Equivalent Radial Load Factor is defined as "the direction and magnitude to the bearing, which is able to obtain the same life under the actual load and rotation conditions".
From the calculation formula and the table below, the axial and the radial loads are replaced by the Dynamic Equivalent Radial Load Factor (Pr).

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