L10 lifeof bearing SKF

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What is L10? The L10 life is the number of revolutions or hours that 90% of a group of apparently identical bearings will complete or exceed before fatigue is expected to occur. In other words, 10% of the group is not expected to achieve the L10 life. The rating life can be calculated in terms of millions of revolutions or hours by using the bearing

L10 lifechart

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The basic load rating is a reference value only, to be used for selection of an adequately sized bearing to provide the desired L10 life in a given application. The L10 rating standard was originally established by the ABMA – American Bearing Manufacturers Association. Based on years of analysis very few bearings actually fail because of “fatigue.” The cause is usually another factor, such as lubricant failure or contamination.