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What is the dynamic load capacity C of rolling bearings and how is it calculated?

The dynamic load capacity C is the maximum load that, if applied constantly and under standardized conditions, to a rotating bearing, allows for a duration of one million revolutions.

C is calculated according to ISO 281 standard, which specifies the methods for calculating the basic dynamic load rating of rolling bearings within the dimensional ranges indicated in the relevant ISO publications. It applies to bearings manufactured with contemporary, commonly used, high-quality bearing steels, in accordance with good manufacturing practices and essentially having a conventional design with respect to the shape of the rolling contact surfaces.

ISO 281:2007 standard also specifies the methods for calculating the basic nominal life, which is the life associated with a 90% reliability level, using commonly used high-quality materials, good manufacturing quality, and conventional operating conditions. Additionally, it specifies the methods for calculating the modified nominal life, taking into account various reliabilities, lubrication conditions, contaminated lubricant, and bearing fatigue load.

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