This standard explains the reasons for different load rating coefficients when calculating the basic dynamic load ratings Cr and Ca of radial and thrust angular contact bearings, and describes the method for recalculating these rated loads, for accurate comparisons under the same conditions.
GB/T 20059-2006 history
2011GB/T 6391-2010 Rolling bearings.Dynamic load ratings and rating life
2006GB/T 20059-2006 Rolling bearings.Dynamic load rating life.Discontinuities in the calculating of basic dynamic load ratings
GB/T 20059-2006 Rolling bearings.Dynamic load rating life.Discontinuities in the calculating of basic dynamic load ratings was changed to GB/T 6391-2010 Rolling bearings.Dynamic load ratings and rating life.