... timeDetail describe:1) Bearing series: 1200 series, 1300 series, 2200 series, 2300 series2) Material of rings and balls : chrome steel; ... and machines 1) Bearing series: 1200 series, 1300 series, 2200 series, 2300 series2) Material of rings and balls : chrome steel; ... electrical household, electrical tools and machines Self-aligning ball bearing photo: Self-aligning ball bearingIf it is the first ...