This standard specifies the boundary dimensions of deep groove ball bearings with boundary dimension meeting GB 273.3 "Rolling Bearings-Radial Bearings-Boundary Dimensions", deep groove ball bearings with snap ring groove on outer rings, deep groove ball bearings with dust cap and deep groove ball bearings with seal ring.
This standard is applicable to deep groove ball bearings and deep groove ball bearings with snap ring groove on outer rings as well as deep groove ball bearings with dust cap and seal ring.