1. Type N0000 cylindrical roller bearings (outer ring without flange) and type NU0000 cylindrical roller bearings (inner ring without flange): These bearings can withstand large radial loads, have high limiting speeds, do not restrict axial displacement of the shaft or housing, but cannot withstand axial loads.
2. Cylindrical roller bearings with flanges on both the inner and outer rings (types NJ0000 and NF0000): These bearings can restrict axial displacement of the shaft or housing in one direction and can withstand small unidirectional axial loads. Types NU0000+HJ0000, NJ0000+HJ0000, and NUP0000 bearings can restrict axial displacement of the shaft or housing in both directions within the axial clearance range of the imported bearing and can withstand small bidirectional axial loads.