Shielded (2Z) bearings are fitted with two metal dust shields to prevent the ingress of dirt and foreign matter. 2RZ bearings are 2Z bearings fitted with two low friction seals.
Deep Groove Metric Ball Bearings - Shielded SKF shielded deep groove ball bearings are versatile ball bearings that suit high and very high speeds, they will accommodate both radial load and axial load in both directions. The ball bearings need very little maintenance. SKF deep groove ball bearings come in a range of different sizes. This range is single row ball bearings. More info
Deep Groove Metric Ball Bearings - Shielded SKF shielded deep groove ball bearings are versatile ball bearings that suit high and very high speeds, they will accommodate both radial load and axial load in both directions. The ball bearings need very little maintenance. SKF deep groove ball bearings come in a range of different sizes. This range is single row ball bearings.