NSK Deep Groove Ball Bearings 6028ZZ ,Single Row D=140 Impact Socket Set Long Notch cuts Riveter Accordion Notch cuts 5mm Accuracy ±5µm Measuring force 0 due to contact seal Speed capability Good Good Limited by contact seals Grease sealing effectiveness Good Better than ZZ type Slightly better than VV type Dust resistance Good Better than ZZ type (usable in moderately dusty environments) Best (usable even in very dusty environments) Water resistance Not suitable Not suitable Good (usable even if fluid is splashed on bearing) Operating temperature –10 to +110 °C –10 to +110 °C –10 to +110 °C Note (1) The above temperature range applies to standard bearings 9 : 19 Series