Nodes supplies the single row deep groove ball bearings with filling slots shielded on one or both sides. Details regarding the suitability of shields under various operating conditions are listed in table below.
| Requirement | Shields |
Non-contact seals |
Low-friction seals |
Contact seals | |
| Z, ZS | RZ, TS | RSL, TS | RSH | RS1 | |
| Low friction | +++ | +++ | ++ | O | O |
| High speed | +++ | +++ | +++ | O | O |
| Grease retention | O | + | +++ | +++ | ++ |
| Dust exclusion | O | + | ++ | +++ | +++ |
| Water exclusion | |||||
| static | – | – | O | +++ | ++ |
| dynamic | – | – | O | + | + |
| high pressure | – | – | O | +++ | O |
Symbols:
+++ = best
++ = very good
+ = good
O = fair
– = not recommended
When shielded bearings must operate under certain extreme conditions, such as very high speeds or high temperatures, grease may leak at the inner ring. For bearing arrangements where this would be detrimental, special design steps must be undertaken. For additional information, contact the SKF application engineering service.
SKF bearings shielded on both sides are lubricated for the life of the bearing and should not be washed or relubricated. They are filled with the appropriate amount of a high-quality grease under clean conditions. The bearings are considered virtually maintenance-free. If they are to be hot mounted, an induction heater should be used.
Shields
SKF bearings with shields are primarily intended for applications where the inner ring rotates. Shields are fitted in the outer ring and do not make contact with the inner ring, but form a narrow gap with it. Shields are made of sheet steel.
Shields for SKF single row deep groove ball bearings with filling slots are identified by the designation suffix Z.
Greases for shielded bearings
Grease life for shielded bearings should be estimated according to the procedure described in this section. The grease life for shielded bearings is presented as L10, i.e. the time period at the end of which 90% of the bearings are still reliably lubricated.
