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SKF self-aligning ball bearings are also available in a sealed version with contact seals at both sides – designation suffix 2RS1. These sheet steel reinforced seals are made of oil and wear-resistant acrylonitrile-butadiene rubber (NBR). The permissible operating temperature range for these seals is �40 to +100 �C and up to +120 �C for brief periods. The seal lip contacts a smooth chamfer on the inner ring with light pressure.
Sealed bearings are lubricated as standard with a grease with a lithium thickener, that has good rust inhibiting properties and other characteristics according to the table.
| SKF standard grease filling for sealed self-aligning ball bearings | ||
|---|---|---|
| Technical specifications | SKF greases | |
| MT47 | MT33 | |
| Bearing outside diameter (mm) | ≤ 62 | > 62 |
| Thickener | Lithium soap | Lithium soap |
| Base oil type | Mineral oil | Mineral oil |
| NLGI consistency class | 2 | 3 |
| Temperature range (°C)1 | -30 to +110 | -30 to +120 |
| Base oil viscosity (mm2/s) | ||
| at 40 °C | 70 | 98 |
| at 100 °C | 7,3 | 9,4 |
1) For safe operating temperature, see section �Temperature range � the SKF traffic light concept�
SKF sealed self-aligning ball bearings are available with a cylindrical bore. Some sizes are also available with a tapered bore (taper 1:12).
Note
Sealed bearings are lubricated for life and require no maintenance. They should not be heated above 80 �C before mounting and should not be washed.
Deep groove ball bearings | Single row deep groove ball bearings | Basic design bearings | Sealed bearings | Bearings with shields | Bearings with low-friction seals | Bearings with contact seals | ICOS� oil sealed bearing units | Grease life | SKF Energy Efficient (E2) deep groove ball bearings | Deep groove ball bearings with filling slots | Stainless steel deep groove ball bearings | Double row deep groove ball bearings
