For applications where a sufficiently efficient seal is not available, or cannot be used for space reasons, SKF drawn cup needle roller bearings can also be supplied with integral lip seals. These include:
- SKF drawn cup needle roller bearings with open ends, sealed on one side, designation suffix RS, available for shaft diameters ranging from 8 mm to 50 mm
- SKF drawn cup needle roller bearings with open ends, sealed on both sides, designation suffix .2RS, available for shaft diameters ranging from 8 mm to 50 mm.
- SKF sealed drawn cup needle roller bearings with a closed end, designation suffix RS, available for shaft diameters ranging from 10 mm to 25 mm.
The integral seals are contact seals made of polyurethane (AU), fluoro rubber (FKM) or acrylonitrile-butadiene rubber (NBR). The use of a sealed drawn cup needle roller bearing is, under normal conditions, an extremely costeffective solution to exclude solid contaminants and moisture and retain the lubricant in the bearing. The permissible operating temperature range for SKF sealed bearings is –30 to +100 °C.
Initial grease fill and relubrication
SKF sealed drawn cup needle roller bearings are filled at the factory with a high-quality grease that has good corrosion inhibiting properties. The relatively large quantity of grease in the bearings means they can be operated for long periods before relubrication is required. SKF recommends using SKF LGWA 2 grease for relubrication.
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