Sealed drawn cup needle roller bearings

For applications where a sufficiently efficient seal is not available, or cannot be used for space reasons, drawn cup needle roller bearings can also be supplied with integral lip seals as follows:
  • Drawn cup needle roller bearings with open ends, sealed on one side, designation suffix RS (fig 1), available for shaft diameters ranging from 8 mm to 50 mm.
  • Drawn cup needle roller bearings with open ends, sealed on both sides, designation suffix .2RS (fig 2), available for shaft diameters ranging from 8 mm to 50 mm.
  • Sealed drawn cup needle roller bearings with a closed end, designation suffix RS (fig 3), 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 cost-effective solution to exclude solid contaminants and moisture and retain the lubricant in the bearing. The permissible operating temperature range for sealed bearings is –30 to +100 °C.

Initial grease fill and relubrication

Sealed drawn cup needle roller bearings are initially filled with high-quality grease that has good corrosion inhibiting properties. The most important technical specifications for this grease are listed in the table. 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. Characteristics of this standard grease are listed in the table.
For additional information, refer to the section Grease lubrication.