SKF supplies the most popular sizes of stainless steel deep groove ball bearings capped with a seal or shield on both sides. Selection guidelines for different sealing solutions under various operating conditions are listed in table 1. However, these guidelines cannot substitute for testing a seal in its application. For additional information, refer to Sealing solutions.
When capped 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.
Bearings capped 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.
SKF does not recommend heating capped bearings above 80 °C (175 °F). However, if higher temperatures are necessary, make sure that the temperature does not exceed the permissible temperature of either the seal or grease, whichever is lowest.
The seals, which are fitted in a recess on the outer ring, make good, positive contact with the recess, without deforming the outer ring.