Rubber seating rings "cushion" insert bearings in pressed steel pillow block housings (fig. 1). This helps dampen vibration and noise, and enables these bearings to be displaced slightly in their housings so that minor shaft expansion or misalignment can be accommmodated. They can be fitted on all SKF insert bearings, except for those with a standard inner ring (17262 and 17263 series).
Rubber seating rings are made of NBR and can withstand temperatures ranging from –30 to +100 °C (–20 to +210 °F).