SKF - Rolling Bearings

Designs and variants
solid contaminants and moisture and retain
the lubricant in the bearing.
Sealed needle roller bearings with machined rings
Needle roller bearings with machined rings in
the (R)NA 49 series are available with a contact
seal († fig. 41) on one or both sides. The
NBR seals are effective at keeping the lubricant
in and contaminants out of the bearing.
The inner ring of sealed bearings is 1 mm
wider than the outer ring. This maintains the
effectiveness of the seals and simplifies the
bearing arrangements even when small axial
displacements occur.
6
Warning
Seals made of FKM (fluoro rubber)
exposed to an open flame or temperatures
above 300 °C (570 °F) are a health
and environmental hazard! They remain
dangerous even after they have cooled.
Read and follow the safety precautions
under Seal materials († page 155).
Fig. 41
NA 49 .. RS
NA 49 ...2RS
697