SKF 61904-2RS1 Rubber Sealed Thin Section Deep Groove Ball Bearing 20x37x9mm

Equivalent to 6904-2RS1 

The SKF 61904-2RS1 sealed thin-section deep groove ball bearing is engineered for rotating assemblies where a 20mm shaft must fit inside a restricted bearing housing. Its 619 series geometry offers a useful compromise between the exceptionally slim 61804 and the larger 6004 bearing, giving designers additional load capacity without significantly increasing assembly dimensions. The single row ball construction accommodates radial loads and moderate axial forces in either direction, subject to the bearing's rated capacity. SKF catalogue data specifies a basic dynamic load rating of 6.37kN, a basic static load rating of 3.65kN and a limiting speed of 12,000rpm. These figures are relevant when evaluating compact drives, rotating rollers and lightly loaded transmission components.

The 2RS1 rubber contact seals retain factory grease and help restrict dust, dirt and moisture from entering the bearing. This arrangement is useful for enclosed mechanisms where regular relubrication would be inconvenient. Contact seals introduce additional friction compared with open bearings, so running temperature and rotational speed should be assessed together. Normal radial internal clearance requires careful consideration of shaft interference fits, housing tolerances and thermal expansion. The relatively thin bearing rings also benefit from accurate seating surfaces and mounting forces applied to the appropriate ring. When replacing an existing bearing, match the full designation and dimensions rather than choosing an alternative solely by its bore diameter.

Typical Applications:

Compact electric motor and drive assemblies

Industrial guide rollers and handling equipment

Precision rotary positioning mechanisms

Small pumps and ventilation equipment

Space-restricted automation and transmission systems