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Equivalent to 6903-2RS
The SKF 61903-2RS1 sealed thin-section deep groove ball bearing provides rotational support where a 17mm shaft must fit within a compact mechanical assembly. Its 619 series geometry offers more radial section than the exceptionally slim 61803 design while remaining narrower than a standard 6003 bearing. The single row ball arrangement 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 4.62kN, a basic static load rating of 2.55kN and a limiting speed of 14,000rpm. These values help engineers assess suitability for small drive systems, precision rotary mechanisms and lightly loaded industrial rollers.
The 2RS1 rubber contact seals provide protection on both sides of the bearing, helping retain factory grease and restrict contamination without requiring frequent relubrication. This is useful in enclosed mechanisms where lubrication access is limited. Contact seals create additional friction compared with open or non-contact sealed bearings, so continuous running speed and temperature should be considered together. Normal radial internal clearance requires appropriately selected shaft and housing fits, especially where interference or temperature differences affect the installed clearance. Accurate alignment and mounting forces applied to the correct ring help protect the raceways during installation. When replacing an existing bearing, confirm the complete designation, including its sealing and clearance specification.
Typical Applications:
Compact electric motor and drive assemblies
Precision rotary positioning mechanisms
Industrial guide rollers and handling equipment
Small ventilation and circulation mechanisms
Space-restricted automation and transmission systems
