SKF 635-2Z Metal Shielded Single Row Deep Groove Ball Bearing 5x19x6mm

The SKF 635-2Z shielded miniature deep groove ball bearing provides compact rotational support where a 5mm shaft must carry radial loads within a 19mm housing diameter. Its 6mm width and relatively substantial cross-section distinguish it from smaller miniature bearings such as the 625, which measures 5 x 16 x 5mm. The single row deep groove raceways accommodate radial forces together with limited axial loading in either direction, within the bearing's rated capacity. SKF catalogue data gives a basic dynamic load rating of 2.34kN and a basic static load rating of 0.95kN. These ratings help determine suitability for miniature motors, small transmission components and other continuously rotating assemblies.

The 2Z designation identifies non-contact metal shields fitted on both sides of the bearing. These shields help retain the factory grease and restrict larger particles from entering, while producing less friction than contacting rubber seals. This makes the SKF 635-2Z particularly relevant to higher-speed equipment operating in reasonably clean conditions. SKF specifies a reference speed of 80,000rpm and a limiting speed of 40,000rpm; these are catalogue values rather than guaranteed continuous operating speeds, which depend on load, temperature, lubrication and mounting conditions. The bearing has normal (CN) radial internal clearance and a sheet metal cage. For wet, dusty or heavily contaminated environments, a contact-sealed alternative may provide better protection, although typically with greater seal friction. Always confirm the full designation and mounting dimensions before replacement.

Typical Applications:

Miniature electric motors and high-speed motor shafts

Small industrial fans and ventilation mechanisms

Precision guide rollers and compact pulley systems

Light-duty automation and positioning assemblies

Model engineering and miniature mechanical drives