SKF 619/9-2Z Metal Shielded Single Row Deep Groove Ball Bearing 9x20x6mm

The SKF 619/9-2Z shielded miniature deep groove ball bearing is engineered for applications where low rotational friction and a compact bearing envelope are important. Its 9mm bore, 20mm outside diameter and 6mm width allow it to fit smaller housings than the 609 bearing, which measures 9 x 24 x 7mm. The single row deep groove construction supports radial loads as well as axial loads in either direction, within the bearing's rated limits. SKF specifies a basic dynamic load rating of 2.34kN and a basic static load rating of 0.98kN. These ratings help engineers assess bearing life and load suitability in miniature rotating assemblies.

The 2Z designation identifies a metal shield on each side of the bearing. Unlike contacting rubber seals, these shields operate without direct contact with the inner ring, helping minimise friction and heat generation at higher speeds. They also help retain the factory-applied grease and restrict the entry of larger particles, although they provide less protection against fine dust and moisture than contact seals. SKF lists a reference speed of 80,000rpm and a limiting speed of 40,000rpm; these are catalogue ratings rather than guaranteed operating speeds under all conditions. The bearing has normal (CN) radial internal clearance, a sheet metal cage and an approximate mass of 7.6g. For replacement, confirm the 619/9-2Z designation and avoid confusing it with a rubber-sealed or stainless-steel variant.

Typical Applications:

Miniature electric motors and instrument drives

Precision automation and positioning mechanisms

Compact guide rollers and pulley systems

Small fans and light-duty rotating assemblies

Measuring equipment and specialised mechanical instruments