The SKF 629-2Z is an SKF Explorer miniature deep groove ball bearing designed for compact rotating equipment requiring a 9mm shaft bore and efficient high-speed operation. Measuring 9 x 26 x 8mm, it features non-contact steel shields on both sides to retain factory grease while reducing friction compared with rubber contact-sealed alternatives. Its robust 62-series miniature construction supports radial loads and moderate axial loads in both directions. With normal radial internal clearance and a sheet metal cage, it is suited to small electric motors, precision drive units, instrument mechanisms and compact industrial assemblies.
The SKF 629-2Z double-shielded miniature deep groove ball bearing is engineered for small rotating assemblies where a 9mm shaft requires reliable support without sacrificing rotational speed. Its 26mm outside diameter and 8mm width provide a more substantial bearing cross-section than the smaller 609 series, subject to available housing space. The single row deep groove raceways accommodate radial forces and axial loads acting in either direction within the manufacturer's rated limits. SKF specifies a basic dynamic load rating of 4.75kN and a basic static load rating of 1.96kN, making these useful reference values when calculating bearing life or evaluating intermittent loading. SKF Explorer construction is designed to support efficient operation with low noise and vibration.
The 2Z designation identifies a steel shield on each side of the bearing rather than rubber contact seals. These non-contact shields help retain the factory grease and reduce the entry of larger airborne particles while generating less sealing friction than contacting rubber lips. They are particularly appropriate for relatively clean, high-speed environments; equipment exposed to persistent moisture, washdown or fine contamination may require a contact-sealed alternative such as the SKF 629-2RSH. SKF lists a 30,000rpm limiting speed and 60,000rpm reference speed, although these figures are not interchangeable and actual permissible operating speed depends on load, lubrication and temperature. Normal (CN) radial internal clearance and a sheet metal cage complete the specification. For replacements, confirm that the original bearing requires 2Z shields rather than 2RSH seals or C3 clearance.
Typical Applications:
Small electric motors and miniature fan drives
Precision mechanical transmission assemblies
Compact automation and positioning mechanisms
Small guide rollers and pulley systems
Instrument drives and light-duty rotating equipment
