SKF 6306-2Z Metal Shielded Single Row Deep Groove Ball Bearing 30x72x19mm

The SKF 6306-2Z double metal shielded deep groove ball bearing is designed for rotating machinery requiring a combination of load-carrying capability, low friction and reliable running performance. Its 30mm bore, 72mm outside diameter and 19mm width place it in the more substantial 63 series, which offers greater load capacity than the smaller 6206 series where the available housing space permits. The single row deep groove raceways accommodate radial loads together with axial forces in either direction within the bearing's rated capacity. SKF specifies a basic dynamic load rating of 29.6kN and a basic static load rating of 16kN, providing useful reference values for bearing-life calculations and machinery selection.

The 2Z designation identifies steel shields fitted to both sides of the bearing. These non-contact shields help retain the factory-applied grease and reduce the entry of larger particles without the additional rubbing friction associated with contact rubber seals. This makes the 6306-2Z particularly appropriate for comparatively clean, higher-speed applications such as motor drives and industrial fans. SKF publishes a reference speed of 20,000rpm and a limiting speed of 11,000rpm; these are distinct catalogue values, not guaranteed continuous operating speeds. Actual suitability depends on temperature, loading and lubrication conditions. The bearing features normal (CN) radial internal clearance and a pressed sheet metal cage. For replacement work, confirm whether the original equipment requires metal shields, contact seals or increased C3 clearance, as these variants are not functionally identical.

Typical Applications:

Industrial electric motors and drive assemblies

Ventilation fans and air handling equipment

Centrifugal pumps in relatively clean operating environments

Enclosed gearboxes and power transmission systems

Conveyor drive shafts and rotating machinery