Deep groove ball bearing 6306 ZZ — sealed on both sides, steel, No name

Deep groove ball bearing 6306 ZZ is a standard-size radial bearing manufactured in steel and equipped with metal shields on both sides to limit contamination and help retain lubricant. The bearing is designed for general-purpose mechanical applications where a compact, reliable rolling element solution is required. Its sealed (double-shielded) construction reduces the ingress of dust and debris while allowing moderate rotational speeds and smooth operation under radial loads.

Advantages

The double metal shields provide basic protection against external contamination without the full friction penalty of rubber seals, supporting longer intervals between relubrication in many applications. Steel rings and hardened rolling elements deliver consistent dimensional stability and load-carrying capacity. The 6306 ZZ format is a widely used size, making replacement and interchangeability straightforward in standard electric motors, gearboxes and industrial machinery.

Suitable for

• Electric motors and fans
• Gearboxes and transmission assemblies
• Conveyor rollers and material handling equipment
• General-purpose rotating shafts and housings

Key specifications

• Bearing type: deep groove ball bearing
• Shielding: double metal shields (both sides)
• Material: steel rings and steel rolling elements
• Load orientation: primarily radial loads
• Sealing level: basic contamination protection suitable for moderate environments
• Speed capability: suitable for medium rotational speeds (dependent on lubrication and application)
• Interchangeability: standard 6306 dimensional series

How to use

Select the 6306 ZZ bearing for shafts and housings that match the standard 6306 dimensions. Ensure correct press fit or axle fit according to the application: typically a tight fit on the shaft and a transition or slight interference fit in the housing, depending on thermal and loading conditions. Clean mounting surfaces, apply appropriate lubricant if relubrication is planned, and avoid direct hammering on the raceways or rolling elements when installing. Check alignment and axial positioning to prevent unintended loads that may reduce service life.

Usage recommendations

Use the bearing in environments with light to moderate contamination. For wet, highly contaminated, or high-speed applications consider bearings with rubber seals or specialized sealing solutions. Periodically inspect bearing temperature, noise and vibration, and follow a relubrication schedule when operating conditions permit replenishment through end caps or external lubrication points.