608 Open Ball Bearing

The 608 Open Ball Bearing is a deep groove ball bearing engineered for high-speed applications requiring the lowest possible rolling resistance and maximum lubrication freedom.

Unlike ZZ and 2RS versions, the open model has no shields or seals, allowing direct oil or grease circulation through the bearing interior. This design makes the 608 Open widely used in high-speed systems, precision applications, gearboxes, and equipment operating with continuous external lubrication.

Its deep groove design delivers extremely smooth rotation, reduced vibration, and strong mechanical efficiency in compact equipment. Manufactured from chrome steel and built in the standard 8x22x7mm size, the 608 Open is widely used in motors, automation systems, precision equipment, and elevated RPM applications.

Common Applications for the 608 Open

The 608 Open is frequently used in systems requiring elevated speed and minimal rolling resistance, including:

• Compact electric motors
• Gearboxes
• Precision equipment
• Automated systems
• High-speed tools
• Light industrial equipment
• Compact CNC machinery
• RC and hobby applications

Open-type bearings are especially recommended for environments with continuous lubrication and low exposure to external contaminants.

Main Features of the 608 Open

Maximum rotational efficiency

Without shields or seals, the 608 Open delivers lower rolling resistance compared to ZZ and 2RS models.

Excellent high-RPM performance

Deep groove geometry supports high-speed applications with reduced heat generation and stable operation.

Free lubrication flow

The open configuration allows continuous oil or grease circulation, making it widely used in gearboxes and externally lubricated systems.

Smooth and quiet operation

The internal bearing geometry supports reduced vibration and dependable operational stability in compact applications.

Chrome steel construction

Manufactured from hardened chrome steel to provide dependable mechanical strength and long operational life in industrial rotating systems.

When Is the 608 Open Commonly Recommended?

This model is typically selected when applications require:

• maximum rotational speed
• minimal rolling resistance
• continuous lubrication
• precision equipment
• high-efficiency operation

Difference Between 608 Open, 608-ZZ, and 608-2RS

Each configuration provides different advantages depending on the operating environment.

608 Open

• no seals or shields
• lowest rolling resistance
• ideal for continuously lubricated systems
• maximum high-RPM efficiency

608-ZZ

• metal shields
• light dust protection
• lower friction than 2RS
• better suited for dry environments

608-2RS

• rubber seals
• stronger contaminant protection
• improved grease retention
• focused on reduced maintenance

Installation Recommendations

For best 608 Open performance:

• Use proper lubrication
• Avoid dust contamination
• Control operating temperature
• Verify shaft alignment
• Monitor excessive vibration

PGN Bearings Product Line

PGN Bearings supplies components for industrial automation, mechanical power transmission, and rotating systems. The catalog includes deep groove ball bearings, mounted bearings, pillow blocks, roller chains, flanged bearings, and solutions engineered for continuous industrial applications.

FAQ

What does “Open” mean on a bearing?

It means the bearing has no seals or shields.

Is the 608 Open suitable for high-speed operation?

Yes. This model is widely used in high-RPM applications because of its very low rolling resistance.

Does the open model require external lubrication?

Yes. Open bearings typically operate with continuous oil or grease lubrication.

What is the difference between Open and ZZ?

The Open version has no side protection, while ZZ bearings use metal shields for light dust protection.

Can this bearing be used in electric motors?

Yes. The 608 Open is widely used in compact motors, automation systems, and precision applications.