KGI 6308 2RS Deep Groove Ball Bearing
The KGI 6308 2RS Deep Groove Ball Bearing is a widely utilized component in the 6300 series. Thanks to its optimized deep groove geometry, it effectively handles high radial loads as well as axial loads in both directions. The 2RS designation signifies dual rubber seals on both sides of the bearing. This feature provides robust protection against dust, moisture, and environmental contaminants, ensuring a longer service life in industrial and general-purpose applications compared to open or metal-shielded designs.
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Product Detail
Deep Groove Ball Bearing KGI 6308 2RS Dual Rubber Sealed | Enhanced Contamination Protection | Reliable Performance
A dependable solution for electric motors, pumps, fans, and general industrial equipment requiring superior dust and moisture protection.
Introduction to KGI 6308 2RS
The KGI 6308 2RS Deep Groove Ball Bearing is a widely utilized component in the 6300 series. Thanks to its optimized deep groove geometry, it effectively handles high radial loads as well as axial loads in both directions.
The 2RS designation signifies dual rubber seals on both sides of the bearing. This feature provides robust protection against dust, moisture, and environmental contaminants, ensuring a longer service life in industrial and general-purpose applications compared to open or metal-shielded designs.
This bearing comes factory-greased, offering reliable, maintenance-free operation for most common applications.
Technical Code Breakdown (6308 2RS)
6308: The 6 designates a single-row deep groove ball bearing; the 3 specifies the Medium Series; 08 indicates a 40mm bore diameter (08 × 5).
2RS: Rubber seals on both sides of the bearing. These seals provide physical contact, offering a superior barrier against dust and liquids compared to non-contact metal shields (ZZ).
Standard Specifications
6308: The 6 designates a single-row deep groove ball bearing; the 3 specifies the Medium Series; 08 indicates a 40mm bore diameter (08 × 5).
2RS: Rubber seals on both sides of the bearing. These seals provide physical contact, offering a superior barrier against dust and liquids compared to non-contact metal shields (ZZ).
Standard Specifications
| Dirty/Humid Environments |
|---|
Features & Benefits
Superior Contamination Protection
2RS seals prevent the ingress of dust, grit, and moisture, reducing the risk of premature failure.
Combined Load Capacity
Deep groove design allows for high radial loads and axial loads in both directions.
Smooth & Quiet Operation
High-quality surface finishes and premium grease ensure low noise and smooth movement.
Maintenance-Free
Pre-lubricated with high-grade grease for reliable operation without constant maintenance.
Versatile Applications
Suitable for various industrial equipment, production lines, and machinery.
Enhanced Durability
Proper installation and contamination protection significantly extend the bearing's effective service life.
Common Applications
The KGI 6308 2RS is commonly used in:
- Industrial Electric Motors: Standard motors requiring protection in dirty environments.
- Centrifugal Pumps: Where moisture resistance is necessary.
- Fans & Blowers: Protecting internal raceways from dust buildup.
- Gearboxes & Power Transmission: Suitable for moderate speeds and combined loads.
- General Machinery: Conveyors, packaging machines, and industrial production lines.
Selection & Buying Guide
- When to choose 2RS: Choose 2RS rubber seals if the operating environment has dust, moisture, or splashing water.
- High-Speed Concerns: For extremely high RPM applications, consider ZZ metal shields or verify technical specs.
- Installation Quality: Even the highest quality bearing will fail prematurely if installed improperly or misaligned.
- Authenticity: Always inspect engravings on the rings, seal quality, and packaging for KGI authenticity.
Important Installation Tips
1) Apply Pressure to the Fitted Ring
If the shaft fit is tight, apply pressure only to the inner ring (and vice-versa if fitting into a housing).
2) Never Strike Directly
Direct hammer strikes cause indentation (Brinelling) on the raceway, drastically reducing lifespan.
3) Care for 2RS Seals
Avoid damaging the rubber seal edge during installation. Deforming the seal can lead to grease leakage and contamination.
4) Alignment
Improper alignment is a primary cause of excessive vibration and premature failure.
Quick Troubleshooting
- Abnormal Noise: Check for improper installation, seal damage, or contamination.
- Overheating: Check for overly tight fits, high-speed usage issues, or incompatible grease.
- Vibration: Inspect alignment, shaft run-out, and bearing seat condition.
FAQ
1) What is the difference between 2RS and ZZ?
2RS features rubber contact seals for superior dust/moisture protection; ZZ features non-contact metal shields, generally better for higher speeds.
2) Can I remove the seal to re-grease?
It is possible, but not recommended. Removing the seal can damage it, compromising the factory-set seal integrity.
3) Is this suitable for humid environments?
Yes, 2RS provides much better protection against humidity than ZZ, though direct water immersion should still be avoided.
4) What are the standard dimensions of 6308?
The industry standard for 6308 is 40mm x 90mm x 23mm (d x D x B).
Conclusion
If you are seeking a reliable, widely used, and durable bearing for environments where contamination is a concern, the KGI 6308 2RS is an excellent choice, provided installation and alignment best practices are strictly followed.
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