KGI 6306 2RS Deep Groove Ball Bearing
The KGI 6306 2RS Single Row Deep Groove Ball Bearing is a standard, essential component in industrial machinery and power transmission systems. With a 30mm bore diameter, it belongs to the 63 (Medium) series. Compared to light series bearings (such as 6006 or 6206), this bearing features larger balls and thicker inner/outer rings, providing significantly higher mechanical load capacity and resistance to shock loads.
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Product Detail
Deep Groove Ball Bearing KGI 6306 2RS Double-Sided Rubber Contact Seals | 30mm Bore | High Radial Load Capacity
A robust, heavy-duty solution from the Medium Series (6300), engineered for reliable performance in electric motors, pumps, gearboxes, and industrial machinery.
Overview: KGI 6306 2RS
The KGI 6306 2RS Single Row Deep Groove Ball Bearing is a standard, essential component in industrial machinery and power transmission systems. With a 30mm bore diameter, it belongs to the 63 (Medium) series. Compared to light series bearings (such as 6006 or 6206), this bearing features larger balls and thicker inner/outer rings, providing significantly higher mechanical load capacity and resistance to shock loads.
The 2RS suffix indicates the use of two steel-reinforced rubber contact seals on both sides. These sealing lips provide an elastic, tight contact with the inner ring, creating an impermeable barrier against abrasive dust, metal shavings, dirt particles, and fluid splashes.
This bearing comes factory-filled with high-quality industrial grease and requires no maintenance or re-greasing, minimizing downtime and maintenance costs.
Technical Code Analysis (6306 2RS)
6: Single Row Deep Groove Ball Bearing identification.
3: Medium Duty Series; features greater groove depth and cross-sectional strength compared to 60 or 62 series.
06: Bore Diameter code: 06 × 5 = 30 mm.
2RS: Two rubber (NBR) contact seals on both sides to block contaminants and retain lubricant.
Dimensions & Specifications
| Bore (d) | Outer (D) | Width (B) | Sealing Type | Lubrication | Environment |
|---|---|---|---|---|---|
| 30 mm | 72 mm | 19 mm | 2RS (Rubber Contact) | Factory Standard | Dusty/Wet |
Key Features & Benefits
2RS Impermeable Sealing
Contact seals block tiny suspended particles and moisture, protecting the balls while retaining the lubricant.
High Dynamic Load Capacity
The 63-series structure provides exceptional resistance to high radial loads and sudden mechanical shocks.
Maintenance-Free
Lifetime factory lubrication eliminates the need for labor-intensive maintenance and prevents failure due to lack of grease.
Hardened Bearing Steel (GCr15)
Optimized heat treatment ensures high surface hardness, enhancing resistance to wear and metal fatigue.
Axial Load Handling
Beyond primary radial loads, the deep groove geometry accommodates bidirectional axial loads as well.
Smooth, Quiet Operation
Precise finishing reduces friction-induced energy loss and vibration during operation.
Industrial Applications
The KGI 6306 2RS is widely used as a reliable radial support in various industries:
- Mid-size Industrial Motors: Electric motors and generators operating in harsh workshop environments.
- Industrial Pumps & Centrifuges: Shafts exposed to ambient humidity or fluid leakage.
- Gearboxes: Input or output shafts requiring 30mm bore support under radial pressure.
- Agricultural Machinery: Harvesters, tillers, and cultivators operating in dusty or muddy terrain.
- Conveyor Systems: Idler rollers and material handling equipment with moderate-to-heavy loads.
Selection & Purchasing Guide
- 2RS vs ZZ: If the environment is clean, metal-shielded (ZZ) bearings are ideal for high speeds. However, for environments with dust, dirt, or moisture, the 2RS model is the only reliable choice.
- Verify Housing Dimensions: Ensure compatibility with your 30mm shaft, 72mm housing, and 19mm width requirements.
- Temperature Limits: Standard NBR rubber seals handle temperatures up to 110°C–120°C. For higher heat, specialized heat-resistant seals (Viton) are required.
- Authenticity: Look for the clear engraving of the "KGI" logo and technical codes on the bearing ring and seal.
Installation Best Practices
1) Apply Pressure Only to the Mating Ring
When installing on the 30mm shaft, apply force only to the inner ring to avoid damaging the balls or raceways.
2) No Open Flame Heating
Do not use torches or open flames, as this vaporizes the internal grease and deforms the rubber seal. Use an induction heater if needed.
3) Protect the Seals
Avoid contact with sharp tools, screwdrivers, or levers; puncturing the seal leads to grease leakage and rapid failure.
4) Check Shaft Alignment
Misalignment or shaft runout causes uneven load distribution and premature fatigue.
Troubleshooting
- Continuous Grinding Noise: Often indicates foreign particles entering due to damaged seals, or shock impact during assembly.
- Excessive Temperature: May be caused by an interference fit that is too tight (reducing internal clearance) or rotation exceeding the seal's speed rating.
- Abnormal Vibration: Check for shaft runout, coupling misalignment, or excessive housing clearance.
Frequently Asked Questions (FAQ)
1) What are the dimensions of the 6306 bearing?
The global standard dimensions are 30mm inner diameter, 72mm outer diameter, and 19mm width.
2) Does the KGI 6306 2RS need initial grease application?
No, this bearing is "Sealed For Life," factory-filled with the correct amount of industrial grease, requiring no further maintenance.
3) What is the difference between 6206 and 6306?
Both have a 30mm bore, but the 6306 has a larger outer diameter (72mm vs 62mm) and width (19mm vs 16mm), providing higher load capacity.
4) Are 2RS seals waterproof?
Yes, the NBR contact seal design provides high resistance against water splashes, moisture, and common industrial lubricants.
Conclusion
The KGI 6306 2RS Deep Groove Ball Bearing offers the perfect balance of 6300-series strength, reliable radial load capacity, and superior contamination protection. It is a high-performance, maintenance-free solution ensuring continuous operation for your critical industrial equipment.
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