FAGI 6308 2RS C3 P6 Deep Groove Ball Bearing
The FAGI 6308 2RS C3 P6 Deep Groove Ball Bearing is one of the most popular and reliable medium-duty industrial bearings. Designed for 40mm diameter shafts, this bearing belongs to the 63 series, which features thicker races and larger balls compared to lighter series (like 60 or 62). This gives it superior mechanical resistance against shocks, vibration, and heavier loads. Features like 2RS double rubber seals, C3 internal thermal clearance, and P6 precision grade make it a trusted choice for dusty industrial environments and machines that run continuously for long hours.
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Product Detail
Deep Groove Ball Bearing 6308 2RS C3 P6 by FAGI Smooth Operation, Dual Rubber Sealed, Thermal Clearance & High Precision
A robust and widely used choice for industrial electric motors, heavy-duty water pumps, gearboxes, and machinery with 40mm shafts.
Introduction to the FAGI 6308 2RS C3 P6 Deep Groove Ball Bearing
At the core of every machine performing rotational work lies a critical metal component called a bearing. The primary job of a bearing is to hold the shaft securely in place, allowing it to rotate smoothly and efficiently without grinding against the machine housing. Without the correct bearing, or if a bearing is damaged, metal rubs against metal, leading to excessive heat, annoying noise, and eventually, costly damage to both the shaft and the motor.
The FAGI 6308 2RS C3 P6 Deep Groove Ball Bearing is one of the most popular and reliable medium-duty industrial bearings. Designed for 40mm diameter shafts, this bearing belongs to the 63 series, which features thicker races and larger balls compared to lighter series (like 60 or 62). This gives it superior mechanical resistance against shocks, vibration, and heavier loads. Features like 2RS double rubber seals, C3 internal thermal clearance, and P6 precision grade make it a trusted choice for dusty industrial environments and machines that run continuously for long hours.
The FAGI brand manufactures this product following strict quality standards, ensuring that industrial professionals, repair technicians, and plant managers can rely on its dimensional compatibility and material integrity for refurbishing projects or new production lines. However, remember that even the most precisely manufactured bearing depends on correct application and installation; it is not a "magic fix" without proper maintenance.
Decoding the Technical Code (Simple Explanation)
The numbers and letters engraved on the metal edge or the rubber seal act like an ID card, telling you exactly what the bearing is designed for:
- Digit '6': Identifies it as a single-row deep groove ball bearing—the most common bearing type in the world, capable of handling radial loads (the weight on the shaft) and moderate axial loads.
- Digit '3': Indicates the series or weight class. The '3' series has a beefier construction, thicker rings, and larger balls than series 0, 1, or 2, making it ideal for heavier loads.
- Digits '08': This is the code for the inner diameter (bore size). By standard convention, for numbers above 03, you multiply this by 5 (08 × 5 = 40). Therefore, the inner diameter is exactly 40 mm, fitting perfectly onto a 40mm shaft.
- '2RS': Means the bearing has rubber seals reinforced with metal on both sides. This keeps the factory grease inside and prevents dirt and dust from entering. Note: 2RS does not mean it is 100% waterproof; it is resistant to splashes, but direct high-pressure water spray may penetrate it over time.
- 'C3': Indicates higher-than-normal internal clearance. As industrial machines heat up, the metal of the shaft and the bearing expands. C3 clearance provides the necessary space to prevent the balls from binding or "seizing" due to this heat expansion.
- 'P6': Signifies that the bearing is manufactured with higher precision and tighter tolerances than standard models (Normal/P0). Tighter tolerances contribute to smoother operation and balance, though overall system noise also depends on shaft alignment and mounting quality.
Precise Dimensions
When replacing a worn-out component, verify these dimensions to ensure the bearing fits correctly. The standard international dimensions for the 6308 bearing are:
- Inner Diameter (Bore): 40 mm
- Outer Diameter: 90 mm
- Width (Thickness): 23 mm
Note: If your shaft is 40mm but your housing diameter is 80mm, you likely need a 6208 bearing. Always use a caliper or check your machine manual before purchasing.
Key Benefits
Excellent Load & Shock Resistance
The 63 series construction offers stronger rings and larger balls, providing durability against mechanical stress and sudden shocks.
Protection in Dusty Environments
The 2RS seals effectively prevent dirt, metal shavings, and debris from contaminating the internal raceways.
Safe Against Thermal Expansion
C3 clearance ensures the bearing operates freely even when components expand due to high-temperature operation.
Maintenance-Free Lubrication
Comes pre-greased with high-quality lubricant. The sealed design prevents grease leakage and eliminates daily maintenance.
Higher P6 Precision
Tighter tolerances provide smoother movement and reduced vibration, essential for high-performance machinery.
Readily Available
The 6308 is a common industrial standard, ensuring quick availability to minimize factory downtime.
Why Choose FAGI 6308?
The bearing market is flooded with various brands, but not all prioritize the steel hardening process, ball quality, and seal integrity equally. FAGI has built a reputation among industrial professionals by offering bearings with precise finishes, clear laser markings, and standardized packaging.
Using quality steel in the races and balls, FAGI ensures long-term consistency, making it a logical, cost-effective choice for reliability-focused operations.
Common Applications
- Industrial Electric Motors: Standard motors requiring high-speed stability and heat management.
- Industrial Fans & Blowers: Centrifugal fans used for continuous airflow in manufacturing plants.
- Heavy Agricultural Machinery: Shredders, combines, and dump trucks exposed to field dust.
- Conveyor Belts: Main rollers where significant load is concentrated.
Buying Guide
Before you order, follow these simple steps to ensure you get the exact bearing for your machine:
- Check the Existing Code: If "6308" is engraved on the old bearing or mentioned in the manual, stick to it. Do not substitute with lighter series.
- Match the Seal: If your machine is in a dry, cool area, metal shields (ZZ) might work; but if dust is present, 2RS is the safer choice.
- Verify C3 Need: If your motor runs hot for long periods, C3 is necessary. For low-speed or ambient-temperature applications, normal clearance is fine.
- Check Precision: P6 is beneficial for vibration-sensitive equipment.
- Buy from Trusted Sources: Purchase from suppliers who guarantee the authenticity of the FAGI brand and provide official invoicing.
Installation Guide (Preventing Premature Failure)
1. Thorough Cleaning
Clean the shaft and housing thoroughly. Burrs, old oil, or dust particles can prevent proper seating.
2. Correct Force Application
If mounting on a shaft, press only the inner ring. If fitting into a housing, press only the outer ring. Never press through the rolling elements (balls).
3. No Direct Hammering
Avoid direct hammer strikes. Use appropriate sleeves or a manual press to apply even pressure.
4. Keep Seals Intact
Do not remove the 2RS seals; they are factory-set for optimal performance.
Maintenance Tips
- Avoid Pressure Washing: Do not aim high-pressure water directly at the bearing seal.
- Check Belt Tension: Excessive belt tension puts unnecessary load on the bearing and wears it out quickly.
- Monitor Heat & Noise: Regular touch-checks and listening for abnormal sounds can catch problems early.
- Storage: Keep spare bearings in their original, unopened packaging in a dry place.
Signs of Bearing Failure
- Howling, grinding, or rough noises that increase with motor speed.
- Unusual heat on the bearing housing surface.
- Noticeable vibration during operation.
- Difficulty rotating the shaft by hand when the machine is off.
- Grease darkening, leaks, or a burning smell.
Frequently Asked Questions
1. What are the exact dimensions of a 6308 bearing?
Inner diameter: 40mm, Outer diameter: 90mm, Width: 23mm.
2. Difference between 6308 and 6208?
The 6308 is wider (23mm vs 18mm) and has a larger outer diameter (90mm vs 80mm). They are not interchangeable without housing modifications.
3. When should I choose C3 clearance?
Choose C3 if the machine operates at high temperatures or runs continuously, as it prevents seizure due to thermal expansion.
Conclusion
The FAGI 6308 2RS C3 P6 Deep Groove Ball Bearing is a robust choice for industrial and agricultural applications requiring 40mm shaft compatibility and high load resistance. With its durable 2RS seals, thermal-ready C3 clearance, and P6 precision, it ensures smooth, long-term operation. Proper installation will guarantee this bearing serves your machinery reliably for years to come.
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