KGI 6309 2RS Deep Groove Ball Bearing
The KGI 6309 2RS Single Row Deep Groove Ball Bearing is a strategic and high-demand size for mechanical equipment and industrial production lines. Falling within the 6300 series dimensions, this bearing features thicker rings and larger steel balls compared to the 6000 and 6200 series, offering superior capacity for static and dynamic load handling.
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Product Detail
KGI 6309 2RS Deep Groove Ball Bearing Double Rubber Contact Seals | 45mm Bore | Industrial-Grade Durability
A reliable and heavy-duty solution from the Medium series, designed to withstand significant radial loads in industrial pumps, electric motors, and power transmission equipment.
Overview: KGI 6309 2RS
The KGI 6309 2RS Single Row Deep Groove Ball Bearing is a strategic and high-demand size for mechanical equipment and industrial production lines. Falling within the 6300 series dimensions, this bearing features thicker rings and larger steel balls compared to the 6000 and 6200 series, offering superior capacity for static and dynamic load handling.
The 2RS suffix indicates that the bearing is equipped with two elastomer-reinforced steel seals on both sides. These seals fit precisely against the inner ring, creating a tight barrier that protects the sensitive internal channels against dust, abrasive particles, metal shavings, and moisture spray.
This product comes pre-lubricated with high-quality factory grease, ensuring smooth operation, maintenance-free service during its lifecycle, and minimal thermal wear.
Overview: KGI 6309 2RS
The KGI 6309 2RS Single Row Deep Groove Ball Bearing is a strategic and high-demand size for mechanical equipment and industrial production lines. Falling within the 6300 series dimensions, this bearing features thicker rings and larger steel balls compared to the 6000 and 6200 series, offering superior capacity for static and dynamic load handling.
The 2RS suffix indicates that the bearing is equipped with two elastomer-reinforced steel seals on both sides. These seals fit precisely against the inner ring, creating a tight barrier that protects the sensitive internal channels against dust, abrasive particles, metal shavings, and moisture spray.
This product comes pre-lubricated with high-quality factory grease, ensuring smooth operation, maintenance-free service during its lifecycle, and minimal thermal wear.
Technical Code Analysis (6309 2RS)
| Bore (d) | Outer Dia (D) | Width (B) | Seal Type | Lubrication | Target Environment |
|---|---|---|---|---|---|
| 45 mm | 100 mm | 25 mm | 2RS (Rubber Contact) | Industrial Grease | Dusty & Humid |
Key Features & Benefits
Maximum Seal Protection
The 2RS contact edges prevent grease leakage and stop abrasive particles from infiltrating the ball raceways.
High Dynamic Load Capacity
Larger ball size compared to lighter series offers exceptional resistance against impact and continuous radial loads.
Reduced Maintenance Costs
Compact design with initial factory lubrication eliminates the need for frequent servicing and manual greasing.
High-Grade Alloy Steel (GCr15)
Precision heat treatment on balls and rings ensures high surface hardness and fatigue resistance.
Dual-Direction Axial Load
The precise deep groove geometry allows for handling axial forces in both directions without losing performance.
Dimensional Stability
Super-finished surfaces prevent unnecessary friction, destructive vibrations, and mechanical efficiency loss.
Industrial Applications
The robust dimensions and superior sealing of the KGI 6309 2RS make it ideal for:
- Medium to Heavy Electric Motors: Three-phase industrial motors and generators operating in dusty environments.
- Centrifugal and Submersible Pumps: Water supply and industrial wastewater equipment where moisture contact is inevitable.
- Industrial Gearboxes: Shafts and pulleys requiring high radial load capacity.
- Compressors & Blowers: Industrial fans and rotors in cement, steel, and timber plants.
- Conveyors & Agriculture Machinery: Heavy rollers exposed to direct dirt, sand, and contaminants.
Technical Selection & Buying Guide
- Choosing between 2RS and ZZ: The 2RS seal offers higher contamination protection. While ZZ (metal shield) allows for slightly higher limiting speeds, 2RS is definitely recommended for wet or highly dusty environments.
- Shaft & Housing Check: Ensure your shaft (45mm) and housing fits align with engineering tolerances to guarantee proper operating clearance.
- Operating Temperature: NBR rubber seals in 2RS models generally support temperatures up to 110-120°C; evaluate special materials for higher temperature requirements.
- Quality Verification: Always inspect the packaging, the precision of the laser-etched KGI brand markings, and the flexibility of the seal lips.
Critical Installation Tips
1. Force Application
When pressing the bearing onto a 45mm shaft, force must be applied only to the inner ring to ensure stress is not transmitted through the balls.
2. Proper Tools
Avoid direct hammer blows or sharp punches. Use an induction heater or proper sleeve tool. Direct heat can destroy the metallurgical properties of the steel.
3. Seal Integrity
Sharp tools must not touch the rubber seal. Any puncture or dent compromises lubrication and bearing service life.
4. Alignment
Shaft misalignment beyond tolerances results in asymmetrical loading and abnormal overheating.
Troubleshooting
- Continuous Grinding Noise: Could indicate ball indentation from improper installation or contamination from a damaged seal.
- Abnormal Overheating: Often caused by excessive fit (too tight), loss of internal clearance, or operating speeds exceeding the seal limit.
- Tangible Vibration: Check for shaft misalignment, bent axes, or excessive play in the housing seat.
FAQ
1. What are the dimensions of the 6309 bearing?
The global standard dimensions are 45mm bore, 100mm outer diameter, and 25mm width.
2. Does the KGI 6309 2RS need initial greasing?
No; it comes "Sealed For Life" with factory-optimized high-quality grease.
3. What is the difference between 6209 and 6309?
Both have a 45mm bore, but the 6309 has a larger OD (100mm vs 85mm) and width (25mm vs 19mm), providing significantly higher load capacity.
4. Are 2RS seals oil-resistant?
Yes; the standard NBR material used in our seals is oil-resistant and protects well against common hydraulic and industrial oils.
Summary
The KGI 6309 2RS Deep Groove Ball Bearing offers a perfect balance of heavy-load capacity, contamination resistance, and operational longevity. If you operate in harsh industrial environments, you can rely on this bearing to keep your production lines moving without unplanned interruptions.
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