DKFL 62306 2RS C3 Deep Groove Ball Bearing
The DKFL 62306 2RS C3 is a specialized deep groove ball bearing belonging to the Wide Dimension Series (ISO 23 Series). While sharing the identical inner diameter (30 mm) and outer diameter (72 mm) with standard 6306 bearings, its defining mechanical distinction lies in its expanded 27 mm width (compared to standard 19 mm). This reinforced profile delivers significantly higher rigidity, superior resistance against tilting moments, and a vastly expanded grease cavity.
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Product Detail
Wide Deep Groove Ball Bearing DKFL 62306 2RS C3 Special Wide Series | C3 Internal Clearance | Dual 2RS Rubber Contact Seals
Engineered for heavy-duty applications with a special 27 mm width, providing superior load-bearing stability, extended grease reservoir capacity, and optimal heat compensation for alternators, agricultural machinery, and industrial drives.
Technical Overview: DKFL 62306 2RS C3 Bearing
The DKFL 62306 2RS C3 is a specialized deep groove ball bearing belonging to the Wide Dimension Series (ISO 23 Series). While sharing the identical inner diameter (30 mm) and outer diameter (72 mm) with standard 6306 bearings, its defining mechanical distinction lies in its expanded 27 mm width (compared to standard 19 mm). This reinforced profile delivers significantly higher rigidity, superior resistance against tilting moments, and a vastly expanded grease cavity.
Manufactured under rigorous quality control standards by DKFL, this bearing incorporates C3 radial internal clearance, making it exceptionally reliable in operating environments characterized by elevated temperatures and high shaft expansion. Equipped with dual sheet-reinforced nitrile rubber contact seals (2RS) and filled with high-grade synthetic grease, the DKFL 62306 operates as a true maintenance-free, sealed-for-life industrial component.
Part Number Nomenclature & Engineering Code Breakdown
6: Identifies a Single-Row Radial Deep Groove Ball Bearing.
23: ISO Dimension Series 23 (Combines Diameter Series 3 geometry with an extra-wide 27 mm cross-section for elevated structural support).
06: Standard Metric Bore Code; multiplied by 5 represents an exact shaft bore of 30 mm.
2RS: Dual heavy-duty nitrile butadiene rubber (NBR) lip contact seals with internal steel stiffening plates, safeguarding against moisture and particulate contamination.
C3: Radial internal clearance greater than Normal (CN). Compensates for tight press-fit reduction and thermal shaft expansion under full-load operation.
Technical Specifications & Dimensional Data
| Bore Diameter (d) | Outer Diameter (D) | Total Width (B) | Seal Construction | Radial Clearance | Lubrication Type | Brand |
|---|---|---|---|---|---|---|
| 30 mm | 72 mm | 27 mm (Special Wide) | 2RS (Dual Rubber Seals) | C3 | Maintenance-Free Pre-Greased | DKFL |
Key Advantages of DKFL 62306 2RS C3
Expanded Lubricant Reservoir
The 27 mm wide housing allows a significantly larger internal grease volume, extending lubricant breakdown resistance and doubling operating longevity.
Thermal Expansion Compensation (C3)
The engineered C3 radial internal clearance prevents ball pinching and bearing seizure during thermal gradients and high continuous shaft temperatures.
High Seat Stability & Tilt Resistance
Wider raceway support seating on both shaft and housing counteracts angular misalignment and tilting forces under severe belt tension.
High Seat Stability & Tilt Resistance
Wider raceway support seating on both shaft and housing counteracts angular misalignment and tilting forces under severe belt tension.
Hermetic 2RS Rubber Sealing
Precision-molded elastomer lip seals deliver complete hermetic protection against abrasive airborne dirt, washdown fluids, and farm field debris.
- Heavy-Duty Alternators & Industrial Dynamos: Where higher belt preload and side-pull stresses necessitate broader seating width and stable shaft alignment.
- Agricultural Harvesters & Combine Equipment: Used in critical pulley assemblies, idlers, and threshing drives operating under severe dust and moisture conditions.
- Industrial Centrifugal Pumps: Supports 30 mm shafts exposed to thermal expansion and continuous mechanical pumping loads.
- Heavy Conveyors & Material Handling Gearboxes: Provides enhanced moment load resistance against dynamic shock loads and vibration.
- Continuous-Duty Electric Motors: Where C3 internal clearance prevents high-temperature rotor lockups during 24/7 service cycles.
Engineering Comparison: 62306 vs. Standard 6306
Both bearings feature the same 30 mm bore diameter and 72 mm outer diameter; however, the critical technical difference lies in their width dimension:
- Standard 6306 Width: 19 mm (Standard ISO 03 Series width).
- Special 62306 Width: 27 mm (Wide Series with an extra 8 mm seating shoulder).
- Operational Impact: The 27 mm width of the 62306 provides vastly superior resistance against shaft bending moments and contains substantially more grease. (Note: When retrofitting, always verify that your housing depth and shaft shoulder clearance can accommodate the 27 mm profile).
Mounting & Installation Best Practices
1) Correct Press Force Application
When fitting onto a 30 mm shaft, apply mounting force exclusively to the face of the inner ring. Never transmit mounting force through the rolling elements or impact the 2RS seals directly.
2) Do Not Remove Factory 2RS Seals
The DKFL 62306 is factory-filled with precisely metered high-performance lithium complex grease. Prying open rubber seals can permanently deform the sealing lip and introduce contamination.
3) Shaft and Housing Shoulder Alignment
Ensure the shaft step has sufficient clearance to support the 27 mm ring evenly, avoiding burrs and keeping shaft runout within ISO tolerances.
4) Strictly Avoid Open Flame Heating
If thermal mounting is required, use a controlled induction heater (max 110°C / 230°F). Never expose the bearing to open torches, which destroy the synthetic grease and degrade rubber seals.
Frequently Asked Questions (FAQ)
1. What are the exact dimensions of the DKFL 62306 2RS C3 bearing?
It features a 30 mm inner bore, a 72 mm outer diameter, and a specialized wide profile of 27 mm in width.
2. Can the 62306 replace a standard 6306 bearing?
Only if the housing depth and shaft shoulder have adequate clearance to accommodate the wider 27 mm profile (standard 6306 is 19 mm wide). When space permits, the 62306 offers superior stability and longer lubrication life.
3. What does the C3 designation signify?
C3 denotes greater internal radial clearance than standard (CN), preventing internal ball binding and overheating caused by shaft thermal expansion and tight press-fits.
4. Does this bearing require initial greasing before installation?
No. The 2RS suffix denotes dual contact rubber seals enclosing factory-injected premium grease designed for the bearing’s entire service life.
Conclusion & Summary
The DKFL 62306 2RS C3 wide deep groove ball bearing offers the ideal combination of dimensional rigidity, large grease holding capacity, and thermal stability. Engineered to withstand heavy radial and moment loads in industrial alternators, agricultural machinery, and high-demand rotating equipment, it delivers long-lasting, maintenance-free reliability.
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