1304RR
Heavier self-aligning ball bearings with higher load capacity than 1200 series. For applications with significant misalignment and moderate radial loads.
NSK6304DDU20 × 52 × 15mm
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Geometry100%
20 × 52 × 15mm
Sealing100%
Rubber sealed → 2RS1 / 2RSR / DDU / LLU
Load rating100%
Cr 16.8 kN / C₀r 7.8 kN
Speed100%
19,000 rpm (grease)
Specifications
| Bore diameter (d) | 20 mm |
| Outer diameter (D) | 52 mm |
| Width (B) | 15 mm |
| Dynamic load rating (C) | 16.8 kN |
| Static load rating (C₀) | 7.8 kN |
| Weight | 139 g |
| Max speed (grease) | 19,000 rpm |
| Max speed (oil) | 13,600 rpm |
Why This Match Is Correct
✓Exact dimensional match (bore, OD, width)
✓Load ratings within tolerance
✓Seal type verified via manufacturer tables
✓Speed rating compatible
Equivalents Across Brands
Internal Clearance
Normal Clearance (CN)
Standard radial internal clearance. Suitable for most applications under normal operating conditions.
Best forGeneral-purpose use. Normal temperatures, standard fits, moderate speeds.
TemperatureUp to ~70°C operating temperature
Seal Type
Rubber Sealed (2RS)
Rubber contact seals on both sides. Superior protection from contaminants. Pre-lubricated, maintenance-free.
Best forDirty, dusty, or wet environments. Applications requiring long maintenance-free operation.
Avoid forVery high-speed applications (seal friction limits top speed). Environments exceeding 110°C.
Examples
- Agricultural machinery
- Conveyor rollers
- Automotive components
- Outdoor equipment
- Washing machines
Where This Bearing Is Used
Heavy conveyor systemsMining equipmentVibrating screensAgricultural harvestersLarge fans and blowersBulk material handlingFood processing equipmentGeneral-purpose electric motors (1-10 HP)Pumps and compressorsAutomotive alternators and A/C compressorsConveyor rollersAgricultural machineryWashing machinesIndustrial fansPrinting presses
MiningHeavy industryAgricultureFood processing
Other Variants Available
Same bearing geometry — different seal and clearance configurations.
| SKF Part Number | Seal Type | Clearance |
|---|---|---|
| 1304 ETN9 | Open (No Seal) | CN |
| 1304 ETN9 C3 | Open (No Seal) | C3 |