The FAFNIR W209PP is a premium deep-groove ball bearing distinguished by its extra-wide inner ring and double-sealed construction. Manufactured under the Fafnir brand (now part of Timken), this single-row bearing features the width of a double-row bearing with the same bore/OD dimensions, providing exceptional shaft support and stability for high-load applications.
This comprehensive guide covers everything you need to know about the W209PP bearing, from detailed specifications and applications to maintenance tips and replacement options.
Key Specifications of the FAFNIR W209PP
Dimensions and Construction
- Bore (ID): 45 mm
- Outside Diameter (OD): 85 mm
- Width: ~30.18 mm (1.188 inches)
- Design: Single-row deep-groove ball bearing with wide inner ring
- Sealing: Double rubber contact seals (PP designation)
- Weight: Approximately 0.62 kg (1.4 lbs)
The W209PP’s dimensions match the ID and OD of a standard 6209 bearing, but its width is substantially greater—comparable to a double-row 5209 bearing. This extended inner ring provides a larger contact area on the shaft, enhancing support and stability.
Material Composition
- Rings and Balls: High-chrome steel (52100 grade, through-hardened)
- Cage: Pressed steel design for even ball spacing
- Seals: Buna-N (nitrile) rubber bonded to metal stiffeners
- Precision Class: ABEC-1/ISO P0 standard
Performance Ratings
- Dynamic Load Rating: 48.7 kN (~11,000 lbf)
- Static Load Rating: 31.8 kN (~7,150 lbf)
- Extended Fatigue Life Load Rating: 36 kN dynamic / 17.6 kN static
- Maximum Speed: ~4,615 RPM with grease lubrication (up to 5,385 RPM with oil)
- Temperature Range: -34°C to +120°C (-30°F to 248°F)
- Internal Clearance: C3 (greater than normal)
Understanding the W209PP Designation
The part code W209PP breaks down as follows:
- “W”: Indicates the extra-wide inner ring design
- “209”: Size identification (45mm bore, 85mm OD)
- “PP”: Double rubber contact seals (one on each side)
This product typically features C3 internal clearance, though this isn’t explicitly stated in the part number. The C3 clearance provides slightly more internal space to accommodate thermal expansion during operation.
Applications: Where to Use the FAFNIR W209PP
Automotive Applications
This commonly used in automotive cooling fan assemblies and electric motors. Its wide inner ring effectively handles the overhung load of fan blades while providing excellent shaft stability. In some automotive parts catalogs, it’s referenced under codes like T-8507.
Electric Motors and Pumps
Beyond automotive use, this bearing is extensively utilized in:
- Medium-sized electric motors
- Industrial fans and blowers
- HVAC systems
- Small to medium pumps
- Pneumatic tools
- Household appliances
The wide inner ring helps position the rotor on the shaft and provides additional support, contributing to quieter operation—a key reason these are often labeled as “electric motor quality” bearings.
Agricultural Machinery
The W209PP and its variants are found in agricultural equipment including:
- Disc harrows
- Planters
- Mower spindles
- Pulley and idler assemblies
Special versions with different bore shapes (such as the W209PPB5 with a 1-1/4″ square bore) are manufactured specifically for agricultural applications like John Deere disc harrows.
Industrial Equipment
In general machinery, the W209PP is ideal for applications that would typically call for a double-row ball bearing but with only moderate axial loads. Examples include:
- Conveyors
- Light-duty gearboxes
- Machinery linkages
Equivalent and Replacement Models
When sourcing a replacement, match the dimensions (45×85×30.18 mm), inner ring style, and sealing type. Here are equivalent designations from various manufacturers:
| Manufacturer | Equivalent Model | Notes |
|---|---|---|
| Timken (Fafnir) | W209PP | Original bearing code |
| MRC (SKF) | 209SZZC | Similar dimensions but uses shields instead of seals |
| SKF / FAG | 462209-2RS1 | Double-sealed equivalent |
| PFI / Aftermarket | W209PP | Direct equivalents use the same designation |
| John Deere | JD8664 (W209PPB5) | Special variant with 1-1/4″ square bore (not directly interchangeable) |
Always ensure replacement bearings have comparable load ratings, speed ratings, and clearance specifications.
Maintenance and Troubleshooting
Installation Best Practices
- Always apply pressure to the ring being fitted (never press on the outer ring while the inner ring is fixed, or vice versa)
- Ensure proper alignment—the bearing doesn’t have self-aligning capability
- Use correct tolerance for shaft/housing fits (typically press fit on one ring and clearance fit on the other)
Common Issues and Solutions
| Issue | Possible Causes | Solution |
|---|---|---|
| Premature failure | Contamination, overheating, excessive load | Replace bearing and address environmental/application issues |
| Noise or vibration | Imbalanced fan, worn bearing, improper installation | Balance rotating assembly, check for play, replace if necessary |
| Lubrication failure | Excessive heat, high speed operation | Replace bearing (relubrication isn’t typically possible with sealed bearings) |
| Seal damage | Physical impact, chemical exposure, aging | Replace bearing if seals are compromised |
The W209PP is designed as a “fit-and-forget” component, pre-lubricated at the factory with no provisions for regreasing. Regular inspection (listening for unusual noise, checking for play or heating) is the primary maintenance task.
Purchasing Information
Availability
The FAFNIR W209PP is readily available through:
- Authorized distributors (Timken, Applied, Motion Industries, Kaman)
- Online bearing supply stores
- Industrial supply retailers
- Automotive parts suppliers (sometimes under OEM part numbers)
Price Range
As of recent market data, prices typically range from:
- $25-$60 for genuine Timken/Fafnir W209PP bearings
- $20-$30 for new-old-stock or surplus bearings
- Potentially higher for special variants or custom specifications
Premium brands (SKF, FAG) offer equivalents at similar price points, while aftermarket options may be less expensive.
Conclusion
The FAFNIR W209PP ball bearing offers an excellent combination of load capacity, stability, and maintenance-free operation that makes it ideal for automotive, industrial, and agricultural applications. Its wide inner ring design provides enhanced shaft support in a compact package, while the double-sealed construction ensures long service life with minimal maintenance.
When selecting or replacing a W209PP bearing, pay close attention to dimensions, clearance specifications, and sealing type to ensure optimal performance in your specific application.
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