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National 40566S Wheel Seal - Front Inner
National 40566S Wheel Seal Overview
The National 40566S wheel seal is an OE-style sealing solution for driveline and axle service. Built with nitrile material and sized for a 2.125 in. shaft and 2.875 in. housing bore, it is made for applications that require controlled sealing at the wheel end.
National has supplied sealing products for more than 75 years, and this 40566S oil seal reflects that focus on dimensional accuracy and modern vehicle service needs. It is a practical choice for wheel seal replacement on vehicles such as Honda Civic and Toyota Corolla applications where the correct seal dimensions are critical.
Key Features
- Part number: 40566S
- Wheel seal / oil seal for driveline and axle sealing service
- Nitrile construction for sealing performance
- Inside diameter: 2.125 in. (53.980 mm)
- Outside diameter: 2.879 in. (73.130 mm)
- Housing bore: 2.875 in. (73.030 mm)
- Width: 0.250 in. (6.350 mm)
- Series: 40000, Type: 4S
Detailed Description
The National 40566S is a wheel seal in National’s 40000 series, engineered with nitrile and standard inch dimensions for accurate fitment in the housing bore and on the shaft. Its 2.125 in. shaft size, 2.879 in. outside diameter, and 0.250 in. width make it a dimension-driven replacement part for axle and wheel-end sealing service. This part cross-references Bosch 17004 and Wix 49530 for the same application. For buyers searching for a National 40566S wheel seal for Honda Civic or Toyota Corolla service, matching the seal dimensions to the original specification is the key step.
Common Uses
- Replacing a worn or hardened wheel seal
- Addressing grease or oil leakage at the wheel end
- Restoring sealing performance after axle or hub service
- Reducing contamination entry into the sealed area
- Correcting seal wear caused by age, heat, or mileage
Installation Notes and Tips
Verify shaft diameter, housing bore, outside diameter, and width before installation. Inspect the sealing surface for scoring or corrosion, and clean the bore thoroughly so the seal seats evenly. Use proper installation tools to avoid distorting the nitrile sealing lip or damaging the seal case. Confirm the replacement matches the vehicle’s original wheel seal dimensions before final assembly.
Quality Assurance
National has a long history in sealing technology and continues to supply replacement seals for current vehicle service requirements. The 40566S is built as a precision sealing component for driveline and axle applications, with dimensions and material selection intended to support consistent fit and sealing performance.
| Brand | National |
|---|---|
| Part Number | 40566S |
| Housing Bore (Inch) | 2.875 |
| Housing Bore (MM) | 73.030 |
| Inside Diameter | 2.125 |
| Inside Diameter | 53.980 |
| Material | Nitrile |
| Outside Diameter | 2.879 |
| Outside Diameter | 73.130 |
| Outside Diameter (Inch) | 2.879 |
| Outside Diameter (mm) | 73.130 |
| Part Description | Oil Seal |
| Series | 40000 |
| Shaft (Inch) | 2.125 |
| Shaft (MM) | 53.980 |
| Type | 4S |
| Unit of Dimension | Inch |
| Width (Inch) | 0.250 |
| Width (mm) | 6.350 |
This part fits 0 vehicles. Search below:
| Year | Make | Model | Position | Notes |
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* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.