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National 370023A Wheel Seal - Rear Inner
National 370023A Wheel Seal Overview
National 370023A is an oil bath wheel seal built for driveline and axle sealing applications that demand accurate dimensions and durable sealing performance. It uses nitrile material and National’s Dynamic Edge design to help maintain a reliable seal in service.
With a 3.875 inch shaft diameter, 5.704 inch outside diameter, and 5.689 inch housing bore, this seal is sized for precise wheel-end fitment. It is a strong match for buyers searching for a National wheel seal, oil bath seal, or 370023A replacement for axle and hub service.
Key Features
- National 370023A wheel seal for oil bath applications
- Nitrile sealing material for dependable fluid control
- Dynamic Edge footnote design
- Outside diameter: 5.704 in. / 144.930 mm
- Housing bore: 5.689 in. / 144.530 mm
- Shaft diameter: 3.875 in. / 98.430 mm
- Width: 0.880 in. / 22.230 mm
- Series 370000 construction
Detailed Description
National has focused on sealing solutions for more than 75 years, and the 370023A reflects that experience in a wheel-end oil bath seal. The nitrile construction is selected for sealing performance in driveline and axle environments, while the listed dimensions help ensure proper housing and shaft fitment during service. This part cross-references Monroe Shocks & Struts 40210 and Timken 11S38751 for the same application.
For technicians and parts buyers searching for wheel seal replacement parts for Ford truck and axle service, National 370023A provides a direct reference point by size and design. It is also a practical option when matching National 370023A against interchange numbers during hub, axle, or wheel-end maintenance.
Common Problems This Seal Can Address
- Oil leakage at the wheel end
- Contamination entering the hub or axle area
- Seal wear from age, heat, or mileage
- Loss of sealing integrity during oil bath service
- Fitment issues when replacing a worn wheel seal
Installation Notes and Tips
Verify shaft diameter, housing bore, outside diameter, and width before installation. Use the specified installation tool RD309 for proper handling and seating, and inspect the sealing surface for scoring, corrosion, or debris before assembly. Clean the hub and axle area thoroughly so the new seal can seat evenly and maintain contact.
For fitment-based searches, this seal is commonly referenced for Ford truck wheel seal replacement and related axle service applications. Confirm dimensions against the original part number 370023A and the vehicle service information before installation.
Quality Assurance
National is known for premium sealing solutions and long-standing engineering support in the aftermarket. The 370023A wheel seal is built to National’s dimensional and material standards for wheel-end sealing service.
| Brand | National |
|---|---|
| Part Number | 370023A |
| Width | 0.880 |
| Width | 22.230 |
| Outside Diameter | 144.930 |
| Outside Diameter | 5.704 |
| Housing Bore | 144.530 |
| Housing Bore | 5.689 |
| Footnote | Dynamic edge |
| Housing Bore (Inch) | 5.689 |
| Housing Bore (MM) | 144.530 |
| Installation Tool | Rd309 |
| Material | Nitrile |
| Outside Diameter (Inch) | 5.704 |
| Outside Diameter (mm) | 144.930 |
| Part Description | Oil bath seal |
| Series | 370000 |
| Shaft (Inch) | 3.875 |
| Shaft (MM) | 98.430 |
| Shaft Diameter | 3.875 |
| Shaft Diameter | 98.430 |
| Type | 11 |
| Unit of Dimension | Inch |
| Width (Inch) | 0.880 |
| Width (mm) | 22.230 |
This part fits 0 vehicles. Search below:
| Year | Make | Model | Position | Notes |
|---|
* 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.