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National 370199A Wheel Seal - Front or Front Inner
Wheel Seal for Oil Bath Hub Service
The National 370199A wheel seal is an oil bath seal built for driveline and axle sealing applications that require a precise housing bore and shaft diameter match. It uses nitrile material for sealing performance in hub environments and is specified with a spindle mount design.
For service work on Chevrolet Silverado and GMC Sierra applications, this seal supports accurate replacement when the original wheel seal is worn, leaking, or contaminated. National 370199A is part of the 370000 series and is engineered around the dimensions needed for a proper hub seal fit.
Key Features
- Wheel seal / oil bath seal for hub and axle sealing service
- National part number 370199A
- Nitrile sealing material
- Spindle mount footnote
- Outside diameter: 3.948 in. / 100.380 mm
- Housing bore: 3.938 in. / 100.030 mm
- Shaft diameter: 2.359 in. / 59.920 mm
- Width: 0.575 in. / 14.610 mm
- Installation tool reference: RD315
Detailed Description
National 370199A is a wheel seal designed for oil bath hub assemblies where dimensional accuracy matters. The seal’s nitrile construction is selected for sealing service in driveline and axle environments, while the listed housing bore, outside diameter, shaft diameter, and width help confirm proper application matching before installation. This part cross-references Febi-Bilstein 23590 for the same application.
When servicing Chevrolet Silverado or GMC Sierra wheel-end components, matching the seal dimensions to the hub and spindle interface helps restore sealing integrity and reduce contamination at the bearing area. National has supplied sealing solutions for decades, and this part reflects that focus on replacement sealing components for modern vehicles.
What It Helps Address
- Oil leakage at the wheel-end seal area
- Contamination entering the hub or bearing cavity
- Seal wear from age, heat, or road exposure
- Loss of sealing performance in oil bath hub service
- Fitment issues caused by incorrect seal dimensions
Installation Notes and Tips
Verify housing bore, outside diameter, shaft diameter, and width before installation. Use the specified RD315 installation tool where required to help seat the seal evenly and avoid damage to the sealing lip or case. Clean the spindle and housing surfaces thoroughly, and inspect the hub components for wear or scoring before installing the new seal.
Quality Assurance
National has built its sealing product line around long-term aftermarket and OE-style service needs, with more than 75 years of experience in sealing solutions. National 370199A is manufactured to support accurate replacement in wheel-end oil bath applications.
| Brand | National |
|---|---|
| Part Number | 370199A |
| Width | 0.575 |
| Width | 14.610 |
| Outside Diameter | 100.380 |
| Outside Diameter | 3.948 |
| Housing Bore | 100.030 |
| Housing Bore | 3.938 |
| Footnote | Spindle mount |
| Housing Bore (Inch) | 3.938 |
| Housing Bore (MM) | 100.030 |
| Installation Tool | Rd315 |
| Material | Nitrile |
| Outside Diameter (Inch) | 3.948 |
| Outside Diameter (mm) | 100.380 |
| Part Description | Oil bath seal |
| Series | 370000 |
| Shaft (Inch) | 2.359 |
| Shaft (MM) | 59.920 |
| Shaft Diameter | 2.359 |
| Shaft Diameter | 59.920 |
| Type | 11 |
| Unit of Dimension | Inch |
| Width (Inch) | 0.575 |
| Width (mm) | 14.610 |
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.