National 370046A Wheel Seal - Rear Inner

National 370046A Wheel Seal Overview

The National 370046A wheel seal is an oil bath seal built for driveline and axle sealing applications that require precise shaft and housing dimensions. It uses nitrile material with Redicoat protection and is part of National’s 370000 series, a sealing line backed by more than 75 years of industry experience.

For buyers searching for a wheel seal for axle service, oil bath seal replacement, or a National 370046A cross reference, this part is specified with a 3.125 inch shaft diameter, 4.625 inch housing bore, and 4.631 inch outside diameter. It is also listed with installation tool RD273 for proper service setup.

Key Features

• Wheel seal / oil bath seal for driveline and axle sealing service
• Nitrile sealing material for common axle and hub applications
• Redicoat finish for added sealing surface protection
• 3.125 inch shaft diameter and 4.625 inch housing bore
• 4.631 inch outside diameter and 0.605 inch width
• National 370046A part number for direct catalog lookup

Detailed Product Description

National 370046A is a wheel seal designed around exact dimensional requirements: 79.380 mm shaft diameter, 117.480 mm housing bore, 117.630 mm outside diameter, and 15.370 mm width. Those measurements matter when replacing an axle seal or oil bath seal in service work where the seal must seat correctly in the housing and run on the shaft surface without leakage.

This part cross-references Dorman - HELP 47877 for the same application. It is also commonly searched as a National 370046A wheel seal for axle and hub sealing service on vehicles such as Ford F-150 and Ford Bronco when matching the listed application requirements.

What This Part Helps Address

• Gear oil or lubricant seepage at the wheel end
• Contamination entering the hub or axle sealing area
• Worn or hardened seal lips from age and heat
• Incorrect seal fit from mismatched housing bore or shaft diameter
• Service replacement needs for oil bath seal applications

Installation Notes and Tips

Verify the shaft diameter, housing bore, outside diameter, and width before installation. Use installation tool RD273 where specified to help seat the seal evenly and avoid damage to the sealing lip or case. Clean the bore and shaft surface thoroughly before assembly, and confirm the seal orientation matches the axle or hub design.

Because wheel seal applications can vary by axle and hub configuration, confirm the vehicle’s service dimensions before ordering. This is especially important when sourcing a wheel seal for Ford F-150 or Ford Bronco axle service, or when comparing National 370046A against other cross-reference numbers.

Quality Assurance

National has built its reputation on premium sealing solutions for more than 75 years, and this part reflects that focus on dimensional accuracy and modern sealing design. The 370046A is part of the National 370000 series and uses Redicoat and nitrile construction for sealing performance in demanding driveline and axle environments.