National 370450A Wheel Seal - Front Inner

National 370450A Wheel Seal Overview

National 370450A is an oil bath wheel seal built for driveline and axle sealing applications where consistent lubricant retention matters. It uses nitrile material and Redicoat protection to support a secure seal at the hub, housing bore, and shaft interface.

For buyers searching for a National wheel seal for axle service, this part number 370450A is sized for precise dimensional matching and is commonly referenced in wheel seal replacement searches for truck and trailer hub maintenance.

Key Features

• Wheel seal / oil bath seal for driveline and axle service
• Nitrile sealing material for dependable sealing performance
• Redicoat finish for improved installation and sealing surface protection
• Outside diameter: 3.880 in. (98.780 mm)
• Housing bore: 3.875 in. (98.430 mm)
• Shaft diameter: 2.875 in. (73.030 mm)
• Width: 0.414 in. (10.520 mm)
• Series 370000 design
• Installation tool reference: RD272

Detailed Description

National 370450A is a precision wheel seal designed for oil bath hub applications where the seal must maintain lubricant inside the assembly while helping keep contaminants out. The nitrile construction and Redicoat coating support a controlled fit at the housing bore and shaft diameter, making this part a practical choice for axle and hub seal replacement work. If you are searching for a National 370450A wheel seal for truck or trailer maintenance, the listed dimensions are the key reference points for confirming fitment before installation.

National has supplied sealing solutions for more than 75 years, and this part reflects that focus on dimensional accuracy and sealing-system design. It is a strong match for service work where the correct housing bore, shaft diameter, and seal width are critical to restoring proper wheel-end sealing. This part number 370450A is also commonly used in searches for National wheel seal replacement on axle and hub assemblies.

What This Part Helps Address

• Oil leakage at the wheel-end seal area
• Contamination entering the hub or axle assembly
• Seal wear from heat, friction, or age
• Improper sealing caused by dimensional mismatch
• Maintenance needs during hub or axle service

Installation Notes and Tips

Verify the housing bore, shaft diameter, outside diameter, and seal width against the existing component before installation. Use the specified installation tool RD272 when required for proper seating and to reduce the risk of seal damage. Clean the sealing surfaces thoroughly and inspect the hub and shaft for wear, scoring, or corrosion before installing National 370450A.

For fitment-based searches, use the exact vehicle application data supplied by your service information or parts catalog. This part number 370450A is often searched alongside make/model terms for axle and wheel-end repair, including National wheel seal replacement for truck and trailer service.

Quality Assurance

National is recognized for sealing products and has a long history in the aftermarket and service industry. The 370450A wheel seal is part of the 370000 series and is engineered around published dimensional specifications to support accurate replacement selection.