370001A Wheel Seal

The part number 370001A primarily refers to the National Seals 370001A Wheel Seal. This heavy-duty, unitized oil bath wheel seal is manufactured by Federal-Mogul, now under the Timken family. It is specifically engineered for the front steer axles of Class 6–8 commercial trucks and medium-duty vehicles.

Technical Specifications

• Component Type: Unitized Oil Bath Wheel Seal
• Shaft Diameter (Inner): 3.500 inches (88.90 mm)
• Housing Bore Diameter: 4.842 inches (122.99 mm)
• Outer Diameter: 4.855 to 4.873 inches (123.14 mm)
• Overall Width: 0.925 inches (23.50 mm)
• Material: Abrasion-resistant Nitrile rubber with a spring-loaded main lip
• Temperature Range: -40°F to 225°F (-40°C to 107°C)
• Installation Tool: National RD307
• Axle Rating: Designed for 12,000 lb front steer axles

Key Design Features

• Dynamic Edge® Technology: Utilizes a sinusoidal wave pattern that actively pushes dirt, moisture, and road contaminants away from the seal face.
• SURE-LOCK® Ribs: Built-in rubber inner and outer diameter ribs prevent fluid bypass along the shaft or through minor hub bore imperfections.
• Unitized Construction: Self-contained components maximize structural integrity and protect the delicate main sealing lip during installation.

⚠️ Warning

This product can expose you to chemicals including Lead and lead compounds, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.