National 480991 Wheel Seal - Front Inner

National 480991 Wheel Seal Overview

The National 480991 wheel seal is engineered to provide reliable sealing performance for driveline and axle applications. Designed with precision, this oil seal features nitrile material construction and a redicoat finish to enhance durability and resistance to wear.

• Inside diameter: 1.500 inches (38.100 mm)
• Outside diameter: 2.066 inches (52.480 mm)
• Housing bore: 2.062 inches (52.370 mm)
• Width: 0.375 inches (9.530 mm)
• Material: Nitrile with redicoat coating
• Series: 480000, Type 48

Technical Details and Material Specifications

This National wheel seal (part number 480991) is constructed from nitrile, a synthetic rubber known for its resistance to oil, heat, and abrasion. The redicoat finish provides an additional protective layer that helps reduce friction and extend the seal’s service life. With precise dimensions including a 1.500-inch shaft diameter and a 2.066-inch outside diameter, this seal is designed to fit securely within the housing bore of 2.062 inches, ensuring a tight seal to prevent oil leaks and contamination.

Applications and Problem Solving

The National 480991 wheel seal is commonly used in automotive driveline and axle assemblies, particularly in vehicles requiring a reliable oil seal to maintain lubrication and protect components from dirt and moisture. This part is compatible with various makes and models that utilize a 1.500-inch shaft diameter and corresponding housing bore dimensions.

• Prevents oil leakage from axle assemblies
• Protects bearings and internal components from dirt and debris
• Reduces wear caused by contaminants and moisture
• Maintains proper lubrication within the driveline system
• Helps avoid costly repairs due to seal failure

Installation Notes and Tips

When installing the National 480991 wheel seal, ensure the housing bore and shaft are clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the sealing lip or the redicoat surface. Verify the seal orientation matches the original installation to maintain optimal sealing performance. Lubricate the seal lip lightly with compatible oil before installation to reduce initial wear.

Quality Assurance and Warranty

National wheel seals are manufactured to meet industry standards for durability and performance. The 480991 part number undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in the product’s reliability.