National 375003A Wheel Seal - Rear Inner

Overview of National 375003A Wheel Seal

The National 375003A wheel seal is designed for reliable sealing in driveline and axle applications. Constructed from durable nitrile material, this oil bath seal ensures effective protection against contaminants and fluid leaks in compatible vehicle models.

• Part Number: 375003A
• Material: Nitrile for enhanced durability
• Housing Bore Diameter: 6.311 inches (160.300 mm)
• Outside Diameter: 6.331 inches (160.807 mm)
• Shaft Diameter: 4.765 inches (121.030 mm)
• Width: 1.078 inches (27.380 mm)
• Type: 11 oil bath seal
• Dynamic edge hand installable design
• Recommended Installation Tool: RD305

Detailed Product Description

The National 375003A wheel seal belongs to the 375000 series and is engineered to provide a secure seal in oil bath environments. Its nitrile construction offers resistance to heat, oil, and wear, making it suitable for heavy-duty automotive driveline and axle systems. The precise dimensions, including a housing bore of 6.311 inches and an outside diameter of 6.331 inches, ensure a proper fit for compatible shafts measuring 4.765 inches in diameter. The 1.078-inch width contributes to a robust sealing surface, reducing the risk of leaks and contamination.

Applications and Problem Solving

• Prevents oil leaks in axle and driveline assemblies
• Protects bearings and internal components from dirt and moisture
• Maintains lubrication integrity in oil bath systems
• Reduces wear caused by contaminants entering the seal area
• Supports consistent vehicle performance by preserving seal integrity

Installation Notes and Tips

The 375003A wheel seal features a dynamic edge that allows for hand installation, simplifying the replacement process. For optimal results, use the recommended RD305 installation tool to ensure proper seating and alignment within the housing bore. Care should be taken to avoid damage to the sealing lip during installation, and the mating surfaces should be clean and free of debris.

Quality Assurance and Warranty

Manufactured by National, a recognized brand in automotive sealing solutions, the 375003A wheel seal meets industry standards for durability and performance. The nitrile material and precise engineering contribute to a reliable seal life. Warranty details are subject to the original equipment manufacturer’s terms and conditions.