National 370003A Wheel Seal - Rear Inner

Overview of National 370003A Wheel Seal

The National 370003A wheel seal is engineered for reliable driveline protection in various vehicle applications. Designed with nitrile material and a dynamic edge, this oil bath seal ensures effective sealing performance for axle shafts, helping maintain optimal lubrication and prevent contamination.

• Part Number: 370003A
• Material: Durable nitrile for resistance to oil and wear
• Type: Oil bath wheel seal with dynamic edge design
• Outside Diameter: 160.48 mm (6.325 inches)
• Housing Bore: 160.3 mm (6.311 inches)
• Shaft Diameter: 121.03 mm (4.765 inches)
• Width: 27.38 mm (1.078 inches)
• Installation Tool Recommended: RD305

Detailed Product Description

The National 370003A wheel seal is part of the 370000 series, designed specifically for driveline and axle sealing systems. Constructed from nitrile, this seal offers excellent resistance to oil, heat, and wear, making it suitable for demanding automotive environments. The dynamic edge design enhances sealing efficiency by maintaining a tight barrier against contaminants while retaining lubricants within the axle housing bore. With precise dimensions including a 160.48 mm outside diameter and a 121.03 mm shaft diameter, this seal fits applications requiring these exact measurements, commonly found in medium to heavy-duty trucks and commercial vehicles.

Common Applications and Problem Solving

• Prevents axle oil leaks that can lead to driveline damage
• Protects wheel bearings from dirt, water, and debris intrusion
• Maintains proper lubrication within the axle housing
• Reduces risk of premature bearing failure due to contamination
• Ensures consistent performance in oil bath axle systems

Installation Notes and Tips

For optimal installation of the National 370003A wheel seal, use the recommended RD305 installation tool to avoid damage to the seal lip and ensure proper seating within the housing bore. Clean the shaft and housing bore thoroughly before installation to remove any debris or old sealant. Verify the shaft diameter and housing bore dimensions match the seal specifications to ensure compatibility. Avoid excessive force during installation to maintain the integrity of the nitrile material and dynamic edge design.

Quality Assurance and Warranty

National wheel seals are manufactured to meet stringent quality standards for durability and performance in automotive driveline applications. The 370003A seal undergoes rigorous testing to ensure resistance to oil degradation and mechanical wear. While specific warranty details are not provided, National products typically come with manufacturer-backed quality assurance to support reliable service life when installed and maintained properly.