National 380003A Wheel Seal - Rear or Rear Inner

National 380003A Wheel Seal Overview

The National 380003A wheel seal is engineered for reliable driveline performance, designed to maintain optimal sealing in oil bath applications. Constructed with durable PTFE material, this wheel seal offers precise dimensions to fit specific axle housings and shafts, ensuring effective protection against contaminants and fluid leaks.

• PTFE material for enhanced durability and chemical resistance
• Outside diameter: 160.48 mm (6.322 inches)
• Housing bore diameter: 160.3 mm (6.309 inches)
• Shaft diameter compatibility: 121.03 mm (4.765 inches)
• Seal width: 28.75 mm (1.132 inches)
• Designed for oil bath sealing applications
• Compatible installation tool: RD305

Detailed Product Description

The National 380003A wheel seal is part of the 380000 series, specifically designed to provide a secure seal between the axle shaft and housing bore. Its PTFE construction offers resistance to wear and chemical degradation, making it suitable for demanding automotive driveline environments. The seal’s precise dimensions—160.48 mm outside diameter and 28.75 mm width—ensure a tight fit within the axle housing bore of 160.3 mm, while accommodating a shaft diameter of 121.03 mm. This design helps maintain oil bath integrity, preventing leakage and contamination that can lead to premature component failure.

Applications and Problem Solving

• Prevents oil leaks in axle assemblies
• Protects driveline components from dirt and debris ingress
• Reduces wear on axle shafts by maintaining proper lubrication
• Helps maintain consistent oil bath conditions for extended component life
• Addresses common seal failure issues in compatible vehicle models

Installation Notes and Tips

For proper installation of the National 380003A wheel seal, use the RD305 installation tool to ensure even seating and avoid damage to the seal lip. Verify shaft and housing bore dimensions before installation to confirm compatibility. Clean the installation area thoroughly to remove debris and old sealant residues. Lubricate the seal lip lightly with compatible oil to facilitate smooth installation and initial operation.

Quality Assurance and Warranty

National wheel seals are manufactured to meet stringent quality standards, ensuring reliable performance in automotive driveline applications. The 380003A part number undergoes rigorous testing for dimensional accuracy and material integrity. While specific warranty details are not provided, National products typically adhere to industry standards for durability and fitment reliability.