National 6781 Wheel Seal - Front Inner

Overview of National 6781 Wheel Seal

The National 6781 wheel seal is designed to provide reliable sealing performance for driveline and axle applications. Crafted from durable leather material, this oil seal ensures effective protection against contaminants and fluid leaks in compatible vehicle models.

• Inside diameter: 1.796 inches (45.620 mm)
• Outside diameter: 2.730 inches (69.340 mm)
• Housing bore: 2.725 inches (69.220 mm)
• Width: 0.500 inches (12.700 mm)
• Material: Leather
• Series: 6000
• Type: 201 oil seal

Detailed Product Description

The National 6781 wheel seal is part of the 6000 series and is constructed from high-quality leather, providing a balance of flexibility and durability. With an inside diameter of 1.796 inches and an outside diameter of 2.730 inches, this seal fits shafts measuring 1.796 inches and housing bores around 2.725 inches. The 0.500-inch width ensures a secure fit within the axle assembly, helping to maintain proper lubrication and prevent dirt and moisture intrusion. This oil seal is engineered to meet the demands of various driveline and axle systems, making it suitable for use in specific vehicle makes and models requiring these precise dimensions.

Common Applications and Issues Addressed

• Prevents oil leaks in wheel hubs and axle assemblies
• Protects bearings from dirt, dust, and moisture contamination
• Maintains proper lubrication within driveline components
• Reduces wear and extends the service life of axle parts
• Helps avoid costly repairs due to seal failure or leakage

Installation Notes and Tips

• Ensure the shaft and housing bore are clean and free of debris before installation
• Use appropriate tools to avoid damaging the leather seal during fitting
• Verify the seal orientation matches the oil seal type 201 specifications
• Apply a light coating of lubricant on the seal lip to facilitate installation
• Check for proper seating to prevent leaks and premature wear

Quality Assurance and Warranty

National wheel seals, including part number 6781, are manufactured to meet industry standards for durability and performance. The leather material and precise dimensions ensure consistent sealing capability. While specific warranty details may vary, National typically offers coverage against manufacturing defects to support product reliability in automotive driveline applications.