National 41787S Wheel Seal - Rear

National 41787S Wheel Seal Overview

The National 41787S wheel seal is engineered for reliable driveline performance, designed to maintain proper lubrication and prevent contamination. This oil seal is suitable for applications requiring precise fitment with a 1.250 inch shaft diameter and a 2.066 inch outside diameter.

• Inside diameter: 1.250 inches (31.750 mm)
• Outside diameter: 2.066 inches (52.480 mm)
• Width: 0.250 inches (6.350 mm)
• Material: Durable nitrile for resistance to oil and wear
• Series: 40000, Type: 4s oil seal
• Housing bore: 2.062 inches (52.370 mm)

Technical Details and Specifications

The National 41787S wheel seal is constructed from nitrile, a synthetic rubber known for its excellent resistance to petroleum-based oils and high temperatures. The seal’s dimensions include a 1.250 inch (31.750 mm) shaft diameter and a 2.066 inch (52.480 mm) outside diameter, making it compatible with specific driveline and axle assemblies. The 0.250 inch (6.350 mm) width ensures a secure fit within the housing bore of 2.062 inches (52.370 mm). This 4s type oil seal from the 40000 series is designed to provide effective sealing against oil leaks and contaminants in automotive wheel hubs.

Applications and Problem Solving

• Prevents oil leakage in wheel hubs and axle assemblies
• Protects driveline components from dirt, dust, and moisture intrusion
• Maintains lubrication integrity for extended component life
• Reduces wear on bearings and shafts by sealing contaminants out
• Compatible with various vehicle makes and models requiring a 1.250 inch shaft seal

Installation Notes and Tips

• Ensure the housing bore and shaft are clean and free of debris before installation
• Use appropriate tools to press the seal evenly into the housing bore to avoid damage
• Verify the seal orientation matches the oil side to prevent leaks
• Check shaft surface for wear or damage that could compromise seal performance
• Lubricate the seal lip lightly with compatible oil before installation

Quality Assurance and Warranty

National wheel seals, including the 41787S, are manufactured to meet industry standards for durability and performance. The nitrile material and precise dimensions ensure consistent sealing under typical operating conditions. While specific warranty details may vary, National products generally come with a limited warranty against manufacturing defects, providing confidence in the product’s reliability for automotive driveline applications.