National 470625 Differential Pinion Seal - Rear Outer

Overview of National 470625 Differential Pinion Seal

The National 470625 differential pinion seal is engineered to provide reliable sealing performance for driveline and axle applications. Designed with precision, this oil seal helps maintain proper lubrication and prevents leaks in differential assemblies, making it suitable for various vehicle makes and models requiring a 1.500 inch shaft diameter.

• Inside diameter: 1.500 inches (38.100 mm)
• Outside diameter: 2.254 inches (57.250 mm)
• Thickness/width: 0.312 inches (7.920 mm)
• Material: Durable nitrile compound for resistance to oil and wear
• Redicoat coating for enhanced sealing and corrosion protection
• Housing bore compatibility: 2.250 inches (57.150 mm)
• Part number: 470625, series 470000
• Zero duplication part ensuring unique fit and quality

Technical Details and Material Specifications

This National differential pinion seal (part number 470625) is constructed from nitrile, a synthetic rubber known for its excellent resistance to petroleum-based oils and greases. The seal features a Redicoat surface treatment that improves sealing integrity and protects against corrosion in harsh operating environments. With an inside diameter of 1.500 inches and an outside diameter of 2.254 inches, it fits shafts and housings with precise tolerances, including a housing bore of 2.250 inches. The thickness of 0.312 inches ensures a secure fit within the differential assembly, minimizing the risk of leaks and contamination.

Applications and Problem Solving

This differential pinion seal is commonly used in automotive driveline and axle assemblies to address several issues:

• Prevents oil leaks from the differential pinion shaft
• Protects internal components from dirt and debris intrusion
• Maintains proper lubrication levels within the differential
• Reduces wear on the pinion shaft and bearings
• Helps avoid costly repairs due to seal failure or contamination

Installation Notes and Tips

For optimal performance, ensure the following during installation:

• Clean the housing bore and shaft thoroughly before installation
• Inspect the shaft for wear or damage that could affect seal seating
• Use appropriate tools to press the seal evenly into the housing bore
• Verify the seal lip is correctly oriented toward the lubricant side
• Apply a light coating of oil to the seal lip to reduce initial friction

Quality Assurance and Warranty

National manufactures the 470625 differential pinion seal to meet industry standards for durability and performance. This part is a zero duplication item, ensuring authenticity and consistent quality. While specific warranty details may vary, National typically backs its seals with a limited warranty against manufacturing defects, providing confidence in long-term reliability.