National 204005 Steering Knuckle Seal - Front

Overview of National Steering Knuckle Seal 204005

The National Steering Knuckle Seal 204005 is engineered to provide reliable sealing performance for steering components in select Chevrolet, Ford, and GMC vehicles. Designed with precision dimensions and durable nitrile material, this oil seal helps maintain proper lubrication and prevent contamination in the steering knuckle assembly.

• Housing Bore Diameter: 1.780 inches (45.210 mm)
• Outside Diameter: 1.785 inches (45.340 mm)
• Shaft Diameter: 1.000 inch (25.400 mm)
• Seal Width: 0.468 inch (11.890 mm)
• Material: Nitrile for resistance to oil and wear
• Part Number: 204005, Series 204000

Detailed Product Description

This National steering knuckle seal (part number 204005) is constructed from nitrile, a synthetic rubber known for its excellent resistance to petroleum-based fluids and abrasion. The seal features a housing bore of 1.780 inches and an outside diameter of 1.785 inches, ensuring a precise fit within the steering knuckle assembly. With a shaft diameter of 1.000 inch and a width of 0.468 inch, this oil seal is designed to maintain a tight barrier against contaminants while retaining lubricants essential for smooth steering operation.

Compatible with a range of Chevrolet, Ford, and GMC models including Blazer, Bronco, F-100, F-250, F-350, Jimmy, K5 Blazer, K10, K10 Suburban, K20, and K20 Suburban, this seal supports the integrity of the steering system in these vehicles. The 204005 seal is part of National's 204000 series, known for consistent quality and fitment in steering gasket and sealing applications.

Common Applications and Problem Solving

• Prevents oil leaks from the steering knuckle housing
• Protects steering components from dirt and debris intrusion
• Maintains proper lubrication for steering shaft and bearings
• Reduces wear and extends the life of steering assemblies
• Helps eliminate steering noise caused by seal failure

Installation Notes and Tips

• Ensure the steering knuckle bore is clean and free of debris before installation
• Use appropriate tools to press the seal evenly into the housing bore without distortion
• Verify shaft and bore dimensions match the seal specifications for proper fit
• Lubricate the seal lip lightly with compatible oil before installation to prevent dry running
• Inspect the steering knuckle and shaft for damage or wear prior to seal replacement

Quality Assurance and Warranty

National steering knuckle seal 204005 is manufactured to meet industry standards for durability and performance. The nitrile material and precise dimensional tolerances ensure reliable sealing under typical operating conditions. While specific warranty details may vary, National products generally come with a limited warranty against defects in material and workmanship. Always consult product documentation or the manufacturer for exact warranty terms.