National 516003 Wheel Bearing - Rear Inner

Overview of National 516003 Wheel Bearing for Saab and Subaru

The National 516003 wheel bearing is engineered for reliable driveline performance in select Saab and Subaru vehicles. Designed to meet precise specifications, this wheel bearing supports smooth wheel rotation and helps maintain vehicle stability.

• Compatible with Saab 9-2X and Subaru Impreza models
• Bore diameter of approximately 1.654 inches (42 mm)
• Cone length of 2.047 inches (52 mm) and cup length of 1.89 inches (48 mm)
• Outside diameter measures 2.835 inches (72 mm)
• Outer race width of 1.89 inches (48 mm) for proper fitment
• Gen1 design for consistent performance

Technical Specifications and Design Details

The National 516003 wheel bearing features a bore size of 1.6535 to 1.654 inches (42 mm), ensuring a precise fit on the axle shaft. The cone length is 2.0472 inches (52 mm), while the cup length is 1.8898 inches (48 mm), providing the correct axial spacing for the bearing assembly. The outside diameter is 2.8346 to 2.835 inches (72 mm), and the outer race width is 1.89 inches (48 mm), matching OEM dimensions for the Saab 9-2X and Subaru Impreza. This Gen1 design bearing is part of the 516000 series, built to maintain wheel alignment and reduce friction under normal driving conditions.

Applications and Problem Resolution

This wheel bearing is specifically compatible with the Saab 9-2X and Subaru Impreza, making it suitable for owners seeking replacement parts that meet factory specifications. It addresses common driveline issues such as:

• Excessive wheel play or looseness
• Unusual noise or grinding from the wheel area
• Vibration or wobbling during vehicle operation
• Uneven tire wear caused by bearing failure
• Reduced steering responsiveness linked to bearing wear

Installation Notes and Tips

Proper installation of the National 516003 wheel bearing requires attention to detail to ensure optimal performance. It is recommended to:

• Clean the hub and spindle thoroughly before installation
• Use appropriate tools to press the bearing without causing damage
• Verify the bearing orientation matches OEM specifications
• Check for proper torque on retaining components
• Inspect related seals and replace if necessary to prevent contamination

Quality Assurance and Warranty Information

National wheel bearings are manufactured to meet industry standards for durability and precision. The 516003 part number undergoes rigorous quality control to ensure consistent fit and function. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in the product's reliability for Saab 9-2X and Subaru Impreza applications.