National 306-FF Wheel Bearing - Rear

National 306-FF Wheel Bearing Overview

The National 306-FF wheel bearing is a precision-engineered component designed for reliable driveline performance. Featuring a single row radial ball bearing design, this part ensures smooth rotation and durability for various vehicle applications, including popular makes and models such as Ford F-150 and Chevrolet Silverado.

• Single row radial ball bearing design for consistent load handling
• 30 mm (1.181 inch) bore diameter for precise fitment
• 72 mm (2.835 inch) outside diameter for compatibility with standard hubs
• 19 mm (0.748 inch) width for optimal balance and stability
• Inner and outer race radii of 1.02 mm (0.040 inch) to reduce stress concentrations

Technical Specifications and Design Details

The National 306-FF wheel bearing belongs to the 300 series and is classified as type A-9. It features a 30 mm (1.181 inch) inner race bore and a 72 mm (2.835 inch) outer race outside diameter, both with a 19 mm (0.748 inch) width. The single row radial design supports radial loads effectively, making it suitable for front and rear wheel applications on trucks and SUVs. The inner and outer race radii of 1.02 mm (0.040 inch) help minimize stress and extend bearing life under typical driving conditions.

Common Applications and Problem Solving

This wheel bearing is compatible with a range of vehicles, including Ford F-150 and Chevrolet Silverado models that require a 30 mm bore bearing. It addresses several common driveline issues:

• Eliminates wheel hub noise caused by worn or damaged bearings
• Reduces vibration and improves wheel stability
• Prevents premature wear of axle components
• Maintains proper wheel alignment and rotation
• Supports safe vehicle handling under load

Installation Notes and Tips

When installing the National 306-FF wheel bearing, ensure the hub and spindle surfaces are clean and free of debris. Use proper tools to press the bearing into place without applying excessive force that could damage the races. Verify the bearing is seated evenly and rotates smoothly before reassembling the wheel components. It is recommended to inspect related seals and replace them if necessary to maintain optimal performance.

Quality Assurance and Warranty

National wheel bearings are manufactured to meet industry standards for durability and precision. The 306-FF part number undergoes rigorous quality control to ensure consistent performance. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in the product's reliability.