National 6420 Wheel Bearing Race - Front Inner

National 6420 Wheel Bearing Race Overview

The National 6420 wheel bearing race is a precision-engineered taper bearing cup designed for driveline and axle applications. With exact dimensions including a 5.8750 inch (149.225 mm) cup bore and a 1.7500 inch (44.450 mm) cup length, this component ensures proper fit and function in compatible vehicles.

• Taper bearing cup with a 5.8750 inch (149.225 mm) cup bore
• 1.7500 inch (44.450 mm) cup length for accurate seating
• 0.1250 inch (3.175 mm) cup radius for smooth bearing operation
• Part number 6420 for precise identification and replacement
• Designed for driveline and axle wheel bearing assemblies

Detailed Product Description

The National 6420 wheel bearing race is manufactured to meet strict dimensional tolerances, featuring a cup bore diameter of 5.8750 inches (149.225 mm) and a cup length of 1.7500 inches (44.450 mm). The taper bearing cup design includes a cup radius of 0.1250 inches (3.175 mm), which supports the bearing rollers and helps maintain proper alignment under load. This part is essential for maintaining the integrity of the wheel bearing assembly in various driveline and axle configurations. The National brand is recognized for producing reliable components that meet OEM specifications, making part number 6420 a suitable replacement for vehicles requiring this specific taper bearing cup size.

Compatible Vehicles and Applications

This wheel bearing race is compatible with a range of vehicles that utilize a 5.8750 inch cup bore taper bearing cup in their driveline or axle assemblies. Commonly found in certain Ford, Chevrolet, and Dodge truck models, the National 6420 is used in applications where precise bearing fitment is critical for wheel hub performance and longevity.

• Replaces worn or damaged taper bearing cups in wheel bearing assemblies
• Addresses issues such as wheel bearing noise or rough rotation
• Prevents premature bearing wear caused by improper cup dimensions
• Helps eliminate wheel hub play and vibration
• Restores proper bearing preload and alignment

Installation Notes and Tips

When installing the National 6420 wheel bearing race, ensure the cup bore and length dimensions match the vehicle’s specifications. Proper seating of the taper bearing cup is critical; use a bearing race driver or press to avoid damage. Clean the hub bore thoroughly before installation to prevent contamination. Verify the cup radius matches the bearing rollers to maintain smooth operation. Follow vehicle-specific service manual instructions for torque specifications and bearing preload adjustments.

Quality Assurance and Warranty

National manufactures the 6420 wheel bearing race to meet or exceed OEM standards, ensuring durability and reliable performance. While specific warranty details are not provided, National parts typically come with a limited warranty against defects in material and workmanship. For best results, use this part as a direct replacement in compatible driveline and axle assemblies.