National HD203 Wheel Bearing and Race Set - Rear Inner

National HD203 Wheel Bearing and Race Set Overview

The National HD203 wheel bearing and race set is designed for precise fitment and reliable performance in driveline and axle applications. This taper bearing set features specific dimensions to ensure compatibility with select vehicle makes and models requiring a 3.75-inch cone bore and 6-inch cup bore.

• Taper bearing cone part number 594a and cup part number 592a
• Cone bore diameter: 3.7500 inches (95.25 mm)
• Cone length: 1.4300 inches (36.322 mm)
• Cone radius: 0.2030 inches (5.156 mm)
• Cup bore diameter: 6.0000 inches (152.4 mm)
• Cup length: 1.1875 inches (30.163 mm)
• Cup radius: 0.1250 inches (3.175 mm)
• Overall width: 1.5625 inches (39.688 mm)
• Standout dimension: 0.3750 inches (9.525 mm)

Detailed Product Description

The National HD203 is a precision-engineered taper bearing set designed to meet the exacting standards of driveline and axle wheel bearing applications. The cone and cup components are manufactured to tight tolerances, with a cone bore of 3.75 inches and a cup bore of 6 inches, making this set suitable for vehicles requiring these specific dimensions. The cone length of 1.43 inches and cup length of 1.1875 inches provide the necessary bearing surface for smooth rotation and load distribution. The standout measurement of 0.375 inches ensures proper seating and alignment within the hub assembly. This wheel bearing and race set is compatible with various vehicle makes and models that specify the National HD203 part number for their driveline maintenance and repair needs.

Common Applications and Problem Solving

• Replacement for worn or damaged wheel bearings in compatible vehicles
• Eliminates wheel hub noise caused by bearing wear
• Restores proper wheel alignment and rotation smoothness
• Prevents premature axle and hub assembly wear
• Addresses vibration issues related to bearing failure

Installation Notes and Tips

Ensure the hub and spindle surfaces are clean and free of debris before installation. Use proper tools to press the cone and cup into place without damaging the bearing surfaces. Verify the standout dimension of 0.375 inches to confirm correct bearing preload. It is recommended to check vehicle-specific service manuals for torque specifications and installation procedures to maintain safety and performance standards.

Quality Assurance and Warranty

National wheel bearing and race sets are manufactured to meet industry standards for durability and performance. The HD203 part number undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details are not provided, National products typically come with a limited warranty against defects in materials and workmanship. Consult the product documentation or manufacturer for exact warranty terms.