National 12520 Wheel Bearing Race - Front Outer

National 12520 Wheel Bearing Race Overview

The National 12520 wheel bearing race is a precision-engineered taper bearing cup designed for driveline and axle applications. With exact dimensions including a cup bore of 1.9380 inches (49.225 mm) and a cup length of 0.6250 inches (15.875 mm), this component ensures proper fit and function in compatible vehicles.

• Brand: National
• Part Number: 12520
• Category: Wheel Bearing Race (Taper Bearing Cup)
• Cup Bore: 1.9380 inches (49.225 mm)
• Cup Length: 0.6250 inches (15.875 mm)
• Cup Radius: 0.0620 inches (1.575 mm)

Technical Specifications and Features

The National 12520 taper bearing cup is manufactured to meet strict dimensional tolerances, ensuring compatibility with specific wheel bearing assemblies. The cup bore diameter of 1.9380 inches allows for a secure fit with the corresponding cone bearing, while the cup length of 0.6250 inches provides adequate surface area for load distribution. The cup radius of 0.0620 inches helps maintain proper seating and reduces stress concentrations during operation.

Applications and Vehicle Compatibility

This wheel bearing race is commonly used in driveline and axle assemblies for various vehicle makes and models requiring a taper bearing cup with these precise dimensions. While specific fitment depends on the vehicle’s axle and bearing configuration, the National 12520 is compatible with many domestic and import vehicles that specify a 1.9380 inch cup bore and 0.6250 inch cup length. It is important to verify fitment with your vehicle’s service manual or parts catalog before installation.

• Replaces worn or damaged taper bearing cups
• Addresses wheel bearing noise and roughness
• Prevents premature bearing failure due to improper seating
• Restores proper axle end play and bearing preload
• Eliminates vibration and uneven tire wear caused by bearing issues

Installation Notes and Tips

Proper installation of the National 12520 wheel bearing race requires the use of appropriate tools such as a bearing race driver or press to avoid damage. Clean the axle housing bore thoroughly before installation to ensure a secure fit. Verify that the race is fully seated and flush with the housing surface. Lubricate the bearing surfaces as recommended by the vehicle manufacturer. Always consult the vehicle’s service manual for torque specifications and installation procedures.

Quality Assurance and Warranty

National manufactures the 12520 wheel bearing race to meet industry standards for durability and performance. Each part undergoes quality control inspections to ensure dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers limited warranties against defects in material and workmanship. Refer to the product documentation or contact the manufacturer for warranty terms applicable to this part.