Timken 512003 Wheel Bearing and Hub Assembly - Rear

Timken 512003 Wheel Bearing and Hub Assembly Overview

The Timken 512003 wheel bearing and hub assembly is engineered for reliable performance in select Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac vehicles. Designed as a non-driven hub, this assembly ensures proper fitment and durability for models such as the Allante, Aurora, Bonneville, and more.

• Non-driven wheel bearing and hub assembly
• Flange bolt hole quantity: 4 for secure mounting
• Wheel pilot diameter: 2.760 inches (70.10 mm)
• Brake pilot diameter: 2.780 inches (70.60 mm)
• Hub pilot diameter: 2.827 inches (71.80 mm)
• Wheel stud quantity: 5 for compatibility with factory wheels
• Flange offset: 2.565 inches (65.14 mm)
• Flange diameter: 150.50 mm (5.925 inches)
• Bolt circle diameter: 115.00 mm (4.528 inches)

Detailed Product Description

The Timken 512003 wheel bearing and hub assembly is designed to meet the exact specifications required for non-driven wheel applications on various GM vehicles. With a 5-stud wheel configuration and a 4-bolt flange mounting, this assembly provides a precise fit for models including the Buick LeSabre, Cadillac DeVille, Chevrolet Malibu, and Pontiac Grand Am. The dual measurement system in both inches and millimeters for wheel pilot, brake pilot, and hub pilot diameters ensures compatibility with OEM components and proper alignment during installation. The flange offset and diameter are engineered to maintain correct wheel positioning and brake rotor clearance, contributing to vehicle stability and safety.

Common Applications and Problem Solving

• Replacement for worn or damaged wheel bearings causing noise or vibration
• Fixes wheel hub looseness or play affecting steering and handling
• Resolves uneven brake rotor wear due to improper hub alignment
• Addresses ABS sensor issues related to hub assembly failure (if applicable)
• Restores proper wheel mounting for Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac models

Installation Notes and Tips

• Ensure vehicle is securely lifted and supported before removal
• Verify the flange bolt hole quantity and wheel stud count match the vehicle specifications
• Clean mounting surfaces to prevent contamination and ensure proper fit
• Torque flange bolts to manufacturer specifications to avoid premature wear
• Check wheel pilot and hub pilot diameters for correct alignment during installation

Quality Assurance and Warranty

Timken wheel bearing and hub assemblies are manufactured to meet or exceed OEM standards for durability and performance. The 512003 part number undergoes rigorous quality control to ensure long service life and reliable operation. Timken typically offers a limited warranty covering defects in materials and workmanship; please refer to Timken's official warranty documentation for specific terms and conditions.