Timken HA590066 Wheel Bearing and Hub Assembly - Rear

Timken HA590066 Wheel Bearing and Hub Assembly Overview

The Timken HA590066 wheel bearing and hub assembly is engineered for reliable performance in select Chevrolet, Pontiac, and Saturn vehicles. Designed as a non-driven hub, this assembly ensures precise fitment and durability for models including the Chevrolet Cobalt, Pontiac G5, and Saturn Ion.

• Flange bolt hole quantity: 4 for secure mounting
• Wheel pilot diameter: 2.224 inches (56.49 mm)
• Brake pilot diameter: 2.243 inches (56.96 mm)
• Wheel stud quantity: 4 for proper wheel attachment
• Hub pilot diameter: 2.362 inches (60.00 mm)
• Flange offset: 3.085 inches (78.35 mm)
• Flange diameter: 5.512 inches (140.00 mm)
• Bolt circle diameter: 3.937 inches (100.00 mm)
• Drive type: Non-driven hub assembly

Technical Details and Specifications

The Timken HA590066 is a wheel bearing and hub assembly designed to meet the exact specifications required for proper fitment on Chevrolet Cobalt, Pontiac G5, and Saturn Ion vehicles. The assembly features a flange with four bolt holes and a matching four-stud wheel configuration, ensuring compatibility with the factory wheel setup. The wheel pilot diameter measures 2.224 inches (56.49 mm), while the brake pilot diameter is slightly larger at 2.243 inches (56.96 mm), providing precise alignment for brake components. The hub pilot diameter of 2.362 inches (60.00 mm) supports the hub's secure seating on the axle flange. With a flange offset of 3.085 inches (78.35 mm) and a flange diameter of 5.512 inches (140.00 mm), this assembly maintains proper wheel positioning and clearance. The bolt circle diameter of 3.937 inches (100.00 mm) matches the vehicle's wheel bolt pattern, ensuring a secure fit.

Compatible Vehicles and Applications

This Timken wheel bearing and hub assembly is compatible with the following vehicles:

• Chevrolet Cobalt
• Pontiac G5
• Saturn Ion

It is designed specifically for non-driven wheel positions, making it suitable for front or rear hubs depending on the vehicle's drivetrain configuration.

Common Issues Addressed by This Hub Assembly

• Wheel bearing noise or roughness during driving
• Excessive wheel play or looseness
• Uneven or premature tire wear due to hub misalignment
• Brake rotor wobble caused by worn hub pilots
• Vibration or steering instability related to hub failure

Installation Notes and Tips

• Ensure the vehicle is securely lifted and supported before beginning installation
• Clean the hub mounting surface to remove rust and debris for proper seating
• Torque flange bolts to manufacturer specifications to avoid premature wear
• Verify wheel stud count and bolt pattern compatibility before installation
• Inspect related components such as brake rotors and calipers during replacement

Quality Assurance and Warranty

Timken wheel bearing and hub assemblies are manufactured to meet strict quality standards for durability and performance. The HA590066 part number undergoes rigorous testing to ensure proper fit and function on Chevrolet Cobalt, Pontiac G5, and Saturn Ion vehicles. This product is backed by Timken's limited warranty against defects in materials and workmanship, providing confidence in its reliability for driveline and axle applications.