Timken HA590580 Wheel Bearing and Hub Assembly - Front

Timken HA590580 Wheel Bearing and Hub Assembly Overview

The Timken HA590580 wheel bearing and hub assembly is engineered for reliable performance in Subaru vehicles, including Forester, Impreza, WRX, and WRX STI models. Designed to meet precise specifications, this assembly ensures proper fitment and durability for driven axles.

• 27 spline quantity for secure axle engagement
• 4 flange bolt holes with a 114.30 mm (4.500 inch) bolt circle diameter
• 5 wheel studs for stable wheel mounting
• Wheel pilot diameter of 55.96 mm (2.203 inches) for accurate wheel centering
• Brake pilot diameter of 57.94 mm (2.281 inches) to support brake component alignment
• Hub pilot diameter of 83.95 mm (3.305 inches) for precise hub positioning
• Flange diameter of 137.72 mm (5.422 inches) with a flange offset of 46.38 mm (1.826 inches)
• Designed for driven axle applications

Detailed Product Description

The Timken HA590580 wheel bearing and hub assembly is a critical driveline component designed specifically for Subaru Forester, Impreza, WRX, and WRX STI models. This assembly features a 27-spline driven axle interface, ensuring a secure connection between the axle shaft and hub. The 4-bolt flange with a 114.30 mm bolt circle diameter provides a robust mounting surface, while the 5 wheel studs accommodate standard wheel configurations. The wheel pilot diameter of 55.96 mm and brake pilot diameter of 57.94 mm ensure proper centering of wheels and brake rotors, reducing vibration and improving braking performance. Additionally, the hub pilot diameter of 83.95 mm supports accurate hub alignment within the vehicle’s suspension system. The flange offset of 46.38 mm is designed to maintain correct wheel positioning relative to the vehicle’s suspension geometry.

Common Applications and Problem Resolution

• Replacement for worn or damaged wheel bearing and hub assemblies on Subaru Forester, Impreza, WRX, and WRX STI
• Eliminates wheel vibration caused by bearing wear or hub misalignment
• Resolves noise issues such as humming or grinding from the wheel area
• Restores proper wheel and brake rotor centering to improve braking performance
• Addresses axle spline wear affecting drivetrain engagement

Installation Notes and Tips

Ensure the vehicle is securely lifted and supported before beginning installation. Verify that the spline count (27 splines) matches the axle shaft. Clean the mounting surfaces thoroughly to prevent contamination and ensure proper fitment. Torque flange bolts to manufacturer specifications to maintain assembly integrity. Check wheel stud condition and replace if necessary to ensure safe wheel mounting.

Quality Assurance and Warranty

Timken wheel bearing and hub assemblies are manufactured to meet or exceed OEM standards for fit, form, and function. The HA590580 part number undergoes rigorous quality control to ensure durability and performance in demanding driving conditions. Warranty coverage details should be confirmed with the point of purchase or Timken directly.