TOYOTA 90119-18006 Control Arm Bolt with Washer

The genuine TOYOTA (SKU: 90119-18006) bolt with washer (control arm mounting bolt) is a critical, high-strength fastener engineered specifically to provide secure and stable mounting for suspension system components, primarily control arms. This premium OEM part ensures the structural integrity of the suspension, essential for maintaining proper wheel alignment and safe road handling.

Technical Features and Construction

Control arm mounting bolts are subjected to extreme mechanical stresses, vibrations, and environmental elements. Consequently, they are manufactured to TOYOTA's rigorous factory standards:

• High-tensile steel alloy: Resists dynamic loads, shear stress, and tensile stress.
• Integrated washer (W/WASHER): Ensures even clamping force distribution across the mounting surface, prevents thread loosening despite continuous vibration, and protects the control arm bushing or subframe from damage.
• Corrosion-resistant coating: Features a specialized surface treatment (such as zinc plating or phosphating) that shields the bolt from moisture, road salt, and rust, preventing structural weakening or seizing.

Role and Importance of the Control Arm Bolt

The control arm connects the wheel hub to the vehicle chassis or subframe. The function of the mounting bolt is to maintain this connection firmly and without play. A loose or stretched bolt directly affects vehicle handling, tire wear, and driving safety.

Signs of Wear or Failure

Suspension fasteners should be inspected regularly, especially during wheel alignments or control arm replacements. Replacing the bolt is recommended in the following cases:

• Visible corrosion or rust: Weakens the bolt's material, which can lead to breakage.
• Thread damage or stretching: Overstretched bolts lose their elastic clamping tension, failing to maintain proper clamping torque.
• Deformation: The bolt may bend following a severe impact (e.g., hitting a pothole or after a collision).
• Knocking noises from the suspension: If the bolt loosens or stretches, the control arm may shift, causing metallic knocking sounds during braking, acceleration, or cornering.

Note: When installing suspension safety components, always observe the manufacturer's specified tightening torques, and it is recommended to replace fasteners with new genuine parts whenever replacing control arms.