TOYOTA 91551-80825 Flange Bolt

The genuine TOYOTA 91551-80825 flange bolt is a premium-quality, high-tensile fastener engineered specifically to meet rigorous automotive standards. The flanged design (integrated washer) plays a crucial role in evenly distributing clamping force, preventing surface damage to fastened components and guarding against loosening caused by vibration.

Technical Features and Benefits:

• Integrated Flange (Washer): Provides an increased bearing surface area, eliminating the need for a separate washer, which reduces assembly time and assembly errors.
• High Tensile Strength: Manufactured from a high-grade steel alloy that withstands severe mechanical stress and shearing forces.
• Corrosion Protection: Features a specialized surface treatment providing protection against rust and corrosion caused by moisture, salt spray, and road de-icing agents.
• Precision Thread Design: Ensures accurate, smooth engagement, minimizing the risk of cross-threading or thread damage during installation.

Role and Importance in the Vehicle:

Flange bolts are used across numerous critical vehicle assemblies, such as the suspension, engine block, transmission, as well as various auxiliary equipment and mounting brackets. Their purpose is to maintain structural integrity even under extreme vibration and temperature fluctuations.

Signs of Wear or Failure:

• Thread Stretching or Deformation: Over-torquing can stretch the bolt, resulting in a loss of clamping force.
• Corrosion and Rust: If the protective surface coating is compromised, rust can weaken the fastener's structural integrity, potentially leading to breakage.
• Loosening: Severe vibration or incorrect tightening torque can cause the joint to back out, leading to rattling noises or component displacement.

To ensure safe and reliable operation, damaged, corroded, or stretched bolts should always be replaced with genuine new TOYOTA parts, strictly adhering to the manufacturer-specified tightening torque specifications.