TOYOTA 91551-80612 Flange Bolt

This genuine Toyota (OEM: 91551-80612) flange bolt is a premium-quality, high-strength fastener specifically designed for the secure fastening of various structural and mechanical vehicle components. The flanged design functions as an integrated washer, evenly distributing clamping force to prevent damage to mounting surfaces and reduce the risk of loosening.

Technical Features and Benefits:

• Material Quality: High-tensile, hardened steel alloy engineered to withstand heavy mechanical loads and vibration.
• Surface Protection: Specialized corrosion-resistant coating that protects the bolt against moisture, dirt, and road salt.
• Integrated Flange: Provides an expanded contact surface, eliminating the need for a separate washer while ensuring more uniform pressure distribution and a stable connection.
• OEM Standard: Precise dimensional tolerances and thread pitch, guaranteeing a perfect fit and compliance with factory torque specifications.

Role and Importance:

In automotive applications, flange bolts are utilized in critical areas such as chassis components, engine compartment assemblies, transmission mountings, and exhaust brackets. Because these areas are subject to continuous vibrations and dynamic loads, fasteners must be exceptionally reliable to maintain structural integrity.

Signs of Wear and Failure:

• Corrosion and Rust: Surface rust can weaken the fastener over time and complicate removal.
• Thread Damage or Bolt Stretch: Overtightening or improper torque application can cause thread deformation or shank elongation.
• Loosening: If a bolt loses its clamping force, attached components may rattle or become unstable, posing a safety hazard.

To ensure safe and lasting repairs, damaged, stretched, or heavily corroded bolts should always be replaced with new, genuine OEM fasteners.