TOYOTA 91551-80820 Flange Bolt

The Toyota 91551-80820 is a genuine OEM flange bolt, engineered and manufactured to meet Toyota's stringent quality and durability standards. This fastener plays a critical role in providing secure, vibration-resistant fastening for various structural, engine, or suspension components of the vehicle.

Technical Features and Design

The specialized design of flange bolts combines the benefits of a standard hex head bolt and a washer. The integrated flange provides a larger bearing surface that distributes clamping force evenly, prevents material deformation, and reduces the risk of loosening caused by vibration.

• Manufacturer: Toyota (Genuine OEM part)
• Part Number: 91551-80820
• Type: Flange bolt
• Material: High-strength, hardened steel alloy for maximum tensile strength
• Surface Treatment: Corrosion-resistant coating that withstands moisture and environmental exposure
• Design: Integrated washer flange head for optimal load distribution

Function and Importance

In the automotive industry, flange bolts are utilized in locations where vibration and dynamic loads present a risk of conventional bolted joints loosening. Genuine Toyota bolts ensure accurate thread pitch and the correct tensile strength rating, preventing thread stripping or bolt head shearing during installation.

Signs of Wear, Degradation, and Replacement

Although fasteners are not traditional wear items, replacement is critical in the following situations:

• Corrosion and Rust: Surface rust compromises the integrity of the material, which can lead to failure or breakage.
• Thread Damage: Stretched or cross-threaded threads will not maintain the required clamping force.
• Deformation: Overtorquing can stretch the bolt shank.
• Single-Use Specifications: In certain critical assemblies (e.g., cylinder head, suspension components), bolts are specified for one-time use and must be replaced with new genuine units whenever removed.