TOYOTA 91619-61250 Bolt with Washer

The Toyota 91619-61250 is a genuine (OEM) bolt with integrated washer, engineered for precision fastening applications in Toyota and Lexus vehicles. This fastener ensures a stable, vibration-resistant, and durable connection between critical components.

Technical Features and Construction

Bolts with an integrated washer (often captive washer bolts or flanged bolts) offer numerous advantages over traditional bolt-and-washer combinations:

• Integrated Design: The washer is held captively beneath the bolt head so it cannot fall off during installation, facilitating work in hard-to-reach areas.
• Even Pressure Distribution: Due to the broader bearing surface, the washer distributes tightening torque evenly, preventing surface damage or deformation of the fastened component.
• Superior Corrosion Protection: Genuine Toyota fasteners feature specialized surface treatments (such as zinc plating or phosphating) that resist moisture, grime, and road salt.
• High Tensile Strength: Manufactured from alloy steel that meets strict OEM specifications, ensuring the bolt withstands the prescribed tightening torque without stretching or shearing.

Function and Importance

In automotive engineering, fasteners must endure continuous vibration, temperature fluctuations, and mechanical stress. The integrated washer helps maintain preload force, minimizing the risk of the bolt backing out or loosening. This design is widely used across the engine compartment, secondary chassis components, body attachments, and for mounting various brackets and protective shields.

Signs of Wear and Failure

Although fasteners are durable components, replacement is strongly advised in the following conditions:

• Corrosion and Rusting: Surface oxidation degrades material integrity and makes removal difficult.
• Thread Damage: Overtightening or cross-threading can strip the threads, leading to a complete loss of clamping load.
• Deformation or Elongation: Stretched bolts can no longer maintain their specified torque.
• Damaged Bolt Head: Rounded or stripped heads prevent proper tool engagement.

To maintain safe and reliable operation, it is recommended to replace loosened or removed fastening bolts—especially in critical assemblies—with new genuine Toyota parts.