TOYOTA 90179-12115 Engine Mount Nut with Washer

The Toyota 90179-12115 is a genuine OEM nut with an integrated washer, specifically engineered for the secure fastening of critical structural vehicle components, primarily engine mounts. This high-strength fastener ensures that the engine and transmission remain stably secured to the body or subframe, minimizing vibration and unwanted movement.

Technical Features and Specifications

• Manufacturer: Toyota (Genuine OEM part)
• Part Number: 90179-12115
• Type: Nut with integrated washer (flange nut)
• Material: High-tensile hardened steel for maximum torque resistance
• Surface Treatment: Corrosion-resistant galvanized or phosphated coating for protection against environmental influences
• Application Area: Engine mounts, suspension components, and other heavy-duty fastening points

Function and Importance

Fastener nuts used for engine mounts must endure extreme dynamic loads, continuous vibrations, and substantial temperature fluctuations. The integrated washer (flange) plays a crucial role: it distributes clamping force evenly across the contact surface, prevents damage to the mating component material, and reduces the risk of vibration-induced loosening. Genuine Toyota fasteners guarantee precise thread pitch and accurate adherence to factory torque specifications.

Signs of Wear or Damage

Although fasteners are durable components, replacing the nuts is strongly recommended whenever replacing or servicing engine mounts. The most common issues include:

• Thread Damage: Over-torquing or improper installation (cross-threading) can ruin the thread profile.
• Corrosion: Rusting caused by moisture and road salts weakens the material structure, making removal difficult or leading to breakage.
• Deformation: Metal fatigue or over-tightening can cause the nut to lose its original shape and clamping force.