TOYOTA 90159-40258 Window Moulding Screw with Washer

The Toyota 90159-40258 genuine (OEM) screw with washer is a premium-quality fastener specifically designed for the precise and durable mounting of window mouldings, exterior trims, and other body components. The integrated washer design ensures optimal load distribution across the mounting points, protecting delicate plastic or metal trim elements from cracking and deformation.

Technical Characteristics and Specifications

• Type: Retaining screw with washer
• Manufacturer: Toyota (Genuine OEM part)
• Material: High-strength steel with a specialized anti-corrosion coating against environmental factors
• Design: Integrated wide washer head that prevents loosening and protects the mounting surface
• Application Area: Securing window frame mouldings, body panels, and interior trim components

Function and Importance

The window moulding retaining screw plays a crucial role in preserving the vehicle's exterior aesthetics and structural integrity. It provides the proper clamping force to prevent wind-induced vibration and rattling of the mouldings, while minimizing the ingress of moisture and dirt into body gaps. The integrated washer is essential for safeguarding the mounting surface during the tightening process.

Signs of Wear and Failure

• Corrosion and Rust: In locations exposed to moisture and road salt, the screw may oxidize over time, weakening its retention.
• Thread Damage: Over-tightening or using improper tools can strip the threads, causing the screw to lose its fastening capability.
• Loose Mouldings: If the screw loosens or shears off, trims can shift, rattle, or potentially detach during driving.
• Damaged Screw Head: A stripped or worn screw head resulting from improper past servicing complicates future maintenance or replacement.