S-91090A121 0.406" ID x 1.25" OD Oversized Washers

Key Features & Benefits at a Glance

• Enhanced Load Distribution: The 1.25" outer diameter provides a wide bearing surface, effectively spreading the load to prevent surface damage and joint loosening under vibration.
• Superior Corrosion Resistance: The Zinc-Plated Steel construction offers a protective barrier, significantly extending the washer's service life in humid or demanding industrial environments.
li>Precision Fit for 3/8" Screws: The 0.406" inner diameter ensures a secure and accurate fit on standard 3/8" fasteners, simplifying assembly and improving joint integrity.
• Durable Material Strength: Made from robust steel, this washer maintains its form under pressure, providing reliable, long-term performance in high-stress applications.
• Consistent Dimensional Accuracy: A controlled thickness of 0.042-0.051" guarantees uniform performance and predictable compression in every application.
• Global Regulatory Compliance: Conforms to RoHS 3 and REACH standards, ensuring they are safe for use in regulated markets and environmentally conscious projects.
• Versatile Industrial Application: Ideal for a broad range of uses from machinery assembly to construction, offering a dependable, all-purpose sealing and spacing solution.

Professional Applications & Engineering Value

This zinc-plated steel flat washer is engineered to solve critical challenges in industrial assembly and construction. Its primary function is to distribute the load of a 3/8" screw, preventing the fastener from pulling through soft materials and protecting surfaces from galling and corrosion. The zinc plating is key, providing a sacrificial layer that combats rust, a common failure point in outdoor or high-moisture environments like construction sites or manufacturing plants. The precise 0.406" ID ensures there is no play on the screw, which is vital for maintaining the clamp load and structural integrity of the joint. By offering a reliable, compliant, and durable component, this washer reduces maintenance needs and enhances the longevity of the overall assembly, delivering significant engineering value.

Specification Summary & Compliance

This flat washer conforms to standard inch dimensions with an Inner Diameter (ID) of 0.406", Outer Diameter (OD) of 1.25", and a Thickness of 0.042-0.051", designed for use with 3/8" screws. The product is manufactured from zinc-plated steel and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and suitable for global supply chains.