S-90770A029 0.26" ID x 0.625" OD General Purpose Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from Alloy 20 Stainless Steel, ideal for harsh chemical and acidic environments.
• Precise fit for 1/4" screws with a 0.26" inner diameter, ensuring secure fastening and load distribution.
• Optimized surface coverage with a 0.625" outer diameter, providing excellent bearing surface and preventing embedment.
• Consistent performance due to a controlled thickness range of 0.050-0.070", maintaining uniform pressure distribution.
• Built for demanding industrial applications with robust construction that enhances joint integrity and longevity.
• Full regulatory compliance with RoHS 3 and REACH, ensuring safety and environmental standards are met for global supply chains.
• Seamless integration into inch-system assemblies, simplifying procurement and installation for North American and international projects.

Professional Applications & Engineering Value

Engineered for severe service conditions, these Alloy 20 Stainless Steel flat washers deliver superior performance in industries like chemical processing, pharmaceuticals, and food manufacturing where corrosion from aggressive media is a critical concern. The high nickel and chromium content in the alloy provides outstanding resistance to sulfuric acid, phosphoric acid, and other corrosive agents, significantly reducing maintenance downtime and replacement costs. The precise 1/4" screw size compatibility and inch-system dimensions ensure easy integration into existing assemblies, while the flat washer design effectively distributes clamp load, prevents surface damage, and maintains bolt tension under vibration. This combination of material excellence and dimensional accuracy makes them an essential component for engineers specifying reliable, long-lasting fastening solutions in corrosive environments.

Specification Summary & Compliance

This flat washer conforms to standard inch-system dimensions with an inner diameter of 0.26", outer diameter of 0.625", and thickness ranging from 0.050" to 0.070", designed specifically for use with 1/4" screws. It is manufactured from Alloy 20 Stainless Steel, offering excellent mechanical properties for industrial use. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from restricted hazardous substances and meets the latest environmental and safety standards for industrial components.