S-90313A351 0.531" ID x 3" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional load distribution with 3" outer diameter, preventing surface damage and fastener loosening
• Precise fit for 1/2" screws with 0.531" inner diameter, ensuring secure fastening alignment
• Durable mechanical performance with thickness range of 0.051-0.080" for consistent spacing and pressure distribution
• Environmental compliance assurance with RoHS 3 and REACH compliance for global industrial applications
• Reliable inch-system compatibility for seamless integration with standard industrial equipment
• Long-term cost efficiency through stainless steel's resistance to rust and degradation

Professional Applications & Engineering Value

This heavy-duty flat washer addresses critical engineering challenges in industrial fastening systems where corrosion resistance and load distribution are paramount. The 18-8 stainless steel composition provides excellent protection against chemical exposure and atmospheric corrosion, making it ideal for outdoor installations, marine environments, and chemical processing facilities. The substantial 3" outer diameter creates an optimal bearing surface that prevents embedment in soft materials and distributes clamping force evenly, reducing stress concentrations that can lead to joint failure. When paired with 1/2" screws, the precisely engineered 0.531" inner diameter ensures proper alignment and prevents misinstallation in high-vibration applications. These industrial washers deliver reliable performance in structural connections, machinery assembly, and heavy equipment maintenance where consistent spacing and long-term reliability are essential.

Specification Summary & Compliance

This flat washer features inch-system dimensions with outer diameter of 3", inner diameter of 0.531", and thickness ranging from 0.051" to 0.080". Manufactured from 18-8 stainless steel for consistent mechanical properties, it is engineered for use with 1/2" screw size applications. The product fully complies with RoHS 3 (2015/863/EU) regulations and REACH (EC 1907/2006) standards, including the latest SVHC requirements as of June 14, 2023, ensuring environmental safety and regulatory compliance for industrial users worldwide.