S-90481A206 0.348" ID x 1.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from the black-oxide steel finish, extending service life in harsh industrial environments
• Precise dimensional fit with 0.348" inner diameter designed specifically for 5/16" screws, ensuring secure fastening and load distribution
• Optimal surface coverage with a 1.5" outer diameter, providing excellent bearing surface and preventing pull-through in soft materials
• Versatile thickness range of 0.051-0.080" accommodates various assembly requirements and compensates for minor gaps
• Environmental compliance assurance with RoHS 3 and REACH compliance, meeting strict international regulatory standards
• Durable steel construction offers reliable performance under mechanical stress and repeated use conditions
• Standard inch sizing ensures compatibility with existing industrial equipment and fastener systems

Professional Applications & Engineering Value

This black-oxide steel flat washer delivers critical engineering solutions for industrial applications where corrosion resistance and dimensional precision are paramount. The black-oxide surface treatment creates a protective barrier against moisture and chemical exposure, significantly reducing oxidation in demanding environments such as outdoor equipment, automotive assemblies, and machinery frames. With its specific 5/16" screw size compatibility and generous 1.5" outer diameter, this flat washer effectively distributes clamping force over a wider area, preventing surface damage and maintaining joint integrity. The controlled thickness variation allows for precise gap management in stacked assemblies, making these industrial washers ideal for applications requiring consistent preload and vibration resistance without compromising the protective coating.

Specification Summary & Compliance

This flat washer features inch system dimensions with 0.348" inner diameter, 1.5" outer diameter, and thickness range of 0.051-0.080" specifically designed for 5/16" screw applications. Manufactured from black-oxide steel, the product maintains dimensional accuracy suitable for standard industrial use. The washer is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for global industrial supply chains.