S-90495A131 0.348" ID x 1" OD Oversized Washers

Key Features & Benefits at a Glance

• Exceptional durability with Grade 8 classification and Rockwell C38 hardness for reliable performance under high-stress conditions
• Superior corrosion resistance through zinc yellow-chromate plating that protects against rust in demanding industrial environments
• Precise dimensional fit with 0.348" ID and 1" OD ensuring proper alignment and load distribution for 5/16" fasteners
• Optimal load distribution with thickness range of 0.047-0.080" to prevent surface damage and maintain joint integrity
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe use across global industrial applications
• Heavy-duty construction using plated steel material that withstands vibration and maintains clamping force in critical assemblies
• Inch system compatibility designed for seamless integration with standard imperial fastener systems and equipment

Professional Applications & Engineering Value

This Grade 8 flat washer delivers critical engineering solutions for industrial applications where corrosion resistance and structural integrity are paramount. The zinc yellow-chromate plated steel construction provides exceptional protection against environmental degradation, making it ideal for outdoor equipment, machinery assemblies, and structural fastening systems exposed to moisture and chemicals. With its Rockwell C38 hardness and precise dimensional specifications, this washer effectively distributes clamping loads, prevents fastener embedding, and maintains joint stability in high-vibration environments. The optimized 5/16" screw size compatibility ensures proper fitment while the flat washer design addresses common challenges of surface damage and load concentration in heavy-duty industrial applications.

Specification Summary & Compliance

This flat washer features precise inch system dimensions with 0.348" inner diameter and 1" outer diameter, manufactured to standard flat washer specifications for 5/16" screw applications. The product maintains Grade 8 classification with Rockwell C38 hardness rating, ensuring consistent performance in demanding fastening scenarios. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental safety and restricted substance adherence, making it suitable for global industrial markets and regulated applications requiring certified components.