S-90495A133 0.348" ID x 1.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Exceptional Load Distribution with a large 1.5" outer diameter, minimizing surface pressure and preventing damage to assembled materials.
• Superior Corrosion Resistance from the zinc yellow-chromate plating, ensuring long-term reliability in harsh or outdoor industrial environments.
• High-Strength Performance backed by a Grade 8 classification and Rockwell C38 hardness, providing dependable performance under high-stress applications.
• Precise Fit and Vibration Resistance with a 0.348" inner diameter designed for 5/16" fasteners, maintaining secure connections and reducing loosening.
• Durable and Consistent Thickness ranging from 0.047" to 0.080", offering reliable performance and uniform load-bearing capacity.
• Compliance with Environmental and Safety Standards, being RoHS 3 and REACH compliant, making them suitable for regulated industries and global supply chains.
• Heavy-Duty Construction from plated steel, engineered for demanding applications where fastener failure is not an option.

Professional Applications & Engineering Value

This Grade 8 flat washer is engineered to solve critical challenges in heavy-duty industrial applications, such as construction machinery, automotive assemblies, and structural frameworks. The zinc yellow-chromate plated steel construction provides a robust barrier against corrosion and oxidation, significantly extending the service life of the fastener assembly in environments exposed to moisture, chemicals, or varying temperatures. Its large outer diameter (1.5" OD) and high-strength material work in tandem to distribute clamping force over a wider area, preventing joint failure, surface indentation, and bolt loosening due to vibration—a common pain point in dynamic load scenarios. By specifying these 5/16" washers, engineers and procurement managers ensure a reliable, long-lasting connection that meets the rigorous demands of industrial washers applications while adhering to strict quality and material standards.

Specification Summary & Compliance

This washer conforms to the inch system of measurement with an Inner Diameter (ID) of 0.348" and Outer Diameter (OD) of 1.5", designed for use with 5/16" screw sizes. The material is zinc yellow-chromate plated steel with a hardness of Rockwell C38 and meets the Fastener Strength Grade 8 requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of restricted hazardous substances and safe for use in environmentally conscious industrial markets.