S-90495A132 0.348" ID x 1.25" OD Oversized Washers

Key Features & Benefits at a Glance

• Exceptional Load Distribution – The 1.25" outer diameter provides a wide bearing surface, effectively distributing clamp load and preventing surface damage to assembled materials.
• Superior Corrosion Resistance – The zinc yellow-chromate plating offers a robust protective barrier, significantly extending service life in demanding or humid environments.
• High-Strength Reliability – Manufactured to Grade 8 standards, this washer is built for high-stress applications, ensuring integrity under heavy loads and vibration.
• Precision Fit for 5/16" Fasteners – The 0.348" inner diameter ensures a snug and secure fit on 5/16" screws and bolts, minimizing play and improving joint stability.
• Enhanced Durability – With a Rockwell C38 hardness, the washer resists deformation and maintains its shape under extreme pressure, offering long-term performance.
• Regulatory Compliance Assurance – Compliant with RoHS 3 and REACH regulations, making it suitable for global supply chains and environmentally conscious industrial projects.
• Versatile Thickness Range – A thickness of 0.047-0.080" provides flexibility for various gasketing and spacing needs without compromising strength.

Professional Applications & Engineering Value

This Grade 8 flat washer is engineered to solve critical challenges in heavy machinery, construction, and automotive assemblies where joint failure is not an option. The zinc yellow-chromate plated steel construction directly combats corrosion, a common cause of fastener degradation in harsh industrial environments. Its high Rockwell C38 hardness ensures it does not compress or fracture under the immense clamp loads typical of Grade 8 fastener systems, maintaining bolt preload and preventing loosening due to vibration. By providing a reliable, corrosion-resistant interface, this washer extends the lifespan of the entire bolted connection, reducing maintenance downtime and replacement costs in critical industrial applications.

Specification Summary & Compliance

This flat washer conforms to inch system measurements with an Inner Diameter (ID) of 0.348", Outer Diameter (OD) of 1.25", and a Thickness range of 0.047-0.080", designed for a 5/16" screw size. It is manufactured from plated steel to Grade 8 strength classification and a hardness of Rockwell C38. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated markets.