S-91117A228 0.531" ID x 2" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance through zinc plating, extending service life in demanding industrial environments
• Optimal load distribution with precise 2" outer diameter, preventing surface damage and joint loosening
• Perfect fit for 1/2" fasteners with 0.531" inner diameter, ensuring secure installation and vibration resistance
• Enhanced durability from Rockwell B40 hardness, maintaining structural integrity under heavy loads
• Consistent performance with controlled thickness (0.235-0.265"), providing reliable sealing and spacing functions
• Environmental compliance meeting RoHS 3 and REACH standards, suitable for regulated industries
• Heavy-duty construction using steel material, capable of withstanding high-stress applications

Professional Applications & Engineering Value

This zinc-plated steel flat washer delivers exceptional engineering value in industrial fastening systems where corrosion resistance and load distribution are critical. The inch system measurements (0.531" ID x 2" OD) ensure perfect compatibility with 1/2" screw size applications, preventing bolt loosening from vibration and thermal cycling. The zinc plating creates a protective barrier against moisture and chemicals, significantly extending the service life in outdoor, marine, and chemical processing environments. With Rockwell B40 hardness, these flat washers maintain dimensional stability under substantial clamping forces, making them ideal for heavy machinery, structural steel connections, and automotive assemblies where consistent performance and regulatory compliance are mandatory.

Specification Summary & Compliance

Manufactured to precise dimensional tolerances with inner diameter of 0.531", outer diameter of 2", and thickness range of 0.235-0.265". The washer features standard inch system measurements compatible with 1/2" screw sizes and achieves Rockwell B40 hardness for mechanical durability. Full compliance with RoHS 3 (2015/863/EU) under exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) standards as of 01/17/2023, ensuring environmental regulatory adherence for industrial applications.