S-91525A337 0.531" ID x 1.5" OD Oversized Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction, ideal for marine, chemical, and outdoor applications.
• Exceptional durability and load distribution with a Rockwell B68 hardness, reducing surface damage and extending assembly life.
• Precise fit for 1/2" screws with a 0.531" inner diameter, ensuring secure fastening and minimizing loosening risks.
• Optimized bearing surface provided by the 1.5" outer diameter, effectively spreading clamp load and preventing material embedding.
• Consistent performance guaranteed by a controlled thickness range of 0.110-0.140", maintaining uniform pressure in assembled joints.
• Compliance with stringent environmental regulations, including RoHS 3 and REACH, ensuring safe use in regulated industries.
• Reliable for heavy-duty industrial use, offering long-term stability in high-stress mechanical and structural applications.

Professional Applications & Engineering Value

This 316 stainless steel flat washer is engineered to address common industrial challenges such as galvanic corrosion, vibration-induced failure, and premature wear. Its high chromium and nickel content provides excellent resistance to pitting and crevice corrosion, making it a top choice for marine equipment, chemical processing plants, and food-grade machinery. The precise 0.531" ID and 1.5" OD ensure optimal load distribution, reducing stress concentrations on connected surfaces. With a Rockwell B68 hardness, it maintains structural integrity under repeated loading, while the inch system measurements facilitate seamless integration into existing American standard assemblies. This washer is indispensable for engineers seeking a corrosion-resistant, heavy-duty flat washer that enhances the longevity and safety of critical fastening systems.

Specification Summary & Compliance

This flat washer adheres to standard inch system dimensions with an inner diameter of 0.531", outer diameter of 1.5", and thickness ranging from 0.110" to 0.140", designed specifically for use with 1/2" screws. It is manufactured from 316 stainless steel with a hardness of Rockwell B68, ensuring consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting environmentally responsible procurement.