S-90474A117 0.531" ID x 1.25" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc yellow-chromate plating, extending service life in harsh industrial environments.
• Exceptional load distribution from the 1.25" OD, preventing surface damage and fastener loosening under high stress.
• High-strength performance with Grade 8 classification and Rockwell C38 hardness, ensuring reliability in heavy-duty applications.
• Precise fit and alignment with a 0.531" ID designed for 1/2" screws, reducing installation errors and improving assembly efficiency.
• Compliance with industry standards per ASME B18.21.1, guaranteeing consistent quality and dimensional accuracy.
• Environmental and safety adherence through RoHS 3 and REACH compliance, supporting sustainable and safe industrial operations.
• Durable material construction using plated steel, offering long-term durability and resistance to wear and deformation.

Professional Applications & Engineering Value

These Grade 8 flat washers are engineered to address common industrial challenges such as joint failure, corrosion-induced degradation, and inconsistent load distribution. Made from zinc yellow-chromate plated steel, they provide a robust barrier against moisture and chemicals, significantly reducing maintenance needs in demanding environments like construction, machinery assembly, and automotive systems. The precise 1/2" ID and 1.25" OD ensure optimal surface contact, minimizing stress concentrations and enhancing the longevity of fastened connections. By adhering to ASME B18.21.1 standards, these washers deliver reliable performance in heavy-duty applications, making them ideal for engineers and procurement specialists seeking components that combine strength, corrosion resistance, and regulatory compliance for seamless integration into critical assemblies.

Specification Summary & Compliance

This flat washer features an inner diameter of 0.531", outer diameter of 1.25", and thickness range of 0.090-0.112", designed for use with 1/2" screw sizes in the inch measurement system. It meets ASME B18.21.1 specifications for dimensional accuracy and performance, with a material hardness of Rockwell C38 and Grade 8 strength classification. 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 global industrial supply chains.