S-90474A129 0.344" ID x 1.125" OD ASME B18.21.1 ASME Washers

Key Features & Benefits at a Glance

• Exceptional load distribution with a 1.125" OD and 0.344" ID, reducing surface pressure and preventing damage to assembled materials.
• Superior corrosion resistance from the zinc yellow-chromate plating, extending service life in harsh or outdoor industrial environments.
• High-strength performance with a Rockwell C38 hardness and Grade 8 classification, ensuring reliability under heavy loads and high-stress conditions.
• Precise dimensional fit for 5/16" screws, providing secure fastening and reducing the risk of loosening in vibrating machinery.
• Regulatory compliance assurance with ASME B18.21.1 standards, ensuring consistent quality and interchangeability in professional applications.
• Environmental and safety adherence through RoHS 3 and REACH compliance, making them suitable for regulated industries and global supply chains.
• Durable material construction using plated steel, offering an optimal balance of strength, wear resistance, and long-term cost efficiency.

Professional Applications & Engineering Value

These Grade 8 flat washers are engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where vibration, high tensile loads, and exposure to corrosive elements are common. The zinc yellow-chromate plated steel construction provides a robust barrier against rust and chemical degradation, significantly reducing maintenance frequency and failure risks. With a Rockwell C38 hardness and compliance to ASME B18.21.1, they ensure precise load distribution and fastener stability, preventing joint fatigue and material deformation. Ideal for use in structural bolting, engine components, and industrial equipment, these washers deliver consistent performance, enhance safety, and lower total cost of ownership by minimizing replacements and downtime.

Specification Summary & Compliance

This flat washer meets dimensional specifications with an Inside Diameter of 0.344", Outside Diameter of 1.125", and Thickness ranging from 0.056" to 0.071", designed for 5/16" screw sizes in the inch system. It conforms to the ASME B18.21.1 standard for flat washers, ensuring precise manufacturing tolerances and performance reliability. 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 adherence to environmental health standards for industrial use.