S-90476A101 2.125" ID x 4.5" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with zinc yellow-chromate plating for long-lasting performance in harsh industrial environments
• Superior load distribution thanks to the 4.5" outer diameter, preventing surface damage and joint loosening
• High-strength construction with Grade 8 classification and Rockwell C38 hardness for demanding heavy-duty applications
• Precise compatibility with 2" screw sizes and 2.125" inner diameter ensuring secure, vibration-resistant fastening
• Consistent dimensional accuracy with thickness ranging 0.153-0.213" for reliable performance across multiple installations
• Regulatory compliance assurance meeting ASME B18.21.1 standards and environmental regulations including RoHS 3 and REACH
• Enhanced durability through hardened steel construction that withstands extreme pressure and repetitive stress

Professional Applications & Engineering Value

These Grade 8 USS flat washers provide critical engineering solutions for heavy-duty industrial applications where fastener failure is not an option. The zinc yellow-chromate plated steel construction delivers superior corrosion protection in challenging environments including outdoor construction, marine equipment, and manufacturing facilities. With Rockwell C38 hardness and Grade 8 strength classification, these washers maintain integrity under extreme vibration and load conditions, preventing joint loosening and surface damage. The optimized 2.125" ID and 4.5" OD dimensions ensure proper load distribution for 2" screw size applications, making them ideal for structural steel connections, heavy machinery assembly, and infrastructure projects requiring reliable, long-lasting fastening solutions.

Specification Summary & Compliance

Manufactured to exacting ASME B18.21.1 standards with precise dimensional tolerances including 2.125" inner diameter, 4.5" outer diameter, and thickness range of 0.153-0.213". These USS flat washers feature Grade 8 strength classification and Rockwell C38 hardness for maximum performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets while meeting the highest quality and safety standards for heavy-duty fastening applications.