S-90108A050 3.125" ID x 5.5" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance from zinc-plated steel construction, extending service life in demanding industrial environments
• Optimal load distribution with 5.5" outer diameter, preventing surface damage and maintaining joint integrity
• Precise compatibility with 3" screws through 3.125" inner diameter, ensuring secure fastening applications
• Enhanced durability with thickness ranging 0.249-0.327", providing reliable performance under heavy loads
• Industry-standard compliance with ASME B18.21.1 specifications, guaranteeing consistent quality and performance
• Environmental responsibility through RoHS 3 and REACH compliance, meeting strict regulatory requirements
• Versatile inch system compatibility for seamless integration with existing industrial equipment and fastening systems

Professional Applications & Engineering Value

This USS flat washer delivers exceptional engineering value through its zinc-plated steel construction and substantial dimensions. The 3.125" ID x 5.5" OD configuration provides maximum surface coverage, effectively distributing loads and preventing embedment in softer materials. The zinc plating offers critical corrosion resistance in industrial settings where moisture, chemicals, and environmental factors threaten fastener integrity. Engineered to ASME B18.21.1 standards, this heavy-duty flat washer solves common engineering challenges including joint relaxation, surface damage, and premature failure in 3" screw applications. Its robust construction makes it ideal for structural steel connections, heavy machinery assembly, and infrastructure projects requiring reliable, long-lasting fastening solutions.

Specification Summary & Compliance

This USS flat washer features inch system dimensions with 3.125" inner diameter, 5.5" outer diameter, and thickness ranging 0.249-0.327". Manufactured to ASME B18.21.1 specifications for dimensional accuracy and performance consistency. The product maintains full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety. Designed specifically for use with 3" screws in industrial and construction applications requiring reliable load distribution and corrosion protection.