S-98970A319 2.625" ID x 5" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with hot-dipped galvanized steel construction, ensuring long-term durability in harsh industrial environments
• Heavy-duty load distribution thanks to the 5" outer diameter, preventing surface damage and fastener loosening under high stress
• Precise fit for 2 1/2" screws with a 2.625" inner diameter, reducing installation errors and improving assembly efficiency
• Consistent thickness control between 0.210" and 0.280", providing reliable performance and uniform clamping force
• Compliance with ASME B18.21.1 standards, guaranteeing dimensional accuracy and interchangeability in USS flat washer applications
• RoHS 3 environmental compliance, making it safe for use in regulated industries and sustainable procurement programs
• Robust inch system design for seamless integration with existing imperial fastener systems and tooling

Professional Applications & Engineering Value

This hot-dipped galvanized steel USS flat washer delivers exceptional engineering value by addressing common industrial challenges like corrosion-induced failure and uneven load distribution. The heavy-duty 5" OD design effectively spreads clamping force over wider surfaces, preventing material deformation in structural steel connections, machinery bases, and heavy equipment assemblies. Its galvanized surface treatment provides a sacrificial zinc layer that withstands moisture, chemicals, and outdoor exposure, significantly extending service life in construction, marine, and infrastructure projects. Engineered for 2 1/2" screw applications with precise 2.625" ID dimensions, this washer ensures proper alignment and reduces stress concentration points in critical bolted joints, making it ideal for bridge construction, industrial platforms, and utility installations where reliability is paramount.

Specification Summary & Compliance

This USS flat washer features dimensional specifications including 5" outer diameter, 2.625" inner diameter, and thickness ranging from 0.210" to 0.280" for compatibility with 2 1/2" screw sizes. Manufactured to ASME B18.21.1 standards for dimensional accuracy and performance requirements in inch system applications. The product maintains RoHS 3 (2015/863/EU) compliance for environmental safety and meets industry expectations for heavy-duty flat washers in corrosion-resistant applications.