S-90108A039 1.25" ID x 2.75" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion protection with zinc-plated steel construction for extended service life in demanding environments
• Optimal load distribution with 2.75" outer diameter preventing surface damage and material embedment
• Precise fit for 1 1/8" fasteners with 1.25" inner diameter ensuring secure installation and vibration resistance
• Consistent performance through ASME B18.21.1 compliance guaranteeing dimensional accuracy and interchangeability
• Enhanced durability with thickness range of 0.136-0.192" providing reliable compression and joint integrity
• Environmental compliance meeting RoHS 3 and REACH regulations for safe use across global markets
• Universal compatibility with inch measurement system facilitating integration into existing industrial assemblies

Professional Applications & Engineering Value

These USS flat washers deliver critical engineering solutions where load distribution and corrosion resistance are paramount. The zinc-plated steel construction creates a protective barrier against moisture and chemical exposure, significantly extending component life in outdoor, marine, and industrial settings. With their generous 2.75" OD surface area, these washers effectively prevent bolt heads and nuts from embedding into soft materials while reducing point loading on connected surfaces. The precise 1.25" ID ensures perfect alignment with 1 1/8" screws, maintaining joint integrity under vibration and dynamic loads. Manufactured to ASME B18.21.1 standards, these washers provide reliable performance in structural connections, heavy machinery, and construction applications where failure is not an option.

Specification Summary & Compliance

This USS flat washer features dimensional specifications of 1.25" inner diameter, 2.75" outer diameter, and thickness ranging 0.136-0.192" for use with 1 1/8" fasteners. The product strictly conforms to ASME B18.21.1 dimensional standards and manufacturing requirements. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and unrestricted use in industrial applications across regulated markets.