S-90108A043 1.75" ID x 3.75" 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 3.75" OD and 1.75" ID dimensions to prevent surface damage and joint loosening
• Precision-engineered thickness (0.153-0.213") ensures consistent performance and reliable spacing in heavy-duty assemblies
• Guaranteed dimensional accuracy through compliance with ASME B18.21.1 standards for reliable interchangeability
• Environmental regulation compliance with RoHS 3 and REACH certifications for safe global industrial use
• Perfect compatibility with 1 5/8" screws for secure fastening in structural and mechanical applications
• Heavy-duty construction designed to withstand high-pressure industrial environments without deformation

Professional Applications & Engineering Value

This USS flat washer delivers exceptional engineering value through its zinc-plated steel construction, providing critical corrosion resistance that extends equipment lifespan in humid or chemically aggressive environments. The substantial 3.75" outer diameter creates an optimal bearing surface that distributes clamping forces evenly, preventing surface indentation and maintaining joint integrity under heavy loads. Engineered specifically for 1 5/8" screw applications, this industrial-grade washer addresses common failure points in structural steel connections, machinery assembly, and heavy equipment manufacturing. The precise dimensional control ensures consistent performance across multiple installations, reducing maintenance frequency and improving overall assembly reliability in demanding mechanical applications where vibration and dynamic loads are common challenges.

Specification Summary & Compliance

This USS flat washer features inch system dimensions with 3.75" OD, 1.75" ID, and thickness ranging 0.153-0.213". Manufactured to ASME B18.21.1 specifications for dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage across global industrial markets without hazardous substance restrictions.