S-90108A044 1.875" ID x 4" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• Optimal load distribution through a large 4" outer diameter, minimizing surface pressure and preventing material damage
• Precise compatibility with 1 3/4" screw sizes via 1.875" inner diameter, ensuring secure fastening in industrial assemblies
• Reliable mechanical performance backed by ASME B18.21.1 specifications, guaranteeing dimensional accuracy and functional consistency
• Environmental compliance assurance with RoHS 3 and REACH adherence, supporting sustainable and safe industrial operations
• Robust durability from steel material, providing long-term stability under heavy loads and vibration
• Versatile inch-system sizing for seamless integration into standard USS-designated equipment and machinery

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these USS flat washers address critical challenges in machinery assembly, structural framing, and equipment maintenance. The zinc-plated steel material combats rust and corrosion in humid or outdoor settings, while the substantial 4" OD and 1.875" ID optimize load dispersion to prevent bolt loosening and surface indentation. By conforming to ASME B18.21.1 standards, these washers deliver precise Class 2A thread fit and consistent thickness (0.153–0.213"), reducing installation errors and enhancing joint integrity in 1 3/4" screw size systems. Ideal for construction, automotive, and manufacturing sectors, they provide a cost-effective solution to prolong assembly lifespan and minimize maintenance downtime.

Specification Summary & Compliance

This USS flat washer features an inner diameter of 1.875", outer diameter of 4", and thickness range of 0.153–0.213" with standard inch-system measurements. Manufactured in accordance with ASME B18.21.1 for dimensional tolerances and performance, it ensures reliable compatibility with 1 3/4" screw sizes. The product fully complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its adherence to environmental safety and restricted substance guidelines.