S-90108A033 0.562" ID x 1.375" OD ASME B18.21.1 USS Washers

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding environments
• Optimal load distribution with 1.375" OD and 0.086-0.132" thickness range, preventing surface damage and fastener loosening
• Precision fit for 1/2" screws with 0.562" ID, ensuring secure fastening and reducing installation errors
• Heavy-duty performance meeting USS designation standards, suitable for high-stress industrial applications
• Regulatory compliance assurance with RoHS 3 and REACH, supporting sustainable procurement and global supply chain requirements
• Interchangeable reliability manufactured to ASME B18.21.1 specifications, guaranteeing dimensional consistency and compatibility
• Versatile inch-system compatibility designed for seamless integration with standard imperial fastener assemblies

Professional Applications & Engineering Value

These USS flat washers deliver critical engineering solutions where vibration resistance and corrosion protection are paramount. The zinc-plated steel construction forms a sacrificial barrier against moisture and chemical exposure, significantly reducing maintenance cycles in outdoor equipment, structural steel connections, and machinery assemblies. With precise 0.562" ID matching standard 1/2" screw sizes, they eliminate play and distribute clamping forces evenly across the 1.375" OD contact surface. This prevents joint failure, protects sensitive materials from galvanic corrosion, and maintains bolt preload under dynamic loading conditions—making them ideal for construction, manufacturing, and heavy equipment applications requiring ASME B18.21.1 compliance.

Specification Summary & Compliance

Manufactured to ASME B18.21.1 dimensional standards with inch-system tolerances. Features zinc-plated steel material with 0.562" inner diameter, 1.375" outer diameter, and 0.086-0.132" thickness range. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, including SVHC compliance as of June 2023. Designed specifically for use with 1/2" fasteners in general-purpose and heavy-duty applications.