S-90108A032 0.5" ID x 1.25" OD ASME B18.21.1 USS Washers
USS Washers
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Basic Information
Dimension Parameters
Material & Strength Parameters
Installation & Application Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
- Optimal load distribution across the 1.25" OD surface to prevent joint loosening and material damage
- Precise 0.5" ID fit ensures secure seating on 7/16" fasteners without slippage or misalignment
- ASME B18.21.1 compliance guarantees dimensional accuracy and consistent performance in industrial assemblies
- Enhanced durability through controlled thickness (0.064-0.104") providing reliable spacing and vibration resistance
- Environmental compliance with RoHS 3 and REACH regulations for safe use in global supply chains
- Universal inch system compatibility for seamless integration with existing USS-standard equipment and components
Professional Applications & Engineering Value
These USS flat washers address critical engineering challenges in industrial applications where vibration-induced loosening and corrosion compromise assembly integrity. The zinc-plated steel construction creates a protective barrier against moisture and chemical exposure, significantly extending maintenance intervals in outdoor equipment, machinery frames, and structural supports. With precise 0.5" ID matching 7/16" screw sizes, these washers eliminate play while the 1.25" OD distributes clamping force over wider areas - preventing surface deformation in soft materials and reducing stress concentration in load distribution scenarios. The standardized ASME B18.21.1 dimensions ensure interchangeability across maintenance operations and production lines.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 dimensional standards with 0.5" inner diameter and 1.25" outer diameter in inch measurement system. Thickness maintained between 0.064-0.104" for consistent performance. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, including the latest SVHC updates. Designed specifically for 7/16" fastener applications in USS flat washer configurations.
