S-90108A415 0.375" ID x 0.875" 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, extending service life in harsh industrial environments
- Precise dimensional fit with 0.375" ID and 0.875" OD ensuring optimal load distribution for 5/16" screws
- Enhanced durability through controlled thickness (0.064-0.104") providing consistent performance under pressure
- Industry-standard compliance with ASME B18.21.1 specifications guaranteeing reliable mechanical properties
- Environmental responsibility with full RoHS 3 and REACH compliance for safe, sustainable operations
- Versatile USS designation offering robust support for heavy-duty applications requiring reliable fastening
- Reduced maintenance costs through long-lasting zinc plating that resists rust and degradation
Professional Applications & Engineering Value
These USS flat washers deliver exceptional engineering value in demanding industrial settings where corrosion resistance and load distribution are critical. The zinc-plated steel construction provides a protective barrier against moisture and chemicals, significantly reducing failure risks in outdoor equipment, machinery assemblies, and structural frameworks. With precise inch measurements (0.375" ID, 0.875" OD) and consistent thickness, these washers prevent fastener loosening, distribute clamping forces evenly, and protect sensitive surfaces from damage. Ideal for heavy-duty applications including construction, automotive, and manufacturing, they solve common pain points like galvanic corrosion, surface deformation, and premature fastener wear while maintaining ASME B18.21.1 standards for reliability.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 standards with precise inch dimensions: 0.375" inner diameter, 0.875" outer diameter, and 0.064-0.104" thickness range. These USS flat washers maintain standard dimensional tolerances for consistent performance with 5/16" fasteners. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and chemical restriction adherence.
