S-91081A131 0.438" ID x 1" 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 load distribution with 1" OD design to prevent surface damage and maintain joint integrity
- Precision dimensional accuracy with 0.438" ID ensuring perfect fit for 3/8" fasteners
- Durable steel construction providing reliable mechanical strength and corrosion resistance
- Industry-standard compliance with ASME B18.21.1 specifications for consistent performance
- Optimal thickness range (0.064-0.104") allowing for proper compression and vibration resistance
- Environmental compliance meeting RoHS 3 and REACH regulations for safe industrial use
- Versatile inch system compatibility for seamless integration with existing USS standard assemblies
Professional Applications & Engineering Value
These USS flat washers deliver exceptional engineering value in demanding industrial applications where reliable load distribution and surface protection are critical. The steel construction provides excellent durability against wear and environmental factors, while the precise 3/8" screw size compatibility ensures secure fastening without slippage or misalignment. The 1" OD design maximizes bearing surface area, effectively preventing bolt head or nut embedding into softer materials. These ASME B18.21.1 compliant washers are engineered to maintain joint integrity in mechanical assemblies, construction projects, and heavy equipment where vibration resistance and consistent performance are essential. The inch system measurement makes them ideal for maintenance, repair, and OEM applications requiring USS standard components.
Specification Summary & Compliance
Manufactured to ASME B18.21.1 standards with precise dimensional tolerances including 1" OD, 0.438" ID, and thickness range of 0.064-0.104". These steel flat washers are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for industrial applications worldwide. The USS designation confirms conformity with inch system requirements for reliable performance in standardized mechanical assemblies.
