Description
The 5" USS Flat Washer is an ultra-heavy-duty washer designed for use with 5-inch diameter bolts, screws, and studs. Manufactured to United States Standard (USS) specifications, this washer features a massive outer diameter and thick profile—engineered to distribute extremely high clamping loads, reduce material distortion, and protect structural surfaces in the most demanding industrial and infrastructure applications.
Specifications:
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Inner Diameter (I.D.): 5-1/16"
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Outer Diameter (O.D.): 12"
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Thickness: 1" (nominal)
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Standard: USS (United States Standard)
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Material: Typically low carbon steel; also available in stainless steel, brass, or specialty alloys
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Finish Options: Plain, zinc-plated, hot-dip galvanized, black oxide, or custom corrosion-resistant coatings
Key Features:
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Maximum Load Spreading: Extra-large O.D. effectively distributes clamping force over a broad surface area, minimizing embedment in softer materials and preventing bolt pull-through.
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Sized for 5" Fasteners: Clearance hole ensures compatibility with standard bolt tolerances for accurate and efficient installation.
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USS Standard Fit: Provides a looser tolerance fit compared to SAE washers, ideal for heavy construction and alignment-sensitive applications.
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Durable, Flat Surface: Promotes even torque application and joint integrity under extreme tightening conditions.
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Corrosion-Resistant Options: Available with industrial-grade coatings for marine, outdoor, and corrosive environment use.
Common Applications:
The 5" USS flat washer is purpose-built for the largest and most critical structural fastening requirements, including:
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Bridge and highway construction
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Offshore and marine infrastructure
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Energy-sector installations (wind, oil, gas)
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Heavy steel and anchor bolt assemblies
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OEM and field-repair work for massive industrial machinery
