Description
The 3-1/4" USS Flat Washer is a heavy-duty flat washer designed for use with 3-1/4-inch diameter bolts, screws, and studs. Built to United States Standard (USS) specifications, this washer features an expansive outer diameter and substantial thickness, providing enhanced load distribution and surface protection in large-scale industrial and structural assemblies.
Specifications:
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Inner Diameter (I.D.): 3-5/16"
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Outer Diameter (O.D.): 8-1/2"
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Thickness: 11/16" (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 other corrosion-resistant coatings
Key Features:
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Oversized Load Distribution: Extra-large O.D. spreads clamping forces over a wide area, reducing embedment and protecting structural surfaces.
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Clearance for 3-1/4" Fasteners: Provides tolerance for fastener alignment while maintaining stability and integrity under load.
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USS Fit Profile: Offers a looser fit than SAE washers, ideal for heavy-duty applications requiring flexibility and ease of installation.
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Flat, Solid Construction: Ensures even torque transfer and strong joint performance under high pressure.
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Corrosion-Resistant Options: Available in multiple finishes for use in indoor, outdoor, marine, or chemically exposed environments.
Common Applications:
The 3-1/4" USS washer is engineered for extreme-duty industrial and structural use, including:
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Bridge and infrastructure assembly
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Heavy steel fabrication and anchor systems
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Energy, marine, and offshore installations
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Large equipment and OEM assemblies
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Maintenance and field-repair of high-load joints
