Description
The 1-5/8" USS Flat Washer is a high-strength, general-purpose washer specifically designed for use with 1-5/8-inch diameter bolts, screws, and studs. Built to United States Standard (USS) dimensions, this washer features a wide outer diameter and substantial thickness to effectively distribute load, reduce surface wear, and improve joint stability in structural and industrial applications.
Specifications:
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Inner Diameter (I.D.): 1-11/16"
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Outer Diameter (O.D.): 4-1/4"
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Thickness: 3/8" (nominal)
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Standard: USS (United States Standard)
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Material: Commonly 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 protective coatings
Key Features:
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Extended Bearing Surface: Wide O.D. helps distribute clamping forces over a larger area, minimizing embedment and deformation of base materials.
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Designed for 1-5/8" Fasteners: Clearance hole ensures compatibility with nominal fastener size while accommodating typical manufacturing tolerances.
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USS Specification Fit: Provides a looser fit than SAE washers—ideal for general-purpose and large-scale fastening jobs.
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Flat, Smooth Surface: Promotes even torque application and consistent load transfer.
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Corrosion-Resistant Options: Multiple finish types available to suit a range of environments, from indoor installations to outdoor or marine exposure.
Common Applications:
The 1-5/8" USS washer is well-suited for demanding fastening scenarios, including:
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Heavy steel construction and plate assemblies
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Agricultural, earth-moving, and industrial machinery
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Structural framework in bridges and public infrastructure
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Utility and energy-sector installations
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OEM equipment and field service repairs
