Description
The 4" USS Flat Washer is an ultra-heavy-duty washer designed for use with 4-inch diameter bolts, screws, and studs. Manufactured to United States Standard (USS) dimensions, it features an oversized outer diameter and robust thickness—engineered to distribute extreme clamping forces, prevent surface damage, and enhance joint integrity in the most demanding structural and industrial environments.
Specifications:
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Inner Diameter (I.D.): 4-1/16"
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Outer Diameter (O.D.): 10"
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Thickness: 3/4" (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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Maximized Load Bearing: Extra-large O.D. provides optimal surface coverage to prevent pull-through and deformation under extreme loads.
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Sized for 4" Fasteners: Clearance hole ensures compatibility with nominal bolt sizing while allowing for manufacturing tolerances.
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USS Fit Profile: Provides a looser fit than SAE washers—ideal for large-scale fastening jobs where installation speed and alignment flexibility are essential.
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Flat, Durable Surface: Delivers consistent torque transfer and load stability during heavy fastening.
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Corrosion-Resistant Options: Available coatings support use in marine, industrial, and chemically harsh environments.
Common Applications:
The 4" USS washer is engineered for critical-use scenarios involving oversized fasteners, including:
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Bridge and infrastructure construction
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Oil, gas, and mining operations
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Heavy steel fabrication and anchor bolt assemblies
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Utility and power generation facilities
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OEM machinery and large-equipment repair
