Description
The 3" USS Flat Washer is the largest standard-size washer in the USS series, purpose-built for use with 3-inch diameter bolts, screws, and studs. Manufactured to United States Standard (USS) specifications, it features an extra-wide outer diameter and substantial thickness to maximize load dispersion and prevent surface damage in the most extreme structural and industrial fastening applications.
Specifications:
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Inner Diameter (I.D.): 3-1/16"
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Outer Diameter (O.D.): 7-1/2"
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Thickness: 5/8" (nominal)
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Standard: USS (United States Standard)
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Material: Commonly low carbon steel; 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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Maximum Surface Coverage: Oversized outer diameter distributes high clamping forces evenly, reducing embedment and damage to mating surfaces.
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Precision Clearance Fit: Designed for use with 3" fasteners, allowing for straightforward alignment and installation with industry-standard tolerances.
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USS Fit Standard: Looser tolerance than SAE washers, enabling greater flexibility in high-tolerance and large-format assemblies.
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Heavy-Duty Performance: Thick body provides superior resistance to distortion under heavy torque and load.
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Versatile Protective Finishes: Suitable for corrosive, marine, outdoor, or industrial environments, depending on finish selection.
Typical Applications:
The 3" USS washer is used in some of the most demanding structural and mechanical environments, including:
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Bridge and large-scale infrastructure construction
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Oilfield and mining equipment assemblies
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Utility-scale energy installations
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Structural steel fabrication and support systems
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OEM and repair operations involving very large fasteners
