Description
The 2-1/4" USS Flat Washer is a large-diameter, heavy-duty flat washer engineered for use with 2-1/4-inch diameter bolts, screws, and studs. Built to meet United States Standard (USS) dimensions, this washer offers a broad outer diameter and thick profile designed to evenly distribute high clamping forces and prevent damage to mating surfaces in structural, industrial, and infrastructure-grade applications.
Specifications:
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Inner Diameter (I.D.): 2-5/16"
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Outer Diameter (O.D.): 6"
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Thickness: 1/2" (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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Oversized Load-Bearing Surface: Large outer diameter ensures optimal distribution of fastener load, reducing stress and deformation on base materials.
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Clearance for 2-1/4" Fasteners: Provides proper spacing and alignment with generous tolerance for ease of installation.
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USS Tolerance Profile: Designed with a looser fit than SAE washers—ideal for applications requiring flexibility and strength.
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Flat, Smooth Surface: Enhances torque accuracy and improves joint integrity during high-load tightening.
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Available Corrosion Protection: Wide range of protective finishes makes this washer suitable for harsh, marine, and corrosive environments.
Common Applications:
The 2-1/4" USS flat washer is designed for use in the most demanding settings, including:
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Bridge and structural steel construction
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Heavy equipment and earth-moving machinery
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Utility and energy infrastructure installations
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Industrial-grade fastening systems
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OEM and field-service applications requiring large-diameter fasteners
