Description
The 4-1/2" USS Flat Washer is a high-strength, heavy-duty washer designed for use with 4-1/2-inch diameter bolts, screws, and studs. Manufactured to United States Standard (USS) specifications, this washer features an expansive outer diameter and thick body, making it ideal for spreading heavy loads and protecting joint materials in extreme fastening environments such as infrastructure, marine, and energy-sector applications.
Specifications:
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Inner Diameter (I.D.): 4-9/16"
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Outer Diameter (O.D.): 11"
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Thickness: 7/8" (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 finishes
Key Features:
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Heavy Load Distribution: Oversized outer diameter spreads clamping force across a wider area, reducing material stress and preventing pull-through or crushing.
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Optimized for 4-1/2" Fasteners: Clearance hole allows for bolt tolerance while maintaining secure, stable alignment.
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USS Fit Standard: Looser tolerance fit than SAE washers—ideal for large-scale and alignment-sensitive structural work.
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Thick, Flat Surface: Ensures even torque application and reliable joint integrity under high-pressure tightening.
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Durable Finish Options: Available coatings protect against corrosion in harsh indoor, outdoor, or marine environments.
Common Applications:
The 4-1/2" USS washer is built for critical, high-load industrial settings, such as:
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Bridge, dam, and highway infrastructure
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Heavy steel construction and anchoring systems
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Energy generation and distribution facilities
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Offshore, marine, and subsea installations
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OEM production and industrial field repairs
