Description
The 2-3/4" USS Flat Washer is an oversized, heavy-duty washer specifically designed for use with 2-3/4-inch diameter bolts, screws, and studs. Engineered to meet United States Standard (USS) specifications, this washer features a wide outer diameter and thick body, ideal for distributing high clamping forces and minimizing surface deformation in extreme load applications.
Specifications:
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Inner Diameter (I.D.): 2-13/16"
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Outer Diameter (O.D.): 7"
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Thickness: 5/8" (nominal)
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Standard: USS (United States Standard)
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Material: Typically 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 Load Distribution: Extra-wide outer diameter spreads fastener pressure over a large surface area, protecting structural components from stress and embedment.
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Sized for 2-3/4" Fasteners: Designed with appropriate clearance to allow easy installation while maintaining bolt alignment and performance.
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USS Tolerance Profile: Looser fit than SAE washers—ideal for large-scale industrial or infrastructure applications with alignment tolerance requirements.
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Flat, Durable Surface: Ensures even load transfer and reliable torque control during tightening under extreme pressure.
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Finish Versatility: Available in corrosion-resistant options to suit indoor, outdoor, marine, and chemically exposed environments.
Common Applications:
The 2-3/4" USS washer is used in the most demanding structural and mechanical fastening situations, including:
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Bridge and large-scale infrastructure projects
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Mining and oilfield machinery
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Heavy steel fabrication and framing
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Energy sector and utility installations
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OEM manufacturing and equipment repair involving oversized fasteners
