Description
The 1" USS Flat Washer is a heavy-duty, general-purpose washer designed for use with 1-inch diameter bolts, screws, and studs. Conforming to United States Standard (USS) specifications, it offers a larger outer diameter and moderate thickness, making it ideal for distributing fastener loads across wider surface areas and protecting mating materials from damage.
Specifications:
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Inner Diameter (I.D.): 1-1/16"
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Outer Diameter (O.D.): 2-3/4"
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Thickness: 1/4" (nominal)
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Standard: USS (United States Standard)
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Material: Commonly 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 coatings
Key Features:
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Large O.D. Profile: Spreads clamping force across a broader area, reducing risk of pull-through or indentation on softer surfaces.
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Optimized for 1" Fasteners: Clearance hole provides tolerance for easy alignment and installation.
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USS Dimensional Standard: Offers looser fit than SAE washers, allowing more flexibility in high-tolerance and structural applications.
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Smooth Surface: Enhances torque consistency and reduces friction during fastener tightening.
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Versatile Finishes: Available in a range of corrosion-resistant options for indoor, outdoor, and harsh environments.
Common Applications:
This washer is frequently used in medium- to heavy-duty structural, mechanical, and industrial settings, such as:
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Steel construction and framing
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Heavy equipment and trailer assemblies
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Agricultural and earth-moving machinery
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Utility and infrastructure installations
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OEM production and maintenance repair operations
