Description
The 1-3/8" USS Flat Washer is a rugged, general-purpose washer designed to accommodate 1-3/8-inch diameter bolts, screws, and studs. Built to United States Standard (USS) specifications, this washer features a large outer diameter and durable thickness to effectively distribute load and minimize surface deformation in high-stress fastening assemblies.
Specifications:
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Inner Diameter (I.D.): 1-7/16"
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Outer Diameter (O.D.): 3-3/4"
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Thickness: 3/8" (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 specialized alloys
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Finish Options: Plain, zinc-plated, hot-dip galvanized, black oxide, or other protective coatings
Key Features:
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Wide Bearing Surface: Large O.D. effectively spreads clamping force, protecting work surfaces from damage or crushing.
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Sized for 1-3/8" Fasteners: Provides appropriate clearance for oversized bolts, allowing easy installation while ensuring reliable alignment.
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USS Fit Profile: Offers a looser fit than SAE washers, making it well-suited for general-purpose and structural applications.
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Smooth, Flat Surface: Promotes even torque distribution and improved tightening performance.
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Corrosion Protection Options: Multiple finishes available for use in indoor, outdoor, marine, or chemically exposed environments.
Typical Applications:
This washer is ideal for industrial and structural settings that require high load distribution and secure fastening, such as:
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Steel construction and bridge framing
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Agricultural and heavy construction equipment
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Marine, mining, and energy infrastructure
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Utility and highway installations
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OEM manufacturing and field maintenance
