Description
The 1-1/4" USS Flat Washer is a high-strength, general-purpose washer engineered for use with 1-1/4-inch diameter bolts, screws, and studs. Manufactured to United States Standard (USS) dimensions, this washer offers a generous outer diameter and substantial thickness—ideal for distributing heavy loads and minimizing surface stress in industrial-grade fastening applications.
Specifications:
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Inner Diameter (I.D.): 1-5/16"
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Outer Diameter (O.D.): 3-1/2"
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Thickness: 5/16" (nominal)
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Standard: USS (United States Standard)
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Material: Typically low carbon steel; also offered in stainless steel, brass, or specialized alloys
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Finish Options: Plain, zinc-plated, hot-dip galvanized, black oxide, or other corrosion-resistant treatments
Key Features:
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Large Outer Diameter: Effectively spreads fastener pressure to reduce damage to base materials, especially in oversized or softer substrates.
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Clearance Fit for 1-1/4" Fasteners: Designed with tolerance for easier bolt insertion without compromising structural integrity.
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USS Tolerances: More forgiving than SAE washers—ideal for applications requiring alignment flexibility and robust load bearing.
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Flat Precision Surface: Enhances torque control and tightening accuracy while minimizing wear.
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Protective Coating Options: Available in corrosion-resistant finishes for long-term use in both indoor and extreme environments.
Common Applications:
This washer is built for high-load and large-scale fastening systems, often found in:
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Bridge and highway construction
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Agricultural, industrial, and mining equipment
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Steel building frames and heavy infrastructure
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Trailer and heavy vehicle fabrication
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OEM and field-repair mechanical systems
