Description
The 1-1/2" USS Flat Washer is a robust, general-purpose washer engineered for use with 1-1/2-inch diameter bolts, screws, and studs. Designed to meet United States Standard (USS) specifications, this washer features a wide outer diameter and heavy-duty thickness, making it ideal for spreading loads, minimizing embedment, and protecting joint materials in demanding applications.
Specifications:
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Inner Diameter (I.D.): 1-9/16"
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Outer Diameter (O.D.): 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; 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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Expanded Load Surface: The large outer diameter disperses clamping force over a broader area, reducing surface damage and enhancing joint stability.
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Optimized for 1-1/2" Fasteners: Designed with a clearance hole to allow proper fitment and ease of installation.
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USS Standard Fit: Provides a looser fit compared to SAE washers—ideal for structural and heavy-duty applications requiring tolerance flexibility.
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Flat, Consistent Surface: Improves torque control, reduces friction, and ensures even tightening across the joint.
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Durable Finishes Available: Suited for use in indoor, outdoor, marine, or corrosive environments depending on coating selection.
Applications:
The 1-1/2" USS washer is frequently used in high-strength structural and mechanical fastening environments, such as:
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Industrial steel framing and plate connections
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Agricultural, mining, and construction equipment
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Bridge, highway, and utility infrastructure
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Heavy trailer and vehicle chassis assembly
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OEM machinery manufacturing and field repair
