3/4 USS Flat Wash Zn

Overview

The 3/4 USS Flat Washer Zinc (09417) is designed for load distribution applications with threaded fasteners, particularly where a wider bearing surface is required.

A flat washer is a thin, round plate with a center hole engineered to distribute the load of a threaded fastener across a wider surface area, reducing the risk of material damage and fastener pull-through. USS flat washers feature a larger, wider body compared to SAE flat washers, which are machined to a tighter specification with a smaller outside diameter. This USS designation makes the 09417 well-suited for general-purpose bolted connections where maximum load spreading is a priority.

Technical Specifications

Technical Features

• USS wide-body profile with 2-inch outer diameter: Provides a larger bearing surface than SAE equivalents, distributing fastener load over a greater area to reduce stress concentration on mated materials.
• 3/4-inch inner diameter: Sized to fit 3/4-inch threaded fasteners for a secure, properly aligned fit without excessive play.
• Steel construction: Delivers the structural integrity and hardness required for reliable performance in bolted assemblies under mechanical load.
• Zinc finish: Provides a corrosion-resistant coating that extends service life in general-purpose environments and protects against surface oxidation.
• Grade 2 / A307 hardness rating: Meets established standards for general fastener applications, ensuring consistent mechanical properties across the batch.
• Sold in 20-piece packages: Allows for efficient procurement for small to mid-scale fastening projects.

Applications

• General construction and structural bolted connections requiring broad load distribution
• Wood-to-metal and wood-to-wood fastening assemblies where pull-through resistance is needed
• Machinery assembly and maintenance using 3/4-inch threaded fasteners
• Any application specifying USS flat washer dimensions in lieu of the tighter-tolerance SAE standard