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Square washers are used to distribute the load of a threaded fastener. They are typically thicker and have a larger area than round washers for better torque distribution. Additionally, they fit in slots or channels to prevent rotation. Aside from load distribution, square washers are commonly used as shims to protect the materials being fastened while applying greater clamping force. They are considered a higher-performance alternative to round washers that make them suitable in industrial machinery, construction, and aerospace industries. Square washers are available in various sizes and thickness depending on the application.