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Description
xUSS (United States Standard) flat washers made from low carbon steel and zinc-plated are commonly used in general-purpose applications to distribute load and prevent damage to surfaces. While specific strength values for these washers are not typically provided due to their role as non-load-bearing components, their dimensions and material properties are standardized.
Standard Dimensions for USS Flat Washers (Low Carbon Steel, Zinc-Plated)
The following chart outlines typical dimensions for USS flat washers:
| Nominal Washer Size | Inside Diameter (in) | Outside Diameter (in) | Thickness Range (in) |
|---|---|---|---|
| 1/4" | 0.312 | 0.734 | 0.065 – 0.080 |
| 3/8" | 0.438 | 1.000 | 0.083 – 0.104 |
| 1/2" | 0.562 | 1.375 | 0.109 – 0.132 |
| 5/8" | 0.688 | 1.750 | 0.134 – 0.160 |
| 3/4" | 0.812 | 2.000 | 0.148 – 0.177 |
| 7/8" | 0.938 | 2.250 | 0.165 – 0.192 |
| 1" | 1.062 | 2.500 | 0.165 – 0.192 |
| 1-1/8" | 1.250 | 2.750 | 0.165 – 0.192 |
| 1-1/4" | 1.375 | 3.000 | 0.165 – 0.192 |
| 1-3/8" | 1.500 | 3.250 | 0.180 – 0.213 |
| 1-1/2" | 1.625 | 3.500 | 0.180 – 0.213 |
These dimensions adhere to the ASME B18.21.1 Type A Wide Series standard, ensuring consistency across manufacturers.
Material and Finish
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Material: Low Carbon Steel
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Finish: Zinc Plated (Fe/Zn 3AN per ASTM F1941/F1941M)
The zinc plating provides moderate corrosion resistance, suitable for indoor or mildly corrosive environments.
Mechanical Properties
As washers are designed primarily to distribute load rather than bear it, specific mechanical strength values are not typically specified. However, the low carbon steel used in these washers generally has a tensile strength of approximately 60,000 psi. It's important to note that for applications requiring higher strength or hardness, washers made from hardened steel (e.g., ASTM F436 washers) should be considered.
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