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2 1/2 USS Flat Washers (ASME B18. 22.1)

USS Flat Washers were among the first known commercial flat washers in the U.S.A. They are characterized as having a loose fit, and have a larger outside diameter than SAE Flat washers. The USS designation was derived from the name “Unified Standard Series.” At the time, coarse threaded bolts were called USS bolts.

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SupplierLocTypeMaterialFinishSizeDescriptionQty 
AbabaCAUSS Flat WasherSteelPlain2 1/2-52-1/2 uss f/w stl pln (5 od) b18.22.19
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BHAMALUSS Flat WasherSteelPlain2 1/22-1/2 uss flat b18.22.1110
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BHAMALUSS Flat WasherSteelPlain2 1/22 1/2 uss flat dom b18.22.119
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General FMIUSS Flat WasherSteelZinc/Yellow2 1/22-1/2 uss hrdnd fw zinc yellow b18.22.174
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THRDFASTFLUSS Flat WasherSteelGalvanized2 1/2USS f/w hdg b18.22.135
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THRDFASTFLUSS Flat WasherSteelPlain2 1/2USS f/w b18.22.13
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THRDFASTALUSS Flat WasherSteelGalvanized2 1/2USS f/w hdg b18.22.1432
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THRDFASTOKUSS Flat WasherSteelPlain2 1/2USS f/w b18.22.14
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