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USS Flat Washers , Black Oxide (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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Buy USS Flat Washers from one of our FCH Network Members
SupplierLocTypeMaterialFinishSizeDescriptionQty 
AbabaCAUSS Flat WasherSteelBlack Oxide5/165/16 uss f/w extra thick hrd stl al-2000 black (7/8 od) b18.22.11213
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AbabaCAUSS Flat WasherSteelBlack Oxide1/4 uss f/w stl blk ox wax (3/4 od) b18.22.13275
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QFCTXUSS Flat WasherSteelBlack Oxide5/85/8 uss flat washer black oxide b18.22.1550
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QFCTXUSS Flat WasherSteelBlack Oxide1/21/2 uss flat washer black oxide b18.22.11958
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WSBKYUSS Flat WasherSteelBlack Oxide1/2washer flat uss a w st (bo) 1/2 b18.22.140,978
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