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#4 USS Flat Washers

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 
YANKEENHUSS Flat Washer300 Stainless (A1,A2, 18-8,304,310 etc.)Plain#4#4 uss flat washer stainless300
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YANKEENHUSS Flat WasherSteelPhosphate#4USS flat cold rolled blk phosphate674
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OSSCORIUSS Flat WasherBrassPlain#4#4 flat uss brass b18.22.11,600
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