SAE Flat Washers fit tighter on a Bolt or a Screw than a USS Flat Washer, as they have a smaller I.D. (Internal Diameter). The O.D. (Outer Diameter) of a SAE Washer is also smaller than that of a USS Flat Washer.
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Ro-Brand Products, Inc.
319 Cooke Street
Plainville, CT 06062
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