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Stainless steel bolting

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Has anyone found a good solution to the problem with galling of the
threads for stainless steel fasteners?  This specific application is
under water, so a coating may not work.  Also, the water is high in
chloride and sulfate ions, so galvanic corrosion of dissimilar metals is
likely.  Our contractor has suggested making the bolts a 400-series
stainless and furnishing 316 stainless nuts as specified.