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Message: <blockquote data-quote="mbullen" data-source="post: 499132" data-attributes="member: 24594">Rivets would be aluminum in the length and diameter needed.  (*solid rivets - usually a brazier, modified brazier, or universal head.)Personally, I have used 316 stainless threaded hardware with some 3M 4200 sealant here.   It's well above the waterline.Stainless is indeed a dissimilar metal than aluminum, but is perfectly acceptable in the galvanic overlap chart.  The receiving aluminum makes a large footprint to disperse the reaction and the wood and the sealant will make a barrier.  Some folks go an extra mile with rubber and nylon washers for barriers but I haven't personally gone to those lengths.</blockquote>