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Jamestown Distributors (wwww.jamestowndistributors.com) carries 316 SS bolts, washers, nuts, and a lot of other, hard-to-find hardware.
I replaced a 1 1/2" diameter 304 SS keel pin about 10 years ago, when I started getting water weeping past the seals due to pitting corrosion. We used 316 SS for this below-the-waterline application and haven't had any more problems. Unfortunately, this was not a catalog item and had to be custom machined.
Agree with some other folks that you might be overthinking this unless you have a specific requirement for 316 SS.