I'm a big fan of 3M DP-420 (it's also available in black). I don't recommend it for this application. It's a great adhesive with really good peel strength, but those properties require it to be kind of soft and creep under continuous load(bolt clamp). I recommend a metal filled epoxy like JB weld. It's cheaper and more readily available and should have much less creep.
If you want something a little better you can spring for the titanium filled "repair" epoxy from Devcon.
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