Greg, matters just as much here. Captain Mo, there are people who like to say "minor surface corrosion", and I am refering to them as a group. BTW< Brian, I dont think its hilti... I think its your standard "whatever" at the hardware store. Hiliti KBll's have that larger nut. That nut looks small, like its imperial rather than metric.
FWIW, all three hardware stores where I have worked stocked only Rawl brand anchor bolts.
The mixed metals will lead to other, non visible weaknesses in the structural integrity of the hanger and the bolt. Where are the engineers/chemists on this thread?
Ummm, No. I'm one of the engineers on this thread, and the issue with mixed metals is that it may cause galvanic corrosion (i.e. rusting of the bolt where it contacts the hanger). In this case, because the hanger is painted, there is probably no contact between the two types of metal, so galvanic corrosion won't occur (unless the paint has been scratched off or something).