Frank,
I would always recommend using the highest quality fasteners that you can find. On some of my show racing engines, I've used stainless steel because I can polish it to a chrome-like luster prior to installation. Just remember, whatever you finally decide to use, to be careful to document the grade and source of your fasteners.
A few years ago, some fasterners that were supposed to be high quality ended up as rotor securing bolts for some of our military helicopters. The bolts were fradulently graded and started breaking under stress, crashing military helicopters and even costing some lives. Be sure to check out your source of fasteners very carefully, especially when parts are now coming from all over the world.
thanks,
Paul A Christner
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