There is a comprehensive nut and bolt reference in the Literature Section of this very forum. It is the first entry at the moment. With part numbers from your own reference or Draganfly's online catalogue, identification of nuts, bolts, studs and washers is easy. The chart tells you what size and thread the various part numbers are.
A cheap set of Cycle Thread taps and dies to clean up powder coated threads will save hours of frustration. Cheap carbon steel will do. Even new threads can benefit from a quick clean up, as in some cases the manufacturing tolerances between old original parts and modern ones are not quite right for easy assembly. I would recommend threadlock on all fastenings, as this will also aid dismantling in the future as well as holding things together, whether you go for stainless or mild steel.
Request... Admin can you please post links once again to these handy references. Thanks.
Swarfy....good with a spanner, crap at linking websites.