In my own shop, I am, kicking and screaming, "inching" towards the metric system.? I have a rather complete and well-organized set of little drawers for my SAE hardware, but the metric stuff heretofore has been in a couple of drawers marked only with the diameter; all lengths, plus nuts, washers, etc. have been jumbled together.? (Better than in my lab, where there's just a drawer labeled "metric".)? So I'm doing one of my obsessive-compulsive sorting and labeling projects to create a new cabinet specifically for all the metric stuff.
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The point of all this is that, in the US anyway, M3.5 isn't all that rare.? It's definitely less common than the integer sizes, but in my jumbled lot, captured from taking things apart and various small purchases, there is still quite a bit of M3.5 stuff.? I'm surprised that it would be so hard to source in an ostensibly metric country.? There's certainly plenty of M3.5 hardware to be found on Amazon.
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Mark
