Is 35 mm a pretty common size for square stainless steel tubing in Europe?
I have a German-built machine with some square tubes spanning a space inside and they measure about that (it’s a tough place to measure and hard to get closer than maybe a couple millimeters). But it sounds like an odd size and there’s no reason they need to be any particular size; if it was arbitrary I would have thought 30 or 40 or 50 would have been a more common size.
If you found a tube that for no special reason measured around this size would you think “that’s ordinary 35 mm tubing” or would you think “that’s weird, we should try harder to check the size”?
I can buy 1 3/4" tubing here in the US, but if I thought I found some in an analogous situation I’d schedule downtime so I could check more accurately, because it would be unexpected. If I measured near 2" I’d just figure I had a good number.