I can't open this page:

> > For example, http://www.mcmaster.com/#plug-gauges/=1lpzq2

but the table on the page found by entering 'plug gauges' one can see tolerance
Z which is +/- 2.5 um ?! I don't think so, at least not in plastic or FR4 holes.
The pin collar would simply go through forcing its was on. I think that one
needs a 20um collar to feel it in plastic. 20um is only 5% of the diameter for a
0.5mm hole. Either that or these pin gauges are collar-less.

Peter


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