the screws are almost all standard M3 screws (I think that means 3mm diameter). The lengths are all in mm. Typically 5mm, 10mm, 12mm, 15mm and so on. Someone recently posted what you have to search for in mcmaster carr to find them with the same screw head - they have a weird name.
The Ultimakers are made in Europe. So It's Metric all the way
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