All the fastener threaded open nuts are now available for you to download. The available sizes are all 1.0 BlockUnits wide and spanning from 0.25 to 4.0 BlockUnits long. The STL files are available from this link

Please note that the nut Nut RH BU01.00x5mm - SPN-NUT-0001, measuring 5 mm, is the most common nut used in the STEMFIE construction set standard.

Fasteners Nuts Open Group Image