Here we go, the professional has entered the comments.
The strength of PEM nuts is so much better than rivnuts. I designed parts for a missle system that had to be transported, and possibly air dropped, and rivnuts were not going to work when you have to handle 20g.
I had to knock a few of these out of sheet-metal case and man I did not expect that kind of resistance from something with such a tiny contact area in 0.8 mm sheet metal.
The strength of PEM nuts is so much better than rivnuts. I designed parts for a missle system that had to be transported, and possibly air dropped, and rivnuts were not going to work when you have to handle 20g.