The 10-32 screws rattle around in the hole. I think they would just strip out if you tried to get them tight.
I was actually surprised that I did not find them on a European or Asian web site tho.
These connectors are Hecho en India. Maybe it is an old BA size or something.
Tesla, the connector is galvanized and I am painting it but the screws are just common steel. They will rust in place and you will never get them out if you want to.
BTW this is not going to be a raceway, I am making a frame for a canopy awning. EMT just seemed to be a handy material that I had the tools to work with.
The screw in the center is the one I am going for.