Wow, is that all? Are they an interference fit then? Do you chill the stud and warm the hub first?
Interference fit is correct. Just press them in at room temperature but protect the end of the non threaded stud with brass and protect the threaded stud with a nut. Heat the peened end after pressing to soften the steel for peening. I use a jewelers torch to do that task because the tip is mini and the flame hits only the peening area.