Most of the ones I was cutting out were 5/8" rivets in 3500 Chevy trucks when I worked at the local Chevy dealer years ago. My new at the time Snap On air chisel would do it, but it was so much faster cutting the head as I described.
Have to do the + thing with ford bed bolts and their stupid self tapping J nuts or as Ford calls them... " special nut". Ya 5/8 needs some help from the cutt-off wheel.
