Thanks everyone for your kind replies. The project is for a
supercharger pulley puller/installer that I am constructing. The
5/8"-18 bolt acts as the forcing screw and the hole is to put a press
fit locating pin (which, in turn, mates with the supercharger shaft).
Trying to stay on the cheap and use basic materials/techniques as
opposed to purchasing a 150+ dollar puller. Thanks again.