Posted 3/4/2018 16:23 (#6619773 - in reply to #6614365) Subject: RE: Drill bit to hole size question....
North Central Kansas
One advantage of drilling size on size (1/2" bit for 1/2" bolt for example) is that the bolt sort of acts like a dowel pin.
It not only ensures more precise alignment of the mating parts but can also prevent the start of any movement that over time will wear out the holes.