Posted 3/2/2018 15:55 (#6615642 - in reply to #6614365) Subject: RE: Drill bit to hole size question....
N.E. MO
I always oversize bolt holes unless they are to be tapped or some other special circumstance. In the structural world, code calls for bolt holes to be oversized by 1/16" for steel to steel connections. You don't want any sort of binding between the bolt and the hole, or it can interfere with the clamping action of the tightened bolt, which is what you are trying to achieve.