Most "clearance" drills are either 1/64" or 1/32" larger that the diameter of the bolt that's going to be used. For instance, a 33/64" or a 17/32" drill would be used to make a clearance hole for a 1/2" bolt.

https://amesweb.info/screws/Clearance-Hole-Chart.aspx

Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!