Tommy Mac Discussions › Forums › Fix-it Forum: Home Improvement & Do It Yourself Repair Forum › drill bit sizes for ng orifices › number size drills
I grabbed a copy of a nationally distributed industrial tool catalog and got a chart from number 97, .0059″, thru letter z and on to 1-11/64″. There are only a few large industrial tool catalogs covering everything that might be used in a large machine shop but the catalogs have with covers added for small tool distributors across the country.
For the drills, industrial supply houses are a good source, particularly to number 80 but hobby shops stock or can get them up in number to 90.
Henry in MI