"A Well moderated board that is a benevolent dictatorship, not a democracy" In business since June 16, 2010
Quote from: J.A.F.E. on July 05, 2020, 01:27:21 AM31/64 is needed for 9/16-12 and 33/64 is needed for 9/16-18. No set is complete without them.So he needs the 30 piece set For tapping it's best to buy the individual sizes you need rather than a fractional set. The correct tap drill will be a number or a letter more often than not. I've got sets of jobbers but I mostly run screw machine length drills.
31/64 is needed for 9/16-12 and 33/64 is needed for 9/16-18. No set is complete without them.