TAP DRILL SIZE CALCULATOR - ftp.amesweb.info
https://ftp.amesweb.info/Screws/tap-drill-size-calculator.aspx
WEBTap drill size calculator for thread size from 0.060 to 2 inch including 2-56, 4-40, 6-32, 8-32, 10-32, 1/4, 5/16, 3/8, 1/2, 5/8 and 3/4. For internal thread, tolerance classes 1B & 2B and 3B are available. For general use, select 1B & 2B thread class.
DA: 86 PA: 56 MOZ Rank: 15