US Tap Drill Chart
| NATIONAL COARSE |
NATIONAL FINE |
|||
| TAP | DRILL | TAP | DRILL | |
| SIZE | SIZE | SIZE | SIZE | |
| #0-80 | 3/64″ | #1-72 | #53 | |
| #1-64 | #53 | #2-64 | #50 | |
| #2-56 | #51 | #3-56 | #46 | |
| #3-48 | 5/64″ | #4-48 | #42 | |
| #4-40 | #43 | #5-44 | #37 | |
| #5-40 | #39 | #6-40 | #33 | |
| #6-32 | #36 | #8-36 | #29 | |
| #8-32 | #29 | #10-32 | #21 | |
| #10-24 | #25 | #12-28 | #15 | |
| #12-24 | #17 | 1/4-28 | #3 | |
| 1/4-20 | #7 | 5/16-24 | I | |
| 5/16-18 | F | 3/8-24 | Q | |
| 3/8-16 | 5/16 | 7/16-20 | W | |
| 7/16-14 | U | 1/2-20 | 29/64 | |
| 1/2-13 | 27/64 | 9/16-18 | 33/64 | |
| 9/16-12 | 31/64 | 5/8-18 | 37/64 | |
| 5/8-11 | 17/32 | 3/4-16 | 11/16 | |
| 3/4-10 | 21/32 | 7/8-14 | 13/16 | |
| 7/8-9 | 49/64 | 1″-14 | 15/16 | |
| 1″-8 | 7/8 | 1-1/8-12 | 1-3/64 | |
| 1-1/8-7 | 63/64 | 1-1/4-12 | 1-11/64 | |
| 1-1/4-7 | 1-7/64 | 1-1/2-12 | 1-27/64 | |
| 1-1/2-6 | 1-11/32 | 1-3/4-12 | 1-43/64 | |
| 1-3/4-5 | 1-35/64 | 2″-12 | 1-59/64 | |
| 2″-4-1/2 | 1-25/32 | |||