US TAP AND DRILL BIT SIZE TABLE
| Tap | Fractional Drill Bit | Number Drill Bit | Letter Drill Bit |
|---|---|---|---|
| 0-80 | 3/64 | ||
| 1-64 | 53 | ||
| 2-56 | 50 | ||
| 3-48 | 47 | ||
| 4-40 | 3/32 | 43 | |
| 5-40 | 38 | ||
| 6-32 | 7/64 | 35 | |
| 8-32 | 29 | ||
| 10-24 | 5/32 | 25 | |
| 10-32 | 5/32 | 21 | |
| 12-24 | 11/64 | 16 | |
| 1/4-20 | 13/64 | 7 | |
| 1/4-28 | 7/32 | 3 | |
| 5/16-18 | 17/64 | F | |
| 5/16-24 | I | ||
| 3/8-16 | 5/16 | ||
| 3/8-24 | 21/64 | Q | |
| 7/16-14 | 23/64 | U | |
| 7/16-20 | 25/64 | ||
| 1/2-13 | 27/64 | ||
| 1/2-20 | 29/64 | ||
| 9/16-12 | 31/64 | ||
| 9/16-18 | 33/64 | ||
| 5/8-11 | 17/32 | ||
| 5/8-18 | 37/64 | ||
| 3/4-10 | 21/32 | ||
| 3/4-16 | 11/16 | ||
| 7/8-9 | 49/64 | ||
| 7/8-14 | 13/16 | ||
| 1-8 | 7/8 | ||
| 1-12 | 59/64 | ||
| 1-14 | 15/16 |