Home > Technical > Tables and Charts > Tap Drill Size
| Nominal Tap Size | Drill Size | |
| Cut Tap | Form Tap | |
| 0-80 | 3/64 | 54 |
| 1-64 | 53 | 51 |
| 1-72 | 53 | 51 |
| 2-56 | 50 | 5/64 |
| 2-64 | 50 | 47 |
| 3-48 | 47 | 43 |
| 3-56 | 46 | 2.3mm |
| 4-40 | 43 | 38 |
| 4-48 | 42 | 2.6mm |
| 5-40 | 38 | 33 |
| 5-44 | 37 | 2.9mm |
| 6-32 | 36 | 1/8 |
| 6-40 | 33 | 3.25mm |
| 8-32 | 29 | 25 |
| 8-36 | 29 | 24 |
| 10-24 | 26 | 11/64 |
| 10-32 | 21 | 16 |
| 12-24 | 16 | 8 |
| 12-28 | 15 | 7 |
| 1/4-20 | 7 | 1 |
| 1/4-28 | 3 | 15/64 |
| 5/16-18 | F | L |
| 5/16-24 | I | M |
| 3/8-16 | 5/16 | S |
| 3/8-24 | Q | T |
| 7/16-14 | U | Y |
| 1/2-13 | 27/64 | 15/32 |
| 1/2-20 | 29/64 | 12.25mm |
| 9/16-12 | 31/64 | 17/32 |
| 9/16-18 | 33/64 | 13.5mm |
| 5/8-11 | 17/32 | 14.75mm |
| 5/8-18 | 37/64 | 15.25mm |
| 3/4-10 | 21/32 | 45/64 |
| 3/4-16 | 11/16 | 23/32 |
| 7/8-9 | 49/64 | -- |
| 7/8-14 | 13/16 | -- |
| 1-8 | 7/8 | -- |
| 1-12 | 59/64 | -- |
| 1-1/8 - 7 | 63/64 | -- |
| 1-1/8 - 12 | 1-19/64 | -- |
| 1-1/4 - 7 | 1-7/64 | -- |
| 1-1/4 - 12 | 1-11/64 | -- |
| 1-3/8 - 6 | 1-7/32 | -- |
| 1-3/8 - 12 | 1-19/64 | -- |
| 1-1/2 - 6 | 1-11/32 | -- |
| 1-1/2 - 12 | 1-27/64 | -- |
| 1-3/4 - 5 | 1-9/16 | -- |
| 2 - 4-1/2 | 1-25/32 | -- |