3/8-24 Tap Drill Size
Use a Q drill for a 3/8-24 UNF tap — .3320" (8.43 mm).
This drill gives roughly 75% thread, the standard for cut taps. For a form (roll) tap use the larger drill from the tap maker's chart.
Nearby taps
| Tap | Drill | Decimal |
|---|---|---|
| 3/8-16 UNC | 5/16 | .3125 |
| 7/16-14 UNC | U | .3680 |
Printable PDF version - Tap Drill Chart
Clean letter-size sheet for the toolbox or shop wall. Instant download, $3.49.
Clean letter-size sheet for the toolbox or shop wall. Instant download, $3.49.