3/8-16 Tap Drill Size
Use a 5/16" drill for a 3/8-16 UNC tap — .3125" (7.94 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 |
|---|---|---|
| 5/16-24 UNF | I | .2720 |
| 3/8-24 UNF | Q | .3320 |
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.