5/16-18 Tap Drill Size
Use a F drill for a 5/16-18 UNC tap — .2570" (6.53 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 |
|---|---|---|
| 1/4-28 UNF | #3 | .2130 |
| 5/16-24 UNF | I | .2720 |
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.