9/16-18 Tap Drill Size
Use a 33/64" drill for a 9/16-18 UNF tap — .5156" (13.10 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 |
|---|---|---|
| 9/16-12 UNC | 31/64 | .4844 |
| 5/8-11 UNC | 17/32 | .5312 |
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.