5/8-18 Tap Drill Size
Use a 37/64" drill for a 5/8-18 UNF tap — .5781" (14.68 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 |
|---|---|---|
| 5/8-11 UNC | 17/32 | .5312 |
| 3/4-10 UNC | 21/32 | .6562 |
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.