7/8-14 Tap Drill Size
Use a 13/16" drill for a 7/8-14 UNF tap — .8125" (20.64 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 |
|---|---|---|
| 7/8-9 UNC | 49/64 | .7656 |
| 1-8 UNC | 7/8 | .8750 |
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.