#10-32 Tap Drill Size
Use a #21 drill for a #10-32 UNF tap — .1590" (4.04 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 |
|---|---|---|
| #10-24 UNC | #25 | .1495 |
| 1/4-20 UNC | #7 | .2010 |
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.