Thread prep
3/8-16 Tap Drill
Common shop chart tap drill for 3/8-16 UNC.
Last updated 2026-05-12Confidence: reference-derivedUNC
| Thread size | 3/8-16 |
|---|---|
| Tap drill | 5/16 |
| Decimal / mm | 0.3125 in / 7.938 mm |
| Normal clearance | 0.397 in |
| Percent thread | 75% reference |