Use this interactive tap drill size chart to find the correct drill bit for any UNC, UNF or metric thread. Search a size or filter by thread type.
Tap Drill Size Chart
Find the correct tap drill for any thread. Search a size (e.g. “1/4-20” or “M6”) or filter by thread type.
| Thread size | Type | Tap drill | Decimal (in) |
|---|
Tap drills shown give ~75% thread. For a full drill cross-reference, see our drill bit size chart.
Need to convert those drill sizes? Try our drill bit size converter or the full drill bit size chart.