Home › Drill size chart › X drill
X drill bit size
X drill = .3970 in = 10.08 mm. Closest metric drill: 10.1 mm.
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| 3/8 | fraction | .3750 in | 9.525 | -22.0 thou |
| V | letter | .3770 in | 9.576 | -20.0 thou |
| W | letter | .3860 in | 9.804 | -11.0 thou |
| 25/64 | fraction | .3906 in | 9.922 | -6.4 thou |
| X | letter | .3970 in | 10.084 | 0.0 thou |
| Y | letter | .4040 in | 10.262 | 7.0 thou |
| 13/32 | fraction | .4063 in | 10.319 | 9.2 thou |
| Z | letter | .4130 in | 10.490 | 16.0 thou |
| 27/64 | fraction | .4219 in | 10.716 | 24.9 thou |
1 thou = 0.001 in = 0.0254 mm. Drills a few thou apart are usually interchangeable for clearance holes, but not for tap drills or reamer pilots.