Home › Drill size chart › #23 drill
#23 drill bit size
#23 drill = .1540 in = 3.91 mm. Closest metric drill: 3.9 mm.
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| #27 | number | .1440 in | 3.658 | -10.0 thou |
| #26 | number | .1470 in | 3.734 | -7.0 thou |
| #25 | number | .1495 in | 3.797 | -4.5 thou |
| #24 | number | .1520 in | 3.861 | -2.0 thou |
| #23 | number | .1540 in | 3.912 | 0.0 thou |
| 5/32 | fraction | .1563 in | 3.969 | 2.3 thou |
| #22 | number | .1570 in | 3.988 | 3.0 thou |
| #21 | number | .1590 in | 4.039 | 5.0 thou |
| #20 | number | .1610 in | 4.089 | 7.0 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.