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#22 drill bit size
#22 drill = .1570 in = 3.99 mm. Closest metric drill: 4 mm.
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| #25 | number | .1495 in | 3.797 | -7.5 thou |
| #24 | number | .1520 in | 3.861 | -5.0 thou |
| #23 | number | .1540 in | 3.912 | -3.0 thou |
| 5/32 | fraction | .1563 in | 3.969 | -0.8 thou |
| #22 | number | .1570 in | 3.988 | 0.0 thou |
| #21 | number | .1590 in | 4.039 | 2.0 thou |
| #20 | number | .1610 in | 4.089 | 4.0 thou |
| #19 | number | .1660 in | 4.216 | 9.0 thou |
| #18 | number | .1695 in | 4.305 | 12.5 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.