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#4 drill bit size
#4 drill = .2090 in = 5.31 mm. Closest metric drill: 5.3 mm.
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| #7 | number | .2010 in | 5.105 | -8.0 thou |
| 13/64 | fraction | .2031 in | 5.159 | -5.9 thou |
| #6 | number | .2040 in | 5.182 | -5.0 thou |
| #5 | number | .2055 in | 5.220 | -3.5 thou |
| #4 | number | .2090 in | 5.309 | 0.0 thou |
| #3 | number | .2130 in | 5.410 | 4.0 thou |
| 7/32 | fraction | .2188 in | 5.556 | 9.8 thou |
| #2 | number | .2210 in | 5.613 | 12.0 thou |
| #1 | number | .2280 in | 5.791 | 19.0 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.