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#13 drill bit size
#13 drill = .1850 in = 4.70 mm. Closest metric drill: 4.7 mm.
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| #17 | number | .1730 in | 4.394 | -12.0 thou |
| #16 | number | .1770 in | 4.496 | -8.0 thou |
| #15 | number | .1800 in | 4.572 | -5.0 thou |
| #14 | number | .1820 in | 4.623 | -3.0 thou |
| #13 | number | .1850 in | 4.699 | 0.0 thou |
| 3/16 | fraction | .1875 in | 4.762 | 2.5 thou |
| #12 | number | .1890 in | 4.801 | 4.0 thou |
| #11 | number | .1910 in | 4.851 | 6.0 thou |
| #10 | number | .1935 in | 4.915 | 8.5 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.