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#8 drill bit size
#8 drill = .1990 in = 5.05 mm. Closest metric drill: 5.1 mm.
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| #12 | number | .1890 in | 4.801 | -10.0 thou |
| #11 | number | .1910 in | 4.851 | -8.0 thou |
| #10 | number | .1935 in | 4.915 | -5.5 thou |
| #9 | number | .1960 in | 4.978 | -3.0 thou |
| #8 | number | .1990 in | 5.055 | 0.0 thou |
| #7 | number | .2010 in | 5.105 | 2.0 thou |
| 13/64 | fraction | .2031 in | 5.159 | 4.1 thou |
| #6 | number | .2040 in | 5.182 | 5.0 thou |
| #5 | number | .2055 in | 5.220 | 6.5 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.