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#51 drill bit size
#51 drill = .0670 in = 1.70 mm. Closest metric drill: 1.7 mm.
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| #54 | number | .0550 in | 1.397 | -12.0 thou |
| #53 | number | .0595 in | 1.511 | -7.5 thou |
| 1/16 | fraction | .0625 in | 1.587 | -4.5 thou |
| #52 | number | .0635 in | 1.613 | -3.5 thou |
| #51 | number | .0670 in | 1.702 | 0.0 thou |
| #50 | number | .0700 in | 1.778 | 3.0 thou |
| #49 | number | .0730 in | 1.854 | 6.0 thou |
| #48 | number | .0760 in | 1.930 | 9.0 thou |
| 5/64 | fraction | .0781 in | 1.984 | 11.1 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.