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#55 drill bit size
#55 drill = .0520 in = 1.32 mm. Closest metric drill: 1.3 mm.
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| #58 | number | .0420 in | 1.067 | -10.0 thou |
| #57 | number | .0430 in | 1.092 | -9.0 thou |
| #56 | number | .0465 in | 1.181 | -5.5 thou |
| 3/64 | fraction | .0469 in | 1.191 | -5.1 thou |
| #55 | number | .0520 in | 1.321 | 0.0 thou |
| #54 | number | .0550 in | 1.397 | 3.0 thou |
| #53 | number | .0595 in | 1.511 | 7.5 thou |
| 1/16 | fraction | .0625 in | 1.587 | 10.5 thou |
| #52 | number | .0635 in | 1.613 | 11.5 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.