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#61 drill bit size
#61 drill = .0390 in = 0.99 mm. Closest metric drill: 1 mm.
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| #65 | number | .0350 in | 0.889 | -4.0 thou |
| #64 | number | .0360 in | 0.914 | -3.0 thou |
| #63 | number | .0370 in | 0.940 | -2.0 thou |
| #62 | number | .0380 in | 0.965 | -1.0 thou |
| #61 | number | .0390 in | 0.991 | 0.0 thou |
| #60 | number | .0400 in | 1.016 | 1.0 thou |
| #59 | number | .0410 in | 1.041 | 2.0 thou |
| #58 | number | .0420 in | 1.067 | 3.0 thou |
| #57 | number | .0430 in | 1.092 | 4.0 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.