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#16 drill bit size
#16 drill = .1770 in = 4.50 mm. Closest metric drill: 4.5 mm.
Taps that use a #16 drill
- #12-24 UNC: about 72% thread
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| #19 | number | .1660 in | 4.216 | -11.0 thou |
| #18 | number | .1695 in | 4.305 | -7.5 thou |
| 11/64 | fraction | .1719 in | 4.366 | -5.1 thou |
| #17 | number | .1730 in | 4.394 | -4.0 thou |
| #16 | number | .1770 in | 4.496 | 0.0 thou |
| #15 | number | .1800 in | 4.572 | 3.0 thou |
| #14 | number | .1820 in | 4.623 | 5.0 thou |
| #13 | number | .1850 in | 4.699 | 8.0 thou |
| 3/16 | fraction | .1875 in | 4.762 | 10.5 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.