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#28 drill bit size
#28 drill = .1405 in = 3.57 mm. Closest metric drill: 3.6 mm.
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| #31 | number | .1200 in | 3.048 | -20.5 thou |
| 1/8 | fraction | .1250 in | 3.175 | -15.5 thou |
| #30 | number | .1285 in | 3.264 | -12.0 thou |
| #29 | number | .1360 in | 3.454 | -4.5 thou |
| #28 | number | .1405 in | 3.569 | 0.0 thou |
| 9/64 | fraction | .1406 in | 3.572 | 0.1 thou |
| #27 | number | .1440 in | 3.658 | 3.5 thou |
| #26 | number | .1470 in | 3.734 | 6.5 thou |
| #25 | number | .1495 in | 3.797 | 9.0 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.