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#3 drill bit size
#3 drill = .2130 in = 5.41 mm. Closest metric drill: 5.4 mm.
Taps that use a #3 drill
- 1/4-28 UNF: about 80% thread
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| 13/64 | fraction | .2031 in | 5.159 | -9.9 thou |
| #6 | number | .2040 in | 5.182 | -9.0 thou |
| #5 | number | .2055 in | 5.220 | -7.5 thou |
| #4 | number | .2090 in | 5.309 | -4.0 thou |
| #3 | number | .2130 in | 5.410 | 0.0 thou |
| 7/32 | fraction | .2188 in | 5.556 | 5.8 thou |
| #2 | number | .2210 in | 5.613 | 8.0 thou |
| #1 | number | .2280 in | 5.791 | 15.0 thou |
| A | letter | .2340 in | 5.944 | 21.0 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.