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F drill bit size
F drill = .2570 in = 6.53 mm. Closest metric drill: 6.5 mm.
Taps that use a F drill
- 5/16-18 UNC: about 77% thread
Nearby drill sizes
| Drill | Type | Inch | mm | Difference |
|---|---|---|---|---|
| C | letter | .2420 in | 6.147 | -15.0 thou |
| D | letter | .2460 in | 6.248 | -11.0 thou |
| E | letter | .2500 in | 6.350 | -7.0 thou |
| 1/4 | fraction | .2500 in | 6.350 | -7.0 thou |
| F | letter | .2570 in | 6.528 | 0.0 thou |
| G | letter | .2610 in | 6.629 | 4.0 thou |
| 17/64 | fraction | .2656 in | 6.747 | 8.6 thou |
| H | letter | .2660 in | 6.756 | 9.0 thou |
| I | letter | .2720 in | 6.909 | 15.0 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.