A #34 drill measures 0.1110 inch (2.819 mm). The closest fractional drill is 7/64" (0.1094") and the closest metric drill is 2.8 mm (0.1102").
What are the #34 drill equivalents?
| Drill | System | Decimal (in) | mm | Difference (in) |
|---|---|---|---|---|
| #34 | number | 0.1110 | 2.819 | 0 |
| 7/64" | fraction | 0.1094 | 2.778 | -0.0016 |
| #35 | number | 0.1100 | 2.794 | -0.0010 |
| 2.8 mm | metric | 0.1102 | 2.800 | -0.0008 |
| #33 | number | 0.1130 | 2.870 | +0.0020 |
Drill sets that include this size
Number and letter sizes come in indexed sets; buy the set rather than single drills.
What speed should a #34 drill run?
| Material | RPM (HSS) | Feed (in/rev) |
|---|---|---|
| 6061-T6 aluminum | 6,882 | 0.0022 |
| 360 free-machining brass | 5,162 | 0.0020 |
| 1018 cold rolled steel | 2,753 | 0.0017 |
| 304 stainless steel | 1,376 | 0.0011 |
Starting points from conservative HSS drilling speeds. Small drills often call for more RPM than a benchtop drill press offers; run at the top speed and feed gently. Use cutting oil in steel and stainless, and clamp the work: never hold it by hand.
Cutting fluid for drilling
Frequently asked questions
What is a #34 drill in inches?
0.1110 inch, which is 2.819 mm. Number drills get smaller as the number rises, so the next number up is a smaller drill. If you do not have this exact size, 2.8 mm is within 0.0008 inch.
What tap uses a #34 drill?
No common UNC or UNF thread uses it as its standard 75% tap drill, but it often serves as an alternative drill for a slightly different percentage of thread, or as a clearance or pilot size. The tap drill chart lists every standard pairing.