#34 drill size
A #34 drill is 0.1110 in (2.82 mm). It sits between #35 and #33 in the number series; the nearest metric drill is 2.8 mm.
#34 at a glance
Decimal, metric and the nearest sizes in the other series.
Nearest metric drills
Metric drills step by 0.05 mm below 3 mm and by 0.1 mm from 3 mm. Difference is metric minus inch size.
| Metric drill | Inch | Difference | In inches | Hole |
|---|---|---|---|---|
| 2.8 mm | 0.1102" | −0.019 mm | −0.0008" | Smaller |
| 2.85 mm | 0.1122" | +0.031 mm | +0.0012" | Larger |
Nearby inch drills
The next size down and up in each inch series, so you can pick a substitute from the drawer.
Threads a #34 drill can tap
Threads from the tap tables on this site that this drill can tap, with the thread percentage it leaves (55–85 % shown).
Clearance for screws and bolts
Bolts and screws a #34 hole clears, with the diametral clearance and the gap each side. Metric sizes are compared with ISO 273.
| Fastener | Diameter | Clearance | Per side | ISO 273, metric only |
|---|---|---|---|---|
| #1 screw | 0.0730" | 0.0380" | 0.0190" | – |
| #2 screw | 0.0860" | 0.0250" | 0.0125" | – |
| M2.5 bolt | 2.5 mm | 0.32 mm | 0.16 mm | Close fit (close 2.7, normal 2.9 mm) |
| #3 screw | 0.0990" | 0.0120" | 0.0060" | – |
Inch clearance is the drill size minus the basic major diameter. A drilled hole usually cuts slightly oversize.
Number drill index
Every size in the series, holes drawn to scale.
Common questions
What size is a #34 drill?
A #34 drill is 0.1110 in, which is 2.82 mm (2.8194 mm exactly).
What is the metric equivalent of a #34 drill?
The nearest metric drill is 2.8 mm, 0.019 mm smaller. The other close size is 2.85 mm.
What thread can I tap with a #34 drill?
It leaves about 83 % thread in #6-40 UNF and 67 % in #6-32 UNC.
Which fractional drill is closest to #34?
7/64 in (0.1094 in) is the closest, 0.0016 in smaller.
What does a #34 drill clear?
It clears a #3 screw with 0.0120" total clearance (0.0060" per side).