1/64" drill size
A 1/64 in drill is 0.0156 in (0.40 mm). It is the smallest fractional drill on this chart; the nearest metric drill is 0.4 mm.
1/64" 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 |
|---|---|---|---|---|
| 0.35 mm | 0.0138" | −0.047 mm | −0.0018" | Smaller |
| 0.4 mm | 0.0157" | +0.003 mm | +0.0001" | 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 1/64" drill can tap
No thread in the tap tables on this site falls between 55 and 85 % thread with this drill, so it is not a useful tap drill for them. Drills this size are mostly used for clearance, pilot and pin holes.
Fractional drill index
Every size in the series, holes drawn to scale.
Common questions
What size is a 1/64 in drill?
A 1/64 in drill is 0.0156 in, which is 0.40 mm (0.3969 mm exactly).
What is the metric equivalent of a 1/64 in drill?
The nearest metric drill is 0.4 mm, 0.003 mm larger. The other close size is 0.35 mm.
Which number or letter drill is closest to 1/64 in?
#78 (0.0160 in) is the closest, 0.0004 in larger.