# #57 drill size

A #57 drill is 0.0430 in (1.09 mm). It sits between #58 and #56 in the number series; the nearest metric drill is 1.1 mm.

## #57 drill data

- Series: Number drill
- Decimal: 0.0430 in
- Metric: 1.09 mm (1.0922 mm exact)
- Nearest metric drill: 1.1 mm (+0.008 mm)
- Nearest fractional: 3/64" (0.0469 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 1.05 mm | 0.0413 | −0.042 mm |
| 1.1 mm | 0.0433 | +0.008 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| 1/32" | Fractional | 0.0312 | 0.79 |
| #58 | Number | 0.0420 | 1.07 |
| #57 | Number | 0.0430 | 1.09 |
| #56 | Number | 0.0465 | 1.18 |
| 3/64" | Fractional | 0.0469 | 1.19 |
| Letter A | Letter | 0.2340 | 5.94 |


## FAQ

**What size is a #57 drill?**
A #57 drill is 0.0430 in, which is 1.09 mm (1.0922 mm exactly).

**What is the metric equivalent of a #57 drill?**
The nearest metric drill is 1.1 mm, 0.008 mm larger. The other close size is 1.05 mm.

**Which fractional drill is closest to #57?**
3/64 in (0.0469 in) is the closest, 0.0039 in larger.

Source page: https://machinistcharts.com/drill-size/number-57/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)