# #54 drill size

A #54 drill is 0.0550 in (1.40 mm). It sits between #55 and #53 in the number series; the nearest metric drill is 1.4 mm.

## #54 drill data

- Series: Number drill
- Decimal: 0.0550 in
- Metric: 1.40 mm (1.3970 mm exact)
- Nearest metric drill: 1.4 mm (+0.003 mm)
- Nearest fractional: 1/16" (0.0625 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 1.35 mm | 0.0531 | −0.047 mm |
| 1.4 mm | 0.0551 | +0.003 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| 3/64" | Fractional | 0.0469 | 1.19 |
| #55 | Number | 0.0520 | 1.32 |
| #54 | Number | 0.0550 | 1.40 |
| #53 | Number | 0.0595 | 1.51 |
| 1/16" | Fractional | 0.0625 | 1.59 |
| Letter A | Letter | 0.2340 | 5.94 |


## FAQ

**What size is a #54 drill?**
A #54 drill is 0.0550 in, which is 1.40 mm (1.3970 mm exactly).

**What is the metric equivalent of a #54 drill?**
The nearest metric drill is 1.4 mm, 0.003 mm larger. The other close size is 1.35 mm.

**Which fractional drill is closest to #54?**
1/16 in (0.0625 in) is the closest, 0.0075 in larger.

Source page: https://machinistcharts.com/drill-size/number-54/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)