# #56 drill size

A #56 drill is 0.0465 in (1.18 mm). It sits between #57 and #55 in the number series; the nearest metric drill is 1.2 mm.

## #56 drill data

- Series: Number drill
- Decimal: 0.0465 in
- Metric: 1.18 mm (1.1811 mm exact)
- Nearest metric drill: 1.2 mm (+0.019 mm)
- Nearest fractional: 3/64" (0.0469 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 1.15 mm | 0.0453 | −0.031 mm |
| 1.2 mm | 0.0472 | +0.019 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| 1/32" | Fractional | 0.0312 | 0.79 |
| #57 | Number | 0.0430 | 1.09 |
| #56 | Number | 0.0465 | 1.18 |
| 3/64" | Fractional | 0.0469 | 1.19 |
| #55 | Number | 0.0520 | 1.32 |
| Letter A | Letter | 0.2340 | 5.94 |

## Threads this drill can tap

| Thread | Standard drill | Thread % with this drill |
|---|---|---|
| #0-80 UNF | 3/64 | 83 |


## FAQ

**What size is a #56 drill?**
A #56 drill is 0.0465 in, which is 1.18 mm (1.1811 mm exactly).

**What is the metric equivalent of a #56 drill?**
The nearest metric drill is 1.2 mm, 0.019 mm larger. The other close size is 1.15 mm.

**What thread can I tap with a #56 drill?**
It leaves about 83 % thread in #0-80 UNF.

**Which fractional drill is closest to #56?**
3/64 in (0.0469 in) is the closest, 0.0004 in larger.

Source page: https://machinistcharts.com/drill-size/number-56/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)