# #72 drill size

A #72 drill is 0.0250 in (0.64 mm). It sits between #73 and #71 in the number series; the nearest metric drill is 0.65 mm.

## #72 drill data

- Series: Number drill
- Decimal: 0.0250 in
- Metric: 0.64 mm (0.6350 mm exact)
- Nearest metric drill: 0.65 mm (+0.015 mm)
- Nearest fractional: 1/32" (0.0312 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 0.6 mm | 0.0236 | −0.035 mm |
| 0.65 mm | 0.0256 | +0.015 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| 1/64" | Fractional | 0.0156 | 0.40 |
| #73 | Number | 0.0240 | 0.61 |
| #72 | Number | 0.0250 | 0.64 |
| #71 | Number | 0.0260 | 0.66 |
| 1/32" | Fractional | 0.0312 | 0.79 |
| Letter A | Letter | 0.2340 | 5.94 |


## FAQ

**What size is a #72 drill?**
A #72 drill is 0.0250 in, which is 0.64 mm (0.6350 mm exactly).

**What is the metric equivalent of a #72 drill?**
The nearest metric drill is 0.65 mm, 0.015 mm larger. The other close size is 0.6 mm.

**Which fractional drill is closest to #72?**
1/32 in (0.0312 in) is the closest, 0.0062 in larger.

Source page: https://machinistcharts.com/drill-size/number-72/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)