# #70 drill size

A #70 drill is 0.0280 in (0.71 mm). It sits between #71 and #69 in the number series; the nearest metric drill is 0.7 mm.

## #70 drill data

- Series: Number drill
- Decimal: 0.0280 in
- Metric: 0.71 mm (0.7112 mm exact)
- Nearest metric drill: 0.7 mm (−0.011 mm)
- Nearest fractional: 1/32" (0.0312 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 0.7 mm | 0.0276 | −0.011 mm |
| 0.75 mm | 0.0295 | +0.039 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| 1/64" | Fractional | 0.0156 | 0.40 |
| #71 | Number | 0.0260 | 0.66 |
| #70 | Number | 0.0280 | 0.71 |
| #69 | Number | 0.0292 | 0.74 |
| 1/32" | Fractional | 0.0312 | 0.79 |
| Letter A | Letter | 0.2340 | 5.94 |


## FAQ

**What size is a #70 drill?**
A #70 drill is 0.0280 in, which is 0.71 mm (0.7112 mm exactly).

**What is the metric equivalent of a #70 drill?**
The nearest metric drill is 0.7 mm, 0.011 mm smaller. The other close size is 0.75 mm.

**Which fractional drill is closest to #70?**
1/32 in (0.0312 in) is the closest, 0.0032 in larger.

Source page: https://machinistcharts.com/drill-size/number-70/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)