# #79 drill size

A #79 drill is 0.0145 in (0.37 mm). It sits between #80 and #78 in the number series; the nearest metric drill is 0.35 mm.

## #79 drill data

- Series: Number drill
- Decimal: 0.0145 in
- Metric: 0.37 mm (0.3683 mm exact)
- Nearest metric drill: 0.35 mm (−0.018 mm)
- Nearest fractional: 1/64" (0.0156 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 0.35 mm | 0.0138 | −0.018 mm |
| 0.4 mm | 0.0157 | +0.032 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| #80 | Number | 0.0135 | 0.34 |
| #79 | Number | 0.0145 | 0.37 |
| 1/64" | Fractional | 0.0156 | 0.40 |
| #78 | Number | 0.0160 | 0.41 |
| Letter A | Letter | 0.2340 | 5.94 |


## FAQ

**What size is a #79 drill?**
A #79 drill is 0.0145 in, which is 0.37 mm (0.3683 mm exactly).

**What is the metric equivalent of a #79 drill?**
The nearest metric drill is 0.35 mm, 0.018 mm smaller. The other close size is 0.4 mm.

**Which fractional drill is closest to #79?**
1/64 in (0.0156 in) is the closest, 0.0011 in larger.

Source page: https://machinistcharts.com/drill-size/number-79/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)