# 3/4" drill size

A 3/4 in drill is 0.7500 in (19.05 mm). It sits between 47/64 in and 49/64 in in the fractional series; the nearest metric drills are 19.0 and 19.1 mm, equally close.

## 3/4" drill data

- Series: Fractional drill
- Decimal: 0.7500 in
- Metric: 19.05 mm (19.0500 mm exact)
- Nearest metric drill: 19.0 mm (−0.050 mm)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 19.0 mm | 0.7480 | −0.050 mm |
| 19.1 mm | 0.7520 | +0.050 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| #1 | Number | 0.2280 | 5.79 |
| Letter Z | Letter | 0.4130 | 10.49 |
| 47/64" | Fractional | 0.7344 | 18.65 |
| 3/4" | Fractional | 0.7500 | 19.05 |
| 49/64" | Fractional | 0.7656 | 19.45 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| M18 bolt | 18 mm | 1.05 mm | 0.52 mm | Close fit (close 19, normal 20 mm) |


## FAQ

**What size is a 3/4 in drill?**
A 3/4 in drill is 0.7500 in, which is 19.05 mm (19.0500 mm exactly).

**What is the metric equivalent of a 3/4 in drill?**
The nearest metric drill is 19.0 mm, 0.050 mm smaller. The other close size is 19.1 mm.

**What does a 3/4 in drill clear?**
It clears a M18 bolt with 1.05 mm total clearance (0.52 mm per side); for metric bolts: close fit.

Source page: https://machinistcharts.com/drill-size/3-4-inch/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)