# 25/32" drill size

A 25/32 in drill is 0.7812 in (19.84 mm). It sits between 49/64 in and 51/64 in in the fractional series; the nearest metric drill is 19.8 mm.

## 25/32" drill data

- Series: Fractional drill
- Decimal: 0.7812 in
- Metric: 19.84 mm (19.8438 mm exact)
- Nearest metric drill: 19.8 mm (−0.044 mm)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 19.8 mm | 0.7795 | −0.044 mm |
| 19.9 mm | 0.7835 | +0.056 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| #1 | Number | 0.2280 | 5.79 |
| Letter Z | Letter | 0.4130 | 10.49 |
| 49/64" | Fractional | 0.7656 | 19.45 |
| 25/32" | Fractional | 0.7812 | 19.84 |
| 51/64" | Fractional | 0.7969 | 20.24 |

## Threads this drill can tap

| Thread | Standard drill | Thread % with this drill |
|---|---|---|
| M22 × 2.5 | 19.5 mm | 66 |
| 7/8-9 UNC | 49/64 | 65 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| M18 bolt | 18 mm | 1.84 mm | 0.92 mm | Close fit (close 19, normal 20 mm) |
| 3/4" bolt | 0.7500" | 0.0312" | 0.0156" | – |


## FAQ

**What size is a 25/32 in drill?**
A 25/32 in drill is 0.7812 in, which is 19.84 mm (19.8438 mm exactly).

**What is the metric equivalent of a 25/32 in drill?**
The nearest metric drill is 19.8 mm, 0.044 mm smaller. The other close size is 19.9 mm.

**What thread can I tap with a 25/32 in drill?**
It leaves about 66 % thread in M22 × 2.5 and 65 % in 7/8-9 UNC.

**What does a 25/32 in drill clear?**
It clears a 3/4" bolt with 0.0312" total clearance (0.0156" per side).

Source page: https://machinistcharts.com/drill-size/25-32-inch/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)