# 13/32" drill size

A 13/32 in drill is 0.4062 in (10.32 mm). It sits between 25/64 in and 27/64 in in the fractional series; the nearest metric drill is 10.3 mm.

## 13/32" drill data

- Series: Fractional drill
- Decimal: 0.4062 in
- Metric: 10.32 mm (10.3187 mm exact)
- Nearest metric drill: 10.3 mm (−0.019 mm)
- Nearest letter drill: Letter Y (0.4040 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 10.3 mm | 0.4055 | −0.019 mm |
| 10.4 mm | 0.4094 | +0.081 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| #1 | Number | 0.2280 | 5.79 |
| 25/64" | Fractional | 0.3906 | 9.92 |
| Letter Y | Letter | 0.4040 | 10.26 |
| 13/32" | Fractional | 0.4062 | 10.32 |
| Letter Z | Letter | 0.4130 | 10.49 |
| 27/64" | Fractional | 0.4219 | 10.72 |

## Threads this drill can tap

| Thread | Standard drill | Thread % with this drill |
|---|---|---|
| M12 × 1.75 | 10.2 mm | 74 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| 3/8" bolt | 0.3750" | 0.0312" | 0.0156" | – |
| M10 bolt | 10 mm | 0.32 mm | 0.16 mm | Tighter than close fit (10.5 mm) |


## FAQ

**What size is a 13/32 in drill?**
A 13/32 in drill is 0.4062 in, which is 10.32 mm (10.3187 mm exactly).

**What is the metric equivalent of a 13/32 in drill?**
The nearest metric drill is 10.3 mm, 0.019 mm smaller. The other close size is 10.4 mm.

**What thread can I tap with a 13/32 in drill?**
It leaves about 74 % thread in M12 × 1.75.

**Which number or letter drill is closest to 13/32 in?**
Letter Y (0.4040 in) is the closest, 0.0022 in smaller.

**What does a 13/32 in drill clear?**
It clears a M10 bolt with 0.32 mm total clearance (0.16 mm per side); for metric bolts: tighter than close fit.

Source page: https://machinistcharts.com/drill-size/13-32-inch/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)