# 11/32" drill size

A 11/32 in drill is 0.3438 in (8.73 mm). It sits between 21/64 in and 23/64 in in the fractional series; the nearest metric drill is 8.7 mm.

## 11/32" drill data

- Series: Fractional drill
- Decimal: 0.3438 in
- Metric: 8.73 mm (8.7312 mm exact)
- Nearest metric drill: 8.7 mm (−0.031 mm)
- Nearest letter drill: Letter S (0.3480 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 8.7 mm | 0.3425 | −0.031 mm |
| 8.8 mm | 0.3465 | +0.069 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| #1 | Number | 0.2280 | 5.79 |
| 21/64" | Fractional | 0.3281 | 8.33 |
| Letter R | Letter | 0.3390 | 8.61 |
| 11/32" | Fractional | 0.3438 | 8.73 |
| Letter S | Letter | 0.3480 | 8.84 |
| 23/64" | Fractional | 0.3594 | 9.13 |

## Threads this drill can tap

| Thread | Standard drill | Thread % with this drill |
|---|---|---|
| M10 × 1.25 | 8.8 mm | 78 |
| M10 × 1.5 | 8.5 mm | 65 |
| 3/8-24 UNF | Q | 58 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| 5/16" bolt | 0.3125" | 0.0312" | 0.0156" | – |
| M8 bolt | 8 mm | 0.73 mm | 0.37 mm | Close fit (close 8.4, normal 9 mm) |


## FAQ

**What size is a 11/32 in drill?**
A 11/32 in drill is 0.3438 in, which is 8.73 mm (8.7312 mm exactly).

**What is the metric equivalent of a 11/32 in drill?**
The nearest metric drill is 8.7 mm, 0.031 mm smaller. The other close size is 8.8 mm.

**What thread can I tap with a 11/32 in drill?**
It leaves about 78 % thread in M10 × 1.25 and 65 % in M10 × 1.5.

**Which number or letter drill is closest to 11/32 in?**
Letter S (0.3480 in) is the closest, 0.0042 in larger.

**What does a 11/32 in drill clear?**
It clears a M8 bolt with 0.73 mm total clearance (0.37 mm per side); for metric bolts: close fit.

Source page: https://machinistcharts.com/drill-size/11-32-inch/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)