# 15/32" drill size

A 15/32 in drill is 0.4688 in (11.91 mm). It sits between 29/64 in and 31/64 in in the fractional series; the nearest metric drill is 11.9 mm.

## 15/32" drill data

- Series: Fractional drill
- Decimal: 0.4688 in
- Metric: 11.91 mm (11.9062 mm exact)
- Nearest metric drill: 11.9 mm (−0.006 mm)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 11.9 mm | 0.4685 | −0.006 mm |
| 12.0 mm | 0.4724 | +0.094 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| #1 | Number | 0.2280 | 5.79 |
| Letter Z | Letter | 0.4130 | 10.49 |
| 29/64" | Fractional | 0.4531 | 11.51 |
| 15/32" | Fractional | 0.4688 | 11.91 |
| 31/64" | Fractional | 0.4844 | 12.30 |

## Threads this drill can tap

| Thread | Standard drill | Thread % with this drill |
|---|---|---|
| M14 × 2 | 12 mm | 81 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| M10 bolt | 10 mm | 1.91 mm | 0.95 mm | Normal fit (normal 11, loose 12 mm) |
| 7/16" bolt | 0.4375" | 0.0312" | 0.0156" | – |


## FAQ

**What size is a 15/32 in drill?**
A 15/32 in drill is 0.4688 in, which is 11.91 mm (11.9062 mm exactly).

**What is the metric equivalent of a 15/32 in drill?**
The nearest metric drill is 11.9 mm, 0.006 mm smaller. The other close size is 12.0 mm.

**What thread can I tap with a 15/32 in drill?**
It leaves about 81 % thread in M14 × 2.

**What does a 15/32 in drill clear?**
It clears a 7/16" bolt with 0.0312" total clearance (0.0156" per side).

Source page: https://machinistcharts.com/drill-size/15-32-inch/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)