# 7/16" drill size

A 7/16 in drill is 0.4375 in (11.11 mm). It sits between 27/64 in and 29/64 in in the fractional series; the nearest metric drill is 11.1 mm.

## 7/16" drill data

- Series: Fractional drill
- Decimal: 0.4375 in
- Metric: 11.11 mm (11.1125 mm exact)
- Nearest metric drill: 11.1 mm (−0.012 mm)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 11.1 mm | 0.4370 | −0.012 mm |
| 11.2 mm | 0.4409 | +0.088 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| #1 | Number | 0.2280 | 5.79 |
| Letter Z | Letter | 0.4130 | 10.49 |
| 27/64" | Fractional | 0.4219 | 10.72 |
| 7/16" | Fractional | 0.4375 | 11.11 |
| 29/64" | Fractional | 0.4531 | 11.51 |

## Threads this drill can tap

| Thread | Standard drill | Thread % with this drill |
|---|---|---|
| 1/2-13 UNC | 27/64 | 63 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| 3/8" bolt | 0.3750" | 0.0625" | 0.0312" | – |
| M10 bolt | 10 mm | 1.11 mm | 0.56 mm | Normal fit (normal 11, loose 12 mm) |


## FAQ

**What size is a 7/16 in drill?**
A 7/16 in drill is 0.4375 in, which is 11.11 mm (11.1125 mm exactly).

**What is the metric equivalent of a 7/16 in drill?**
The nearest metric drill is 11.1 mm, 0.012 mm smaller. The other close size is 11.2 mm.

**What thread can I tap with a 7/16 in drill?**
It leaves about 63 % thread in 1/2-13 UNC.

**What does a 7/16 in drill clear?**
It clears a M10 bolt with 1.11 mm total clearance (0.56 mm per side); for metric bolts: normal fit.

Source page: https://machinistcharts.com/drill-size/7-16-inch/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)