# #11 drill size

A #11 drill is 0.1910 in (4.85 mm). It sits between #12 and #10 in the number series; the nearest metric drill is 4.9 mm.

## #11 drill data

- Series: Number drill
- Decimal: 0.1910 in
- Metric: 4.85 mm (4.8514 mm exact)
- Nearest metric drill: 4.9 mm (+0.049 mm)
- Nearest fractional: 3/16" (0.1875 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 4.8 mm | 0.1890 | −0.051 mm |
| 4.9 mm | 0.1929 | +0.049 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| 3/16" | Fractional | 0.1875 | 4.76 |
| #12 | Number | 0.1890 | 4.80 |
| #11 | Number | 0.1910 | 4.85 |
| #10 | Number | 0.1935 | 4.91 |
| 13/64" | Fractional | 0.2031 | 5.16 |
| Letter A | Letter | 0.2340 | 5.94 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| #6 screw | 0.1380" | 0.0530" | 0.0265" | – |
| #8 screw | 0.1640" | 0.0270" | 0.0135" | – |
| #10 screw | 0.1900" | 0.0010" | 0.0005" | – |


## FAQ

**What size is a #11 drill?**
A #11 drill is 0.1910 in, which is 4.85 mm (4.8514 mm exactly).

**What is the metric equivalent of a #11 drill?**
The nearest metric drill is 4.9 mm, 0.049 mm larger. The other close size is 4.8 mm.

**Which fractional drill is closest to #11?**
3/16 in (0.1875 in) is the closest, 0.0035 in smaller.

**What does a #11 drill clear?**
It clears a #10 screw with 0.0010" total clearance (0.0005" per side).

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