# #47 drill size

A #47 drill is 0.0785 in (1.99 mm). It is the standard tap drill for #3-48 UNC; the nearest metric drill is 2.0 mm.

## #47 drill data

- Series: Number drill
- Decimal: 0.0785 in
- Metric: 1.99 mm (1.9939 mm exact)
- Nearest metric drill: 2.0 mm (+0.006 mm)
- Nearest fractional: 5/64" (0.0781 in)
- Standard tap drill for: #3-48 UNC

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 1.95 mm | 0.0768 | −0.044 mm |
| 2.0 mm | 0.0787 | +0.006 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| #48 | Number | 0.0760 | 1.93 |
| 5/64" | Fractional | 0.0781 | 1.98 |
| #47 | Number | 0.0785 | 1.99 |
| #46 | Number | 0.0810 | 2.06 |
| 3/32" | Fractional | 0.0938 | 2.38 |
| Letter A | Letter | 0.2340 | 5.94 |

## Threads this drill can tap

| Thread | Standard drill | Thread % with this drill |
|---|---|---|
| #3-48 UNC | #47 | 76 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| M1.6 bolt | 1.6 mm | 0.39 mm | 0.20 mm | Normal fit (normal 1.8, loose 2 mm) |
| #1 screw | 0.0730" | 0.0055" | 0.0028" | – |


## FAQ

**What size is a #47 drill?**
A #47 drill is 0.0785 in, which is 1.99 mm (1.9939 mm exactly).

**What is the metric equivalent of a #47 drill?**
The nearest metric drill is 2.0 mm, 0.006 mm larger. The other close size is 1.95 mm.

**What tap uses a #47 drill?**
A #47 drill is the standard tap drill for #3-48 UNC (about 76 % thread).

**Which fractional drill is closest to #47?**
5/64 in (0.0781 in) is the closest, 0.0004 in smaller.

**What does a #47 drill clear?**
It clears a #1 screw with 0.0055" total clearance (0.0028" per side).

Source page: https://machinistcharts.com/drill-size/number-47/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)