# 5/64" drill size

A 5/64 in drill is 0.0781 in (1.98 mm). It sits between 1/16 in and 3/32 in in the fractional series; the nearest metric drill is 2.0 mm.

## 5/64" drill data

- Series: Fractional drill
- Decimal: 0.0781 in
- Metric: 1.98 mm (1.9844 mm exact)
- Nearest metric drill: 2.0 mm (+0.016 mm)
- Nearest number drill: #47 (0.0785 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 1.95 mm | 0.0768 | −0.034 mm |
| 2.0 mm | 0.0787 | +0.016 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| 1/16" | Fractional | 0.0625 | 1.59 |
| #48 | Number | 0.0760 | 1.93 |
| 5/64" | Fractional | 0.0781 | 1.98 |
| #47 | Number | 0.0785 | 1.99 |
| 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 | 77 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| M1.6 bolt | 1.6 mm | 0.38 mm | 0.19 mm | Normal fit (normal 1.8, loose 2 mm) |
| #1 screw | 0.0730" | 0.0051" | 0.0026" | – |


## FAQ

**What size is a 5/64 in drill?**
A 5/64 in drill is 0.0781 in, which is 1.98 mm (1.9844 mm exactly).

**What is the metric equivalent of a 5/64 in drill?**
The nearest metric drill is 2.0 mm, 0.016 mm larger. The other close size is 1.95 mm.

**What thread can I tap with a 5/64 in drill?**
It leaves about 77 % thread in #3-48 UNC.

**Which number or letter drill is closest to 5/64 in?**
#47 (0.0785 in) is the closest, 0.0004 in larger.

**What does a 5/64 in drill clear?**
It clears a #1 screw with 0.0051" total clearance (0.0026" per side).

Source page: https://machinistcharts.com/drill-size/5-64-inch/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)