# 7/64" drill size

A 7/64 in drill is 0.1094 in (2.78 mm). It sits between 3/32 in and 1/8 in in the fractional series; the nearest metric drill is 2.8 mm.

## 7/64" drill data

- Series: Fractional drill
- Decimal: 0.1094 in
- Metric: 2.78 mm (2.7781 mm exact)
- Nearest metric drill: 2.8 mm (+0.022 mm)
- Nearest number drill: #35 (0.1100 in)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 2.75 mm | 0.1083 | −0.028 mm |
| 2.8 mm | 0.1102 | +0.022 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| 3/32" | Fractional | 0.0938 | 2.38 |
| #36 | Number | 0.1065 | 2.71 |
| 7/64" | Fractional | 0.1094 | 2.78 |
| #35 | Number | 0.1100 | 2.79 |
| 1/8" | Fractional | 0.1250 | 3.17 |
| Letter A | Letter | 0.2340 | 5.94 |

## Threads this drill can tap

| Thread | Standard drill | Thread % with this drill |
|---|---|---|
| #6-32 UNC | #36 | 71 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| #1 screw | 0.0730" | 0.0364" | 0.0182" | – |
| #2 screw | 0.0860" | 0.0234" | 0.0117" | – |
| M2.5 bolt | 2.5 mm | 0.28 mm | 0.14 mm | Close fit (close 2.7, normal 2.9 mm) |
| #3 screw | 0.0990" | 0.0104" | 0.0052" | – |


## FAQ

**What size is a 7/64 in drill?**
A 7/64 in drill is 0.1094 in, which is 2.78 mm (2.7781 mm exactly).

**What is the metric equivalent of a 7/64 in drill?**
The nearest metric drill is 2.8 mm, 0.022 mm larger. The other close size is 2.75 mm.

**What thread can I tap with a 7/64 in drill?**
It leaves about 71 % thread in #6-32 UNC.

**Which number or letter drill is closest to 7/64 in?**
#35 (0.1100 in) is the closest, 0.0006 in larger.

**What does a 7/64 in drill clear?**
It clears a #3 screw with 0.0104" total clearance (0.0052" per side).

Source page: https://machinistcharts.com/drill-size/7-64-inch/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)