# 15/16" drill size

A 15/16 in drill is 0.9375 in (23.81 mm). It sits between 59/64 in and 61/64 in in the fractional series; the nearest metric drill is 23.8 mm.

## 15/16" drill data

- Series: Fractional drill
- Decimal: 0.9375 in
- Metric: 23.81 mm (23.8125 mm exact)
- Nearest metric drill: 23.8 mm (−0.012 mm)

## Nearest metric drills

| Metric drill | Inch | Difference |
|---|---|---|
| 23.8 mm | 0.9370 | −0.012 mm |
| 23.9 mm | 0.9409 | +0.087 mm |

## Nearby inch drills

| Drill | Series | Inch | mm |
|---|---|---|---|
| #1 | Number | 0.2280 | 5.79 |
| Letter Z | Letter | 0.4130 | 10.49 |
| 59/64" | Fractional | 0.9219 | 23.42 |
| 15/16" | Fractional | 0.9375 | 23.81 |
| 61/64" | Fractional | 0.9531 | 24.21 |

## Threads this drill can tap

| Thread | Standard drill | Thread % with this drill |
|---|---|---|
| M27 × 3 | 24 mm | 82 |
| 1-12 UNF | 59/64 | 58 |

## Clearance

| Fastener | Diameter | Clearance | Per side | ISO 273 |
|---|---|---|---|---|
| M20 bolt | 20 mm | 3.81 mm | 1.91 mm | Normal fit (normal 22, loose 24 mm) |
| M22 bolt | 22 mm | 1.81 mm | 0.91 mm | Close fit (close 23, normal 24 mm) |
| 7/8" bolt | 0.8750" | 0.0625" | 0.0312" | – |


## FAQ

**What size is a 15/16 in drill?**
A 15/16 in drill is 0.9375 in, which is 23.81 mm (23.8125 mm exactly).

**What is the metric equivalent of a 15/16 in drill?**
The nearest metric drill is 23.8 mm, 0.012 mm smaller. The other close size is 23.9 mm.

**What thread can I tap with a 15/16 in drill?**
It leaves about 82 % thread in M27 × 3 and 58 % in 1-12 UNF.

**What does a 15/16 in drill clear?**
It clears a 7/8" bolt with 0.0625" total clearance (0.0312" per side).

Source page: https://machinistcharts.com/drill-size/15-16-inch/
Updated: 2026-10-06
Publisher: MachinistCharts (https://machinistcharts.com)