---
title: "M10×1 tap drill 9 mm, clearance 10.5 mm"
description: "M10×1: tap drill 9 mm, clearance hole 10.5 mm, 16 mm hex. Full thread dimensions, how to identify it, and torque."
url: https://atoneplace.net/fastener/m10-1/
site: "At One Place"
---

# M10×1 thread

**M10×1 tap drill: 9 mm**

Clearance hole 10.5 mm · 16 mm hex

M10×1 is a fine metric thread with a 10 mm (0.394") major diameter and 1 mm pitch. Tap it with a 9 mm drill; drill 10.5 mm to pass a bolt through.

## The numbers

- **Designation:** M10×1
- **Major diameter:** 10 mm / 0.394"
- **Minor diameter:** 8.917 mm
- **Pitch:** 1 mm pitch
- **Tap drill (75% thread):** 9 mm — 9 mm
- **Clearance hole (close fit):** 10.5 mm / 0.413"
- **Hex across flats:** 16 mm

## How to measure what you have

1. Measure across the thread crests with calipers. A used M10×1 reads a little under 10 mm — the crests are truncated by the standard, then worn and plated, so anything from about 9.6 mm up is consistent with this size.
2. Measure the pitch: put a rule against the threads and count the distance over ten crests, then divide by ten. This one should give 1 mm.
3. A thread pitch gauge settles it in seconds and costs very little. Guessing between a coarse and a fine thread of the same diameter is the usual way a thread gets stripped.

## Tightening torque

**Typical torque: 46–62 N·m**

33.9–45.7 lb·ft

> Plain steel property class 8.8 or SAE grade 5, dry threads, tightened to about 65% of yield. Lubricated threads reach the same preload at 20-30% less torque. Where the manufacturer publishes a figure — spark plugs, wheel nuts, cylinder heads — use theirs.

## Where this size turns up

- Bicycle rear derailleur hanger threads
- Bicycle disc brake adaptor bolts on some frames
- Fine-pitch adjusters and jam nuts

## Other threads at this diameter

*Same diameter, different pitch. Forcing the wrong one strips the thread in a turn or two.*

| Thread | Pitch | Tap drill | Clearance |
| --- | --- | --- | --- |
| M10×1.5 | 1.5 mm | 8.5 mm | 10.5 mm |
| M10×1.25 | 1.25 mm | 8.8 mm | 10.5 mm |

## Common questions

### What size drill for an M10×1 tap?

9 mm (9 mm), which gives about 75% thread engagement.

### What clearance hole for M10×1?

10.5 mm for a close fit — enough to pass the bolt without slop.

### What spanner fits M10×1?

16 mm across the flats on a standard hex head.

## Related pages

- [M10×1.5](https://atoneplace.net/fastener/m10-1-5/)
- [M10×1.25](https://atoneplace.net/fastener/m10-1-25/)
- [M8×1.25](https://atoneplace.net/fastener/m8-1-25/)
- [M12×1.75](https://atoneplace.net/fastener/m12-1-75/)
- [M8×1](https://atoneplace.net/fastener/m8-1/)
- [M8×0.75](https://atoneplace.net/fastener/m8-0-75/)
- [M12×1.5](https://atoneplace.net/fastener/m12-1-5/)
- [M12×1.25](https://atoneplace.net/fastener/m12-1-25/)
- [M12×1](https://atoneplace.net/fastener/m12-1/)
- [M6×1](https://atoneplace.net/fastener/m6-1/)
- [M14×2](https://atoneplace.net/fastener/m14-2/)
- [M6×0.75](https://atoneplace.net/fastener/m6-0-75/)

## Sources

- Official vendor product documentation — At One Place (/about/)
- Typical range compiled from manufacturer specifications — At One Place (/about/)