---
title: "M6×0.75 tap drill 5.2 mm, clearance 6.4 mm"
description: "M6×0.75: tap drill 5.2 mm, clearance hole 6.4 mm, 10 mm hex. Full thread dimensions, how to identify it, and torque."
url: https://atoneplace.net/fastener/m6-0-75/
site: "At One Place"
---

# M6×0.75 thread

**M6×0.75 tap drill: 5.2 mm**

Clearance hole 6.4 mm · 10 mm hex

M6×0.75 is a fine metric thread with a 6 mm (0.236") major diameter and 0.75 mm pitch. Tap it with a 5.2 mm drill; drill 6.4 mm to pass a bolt through.

## The numbers

- **Designation:** M6×0.75
- **Major diameter:** 6 mm / 0.236"
- **Minor diameter:** 5.188 mm
- **Pitch:** 0.75 mm pitch
- **Tap drill (75% thread):** 5.2 mm — 5.2 mm
- **Clearance hole (close fit):** 6.4 mm / 0.252"
- **Hex across flats:** 10 mm

## How to measure what you have

1. Measure across the thread crests with calipers. A used M6×0.75 reads a little under 6 mm — the crests are truncated by the standard, then worn and plated, so anything from about 5.6 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 0.75 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: 9.5–12.5 N·m**

7.0–9.2 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

- Adjusting screws on optical and instrument mounts
- Thin-wall tube and small hydraulic fittings
- Fine-adjustment stops on machine tools

## 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 |
| --- | --- | --- | --- |
| M6×1 | 1 mm | 5 mm | 6.4 mm |

## Common questions

### What size drill for an M6×0.75 tap?

5.2 mm (5.2 mm), which gives about 75% thread engagement.

### What clearance hole for M6×0.75?

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

### What spanner fits M6×0.75?

10 mm across the flats on a standard hex head.

## Related pages

- [M6×1](https://atoneplace.net/fastener/m6-1/)
- [M5×0.8](https://atoneplace.net/fastener/m5-0-8/)
- [M4×0.7](https://atoneplace.net/fastener/m4-0-7/)
- [M8×1.25](https://atoneplace.net/fastener/m8-1-25/)
- [M8×1](https://atoneplace.net/fastener/m8-1/)
- [M8×0.75](https://atoneplace.net/fastener/m8-0-75/)
- [M3.5×0.6](https://atoneplace.net/fastener/m3-5-0-6/)
- [M3×0.5](https://atoneplace.net/fastener/m3-0-5/)
- [M2.5×0.45](https://atoneplace.net/fastener/m2-5-0-45/)
- [M2×0.4](https://atoneplace.net/fastener/m2-0-4/)
- [M10×1.5](https://atoneplace.net/fastener/m10-1-5/)

## Sources

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