# 40 mm axial fan

> What are the mounting dimensions of a 40 mm fan?

- Category: Power & cooling › Fans
- Kind: Standard part
- Basis: industry standard frame
- Page: https://xemstudio.com/objects/40mm-fan/ · JSON: https://xemstudio.com/api/geometry?object=40mm-fan · Plain text: https://xemstudio.com/objects/40mm-fan/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Overall (mm)

| length | width | height |
|---|---|---|
| 40 | 40 | 10 |

Mounting holes: 4 × Ø3.5 mm, pattern 32 x 32 mm, M3

## Notes

- Frame 40 × 40 mm; four holes on a 32 × 32 mm pattern, Ø3.5 mm typical (M3 self-tapping or Ø4.3 for M4 on some).
- Thickness 10 mm (4010) or 20 mm (4020); check airflow direction arrows on the frame.

## Where the files are

- Wikipedia: [Computer fan (dimensions table)](https://en.wikipedia.org/wiki/Computer_fan) — web — CC BY-SA 4.0 (text)

## Questions

**What is the 40 mm fan hole spacing?**

32 × 32 mm, Ø3.5 mm holes (M3 self-tapping). Frame 40 × 40, 10 mm (4010) or 20 mm (4020) thick.

**What screws fit a 40 mm fan?**

M3 × 16–20 for a 10 mm fan through a 3 mm plate, or #6-32 × 3/4 in self-tapping fan screws on 4.3 mm holes.

## Fits with

- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)
- [Raspberry Pi 5](https://xemstudio.com/objects/raspberry-pi-5/)
- [Raspberry Pi 4 Model B](https://xemstudio.com/objects/raspberry-pi-4-b/)
- [120 mm axial fan](https://xemstudio.com/objects/120mm-fan/)