# Neodymium disc magnets, common sizes

> What pocket size do 6×3 and 10×3 magnets need in a 3D print?

- Category: Hardware › Magnets & seals
- Kind: Hardware
- Basis: standard disc sizes; nominal, N35–N52 share dimensions
- Page: https://xemstudio.com/objects/neodymium-disc-magnets/ · JSON: https://xemstudio.com/api/geometry?object=neodymium-disc-magnets · Plain text: https://xemstudio.com/objects/neodymium-disc-magnets/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Notes

- Common sizes: Ø6 × 3, Ø8 × 3, Ø10 × 3, Ø12 × 3, Ø5 × 2, Ø3 × 1 mm (tolerance about ±0.1 mm).
- Press-fit pocket: diameter + 0.1–0.2 mm, depth = thickness; glue-in: diameter + 0.4 mm. A 0.5 mm floor between magnet and the mating part keeps pull strong and the surface smooth.
- Polarity: mark north on the pair before gluing.

## Sizes

| size | dia_mm | thick_mm | press_fit_hole_mm | glue_hole_mm |
|---|---|---|---|---|
| 3x1 | 3 | 1 | 3.15 | 3.4 |
| 5x2 | 5 | 2 | 5.15 | 5.4 |
| 6x3 | 6 | 3 | 6.15 | 6.4 |
| 8x3 | 8 | 3 | 8.15 | 8.4 |
| 10x3 | 10 | 3 | 10.2 | 10.4 |
| 12x3 | 12 | 3 | 12.2 | 12.4 |

## Where the files are

- McMaster-Carr: [Magnets (free STEP/IGES/STL per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/magnets/) — STEP, IGES, STL, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- Wikipedia: [Neodymium magnet](https://en.wikipedia.org/wiki/Neodymium_magnet) — web — CC BY-SA 4.0 (text)

## Free STEP/STL (6 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/neodymium-disc-magnets/index.json

- magnet-3x1: [STEP](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-3x1.step) · [STL](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-3x1.stl) — disc Ø3 × 1
- magnet-5x2: [STEP](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-5x2.step) · [STL](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-5x2.stl) — disc Ø5 × 2
- magnet-6x3: [STEP](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-6x3.step) · [STL](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-6x3.stl) — disc Ø6 × 3
- magnet-8x3: [STEP](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-8x3.step) · [STL](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-8x3.stl) — disc Ø8 × 3
- magnet-10x3: [STEP](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-10x3.step) · [STL](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-10x3.stl) — disc Ø10 × 3
- magnet-12x3: [STEP](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-12x3.step) · [STL](https://xemstudio.com/files/hardware/neodymium-disc-magnets/magnet-12x3.stl) — disc Ø12 × 3

## Questions

**What hole size for a 6x3 mm magnet in a 3D print?**

Press fit: 6.15 mm diameter, 3 mm deep. Glue-in: 6.4 mm. Leave a 0.5 mm floor between the magnet and the mating face.

**What size pocket for an 8x3 and 10x3 neodymium magnet?**

8×3: 8.15 mm press / 8.4 mm glue. 10×3: 10.15 mm press / 10.4 mm glue. Tolerance on the magnets is about ±0.1 mm.

**How strong is a 6x3 mm N52 magnet?**

Roughly 1 kg pull against mild steel in direct contact; through a 0.5 mm printed floor expect about half that. Pair magnets north-to-south and mark polarity before gluing.

## Fits with

- [Heat-set threaded inserts, M2–M6 (for 3D prints)](https://xemstudio.com/objects/heat-set-inserts/)
- [Dowel pins, 2–6 mm (ISO 2338 / DIN 6325)](https://xemstudio.com/objects/dowel-pins-metric/)