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Neodymium disc magnets, common sizes
What pocket size do 6×3 and 10×3 magnets need in a 3D print? · Hardware · basis: standard disc sizes; nominal, N35–N52 share dimensions
- sizes
- 6 in table
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
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| McMaster-Carr | Magnets (free STEP/IGES/STL per part, for your own design use; no redistribution) | STEP, IGES, STL, PDF | McMaster-Carr site terms: personal design use, no redistribution verify |
| Wikipedia | Neodymium magnet | web | CC BY-SA 4.0 (text) |
Free files
★ Free files 6 parts, generated by Xem Studio from the standard. CC BY 4.0. Threads are plain cylinders at major diameter. index.json
| magnet-3x1 | disc Ø3 × 1 | STEP · STL |
| magnet-5x2 | disc Ø5 × 2 | STEP · STL |
| magnet-6x3 | disc Ø6 × 3 | STEP · STL |
| magnet-8x3 | disc Ø8 × 3 | STEP · STL |
| magnet-10x3 | disc Ø10 × 3 | STEP · STL |
| magnet-12x3 | disc Ø12 × 3 | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=neodymium-disc-magnets
Fits with
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.