# Nyloc lock nuts, M2.5–M8 (DIN 985)

> How thick is an M3 nyloc nut?

- Category: Hardware › Fasteners
- Kind: Hardware
- Basis: DIN 985 / ISO 10511 (thin type is lower; values are the common DIN 985)
- Page: https://xemstudio.com/objects/nyloc-nuts-metric/ · JSON: https://xemstudio.com/api/geometry?object=nyloc-nuts-metric · Plain text: https://xemstudio.com/objects/nyloc-nuts-metric/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Notes

- Same across-flats as a plain nut, taller because of the nylon collar: M3 is 4.0 mm vs 2.4 mm plain. Size a nut pocket to the full height.
- Not reusable more than a few times; don't rely on them on a printed part that will be opened often.

## Sizes

| thread | width_af_mm | height_mm |
|---|---|---|
| M2.5 | 5.0 | 2.9 |
| M3 | 5.5 | 4.0 |
| M4 | 7.0 | 5.0 |
| M5 | 8.0 | 5.0 |
| M6 | 10.0 | 6.0 |
| M8 | 13.0 | 8.0 |

## Where the files are

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

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

Index: https://xemstudio.com/files/hardware/nyloc-nuts-metric/index.json

- nyloc-m2.5: [STEP](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m2.5.step) · [STL](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m2.5.stl) — DIN 985 M2.5, 5.0 AF × 2.9 high
- nyloc-m3: [STEP](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m3.step) · [STL](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m3.stl) — DIN 985 M3, 5.5 AF × 4.0 high
- nyloc-m4: [STEP](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m4.step) · [STL](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m4.stl) — DIN 985 M4, 7.0 AF × 5.0 high
- nyloc-m5: [STEP](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m5.step) · [STL](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m5.stl) — DIN 985 M5, 8.0 AF × 5.0 high
- nyloc-m6: [STEP](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m6.step) · [STL](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m6.stl) — DIN 985 M6, 10.0 AF × 6.0 high
- nyloc-m8: [STEP](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m8.step) · [STL](https://xemstudio.com/files/hardware/nyloc-nuts-metric/nyloc-m8.stl) — DIN 985 M8, 13.0 AF × 8.0 high

## Questions

**How tall is an M3 nyloc nut?**

4.0 mm (5.5 mm across flats); an M4 is 5.0 mm (7 AF), M5 5.0 mm (8 AF), M6 6.0 mm (10 AF), M8 8.0 mm (13 AF).

**Can I print a pocket for a nyloc nut?**

Yes: AF + 0.3 mm, depth = nut height + 0.3 mm. The nylon collar must face away from the screw entry.

## Fits with

- [Hex nuts, M2–M8 (ISO 4032)](https://xemstudio.com/objects/hex-nuts-metric/)
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)
- [Flat washers, M2–M8 (ISO 7089)](https://xemstudio.com/objects/flat-washers-metric/)