Nyloc lock nuts, M2.5–M8 (DIN 985) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/nyloc-nuts-metric/  (CC BY 4.0)
Basis: DIN 985 / ISO 10511 (thin type is lower; values are the common DIN 985)
Catalog version: 2026-10-20

Sizes: see table below
- 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.

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

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- McMaster-Carr: Nylon-insert locknuts (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 license at link] — https://www.mcmaster.com/products/nylon-insert-locknuts/
- Wikipedia: Nyloc nut — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Nyloc_nut

Free files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/nyloc-nuts-metric/index.json
API: https://xemstudio.com/api/geometry?object=nyloc-nuts-metric