Hex nuts, M2–M8 (ISO 4032) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/hex-nuts-metric/  (CC BY 4.0)
Basis: ISO 4032 (DIN 934 matches for M2–M8; they differ at M10 and up)
Catalog version: 2026-10-20

Sizes: see table below
- Width across flats (AF) and thickness per size below. A printed nut trap: AF + 0.2–0.3 mm, thickness + 0.3 mm, and the corner-to-corner dimension is AF × 1.155.
- M3: 5.5 AF, 2.4 thick → print a 5.8 mm hex, 2.8 deep.

thread  width_af_mm  corner_mm  thickness_mm
M2  4  4.6  1.6
M2.5  5  5.8  2
M3  5.5  6.4  2.4
M4  7  8.1  3.2
M5  8  9.2  4.7
M6  10  11.5  5.2
M8  13  15  6.8

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- McMaster-Carr: Hex nuts (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/nuts/hex-nuts/
- Wikipedia: Nut (hardware) — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Nut_(hardware)

Free files (CC BY 4.0, Xem Studio; STEP + STL, 7 parts): https://xemstudio.com/files/hardware/hex-nuts-metric/index.json
API: https://xemstudio.com/api/geometry?object=hex-nuts-metric