Button head socket screws, M2–M8 (ISO 7380) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/button-head-screws-metric/  (CC BY 4.0)
Basis: ISO 7380-1
Catalog version: 2026-10-20

Sizes: see table below
- Low domed head for appearance; no counterbore needed. Head diameter ≈ 1.9 × thread, head height ≈ 0.55 × thread.
- Smaller hex than a cap screw of the same thread (M3 uses 2 mm, M6 uses 4 mm), so torque lower; fine for plastic parts.

thread  head_dia_mm  head_height_mm  hex_key_mm
M2  3.5  1.3  1.3
M2.5  4.7  1.5  1.5
M3  5.7  1.65  2.0
M4  7.6  2.2  2.5
M5  9.5  2.75  3.0
M6  10.5  3.3  4.0
M8  14.0  4.4  5.0

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- McMaster-Carr: Socket head screws (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/socket-head-screws/
- Wikipedia: Screw — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Screw

Free files (CC BY 4.0, Xem Studio; STEP + STL, 35 parts): https://xemstudio.com/files/hardware/button-head-screws-metric/index.json
API: https://xemstudio.com/api/geometry?object=button-head-screws-metric