When you need Cap (Acorn) Nuts in the M5 size, the controlling values come from DIN 1587. This page lists them in one place — pitch, head geometry, tool size and the matching hole.
M5 Dimensional Row (DIN 1587)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e min (mm) | Total height m (mm) | Dome diameter (mm) | Reference standard | Notes |
|---|---|---|---|---|---|---|---|
| M5 | 0.8 | 8.0 | 8.79 | 10.0 | 8.0 | DIN 1587 | Closed-end domed cap nut, decorative / protective |
Spanner & Drive for M5 Cap (Acorn) Nuts
Drive geometry for M5 Cap (Acorn) Nuts is given by the row above; match the tool to the listed values.
Common Applications for M5 Cap (Acorn) Nuts
M5 Cap (Acorn) Nuts are commonly specified for paired with the same-size screws on PCB hardware, light enclosures and small-scale assemblies.
Installation Tips for M5 Cap (Acorn) Nuts
- At M5 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
Mating Parts for M5
Pair M5 with the matching M5 bolt or screw, plus a M5 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M5
When the joint preload approaches the proof load of M5 class 8.8, step up to M6 class 8.8 (or move to M5 class 10.9). When the joint is over-specified, M4 often saves weight and cost without losing the safety margin.