The M5 size of Square Nut is dimensioned by GB/T 39 / ISO 4034. The tables below give the dimensional row from the standard, the drill and spanner sizes that go with it, and the assembly torque per property class. The technical drawing on this page redraws to the exact values selected.
M5 Dimensional Row (GB/T 39 / ISO 4034)
| Size | Pitch (mm) | Width across flats s (mm) | Nut height m (mm) | Reference standard |
|---|---|---|---|---|
| M5 | 0.8 | 8.0 | 2.7 | GB/T 39 / DIN 562 |
Spanner & Drive for M5 Square Nut — GB/T 39 / ISO 4034 (Series 075)
Drive geometry for M5 Square Nut — GB/T 39 / ISO 4034 (Series 075) is given by the row above; match the tool to the listed values.
Common Applications for M5 Square Nut — GB/T 39 / ISO 4034 (Series 075)
M5 Square Nut — GB/T 39 / ISO 4034 (Series 075) are commonly specified for paired with the same-size screws on PCB hardware, light enclosures and small-scale assemblies.
Installation Tips for M5 Square Nut — GB/T 39 / ISO 4034 (Series 075)
- 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.
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.