On the bench specifying M3 Square Nut — GB/T 39 / ISO 4034 (Series 075)? This page gives the controlling dimensions for the M3 size of Square Nut — GB/T 39 / ISO 4034 (Series 075) (to GB/T 39 / ISO 4034).
M3 Dimensional Row (GB/T 39 / ISO 4034)
| Size | Pitch (mm) | Width across flats s (mm) | Nut height m (mm) | Reference standard |
|---|---|---|---|---|
| M3 | 0.5 | 5.5 | 1.8 | GB/T 39 / DIN 562 |
Spanner & Drive for M3 Square Nut — GB/T 39 / ISO 4034 (Series 075)
Drive geometry for M3 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 M3 Square Nut — GB/T 39 / ISO 4034 (Series 075)
M3 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 M3 Square Nut — GB/T 39 / ISO 4034 (Series 075)
- At M3 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 M3
Pair M3 with the matching M3 bolt or screw, plus a M3 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M3
When the joint preload approaches the proof load of M3 class 8.8, step up to M4 class 8.8 (or move to M3 class 10.9). When the joint is over-specified, M2 often saves weight and cost without losing the safety margin.