The M4 size of Castellated Hex Nut is dimensioned by GB/T 6180 / ISO 7036. 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.
M4 Dimensional Row (GB/T 6180 / ISO 7036)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e (mm) | Total height m (mm) | Slot width (mm) | Reference standard |
|---|---|---|---|---|---|---|
| M4 | 0.7 | 7.0 | 7.66 | 5.0 | 1.5 | ISO 7036 / GB/T 6180 |
Spanner & Drive for M4 Castellated Hex Nut — GB/T 6180 / ISO 7036 (Series 048)
Drive geometry for M4 Castellated Hex Nut — GB/T 6180 / ISO 7036 (Series 048) is given by the row above; match the tool to the listed values.
Common Applications for M4 Castellated Hex Nut — GB/T 6180 / ISO 7036 (Series 048)
M4 Castellated Hex Nut — GB/T 6180 / ISO 7036 (Series 048) are commonly specified for paired with the same-size screws on PCB hardware, light enclosures and small-scale assemblies.
Installation Tips for M4 Castellated Hex Nut — GB/T 6180 / ISO 7036 (Series 048)
- At M4 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 M4
When the joint preload approaches the proof load of M4 class 8.8, step up to M5 class 8.8 (or move to M4 class 10.9). When the joint is over-specified, M3 often saves weight and cost without losing the safety margin.