For Hex Slotted Castle Nut (Type 2) — GB/T 6180 / ISO 7036 (Series 050), the M3 thread sits in the small-to-medium range of the catalog and is one of the most-asked hex slotted castle nut (type 2) — gb/t 6180 / iso 7036 (series 050) in this family. The dimensional and assembly data follow.
M3 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 |
|---|---|---|---|---|---|---|
| M3 | 0.5 | 5.5 | 6.01 | 4.0 | 1.2 | ISO 7036 / GB/T 6180 |
Spanner & Drive for M3 Hex Slotted Castle Nut (Type 2) — GB/T 6180 / ISO 7036 (Series 050)
Drive geometry for M3 Hex Slotted Castle Nut (Type 2) — GB/T 6180 / ISO 7036 (Series 050) is given by the row above; match the tool to the listed values.
Common Applications for M3 Hex Slotted Castle Nut (Type 2) — GB/T 6180 / ISO 7036 (Series 050)
M3 Hex Slotted Castle Nut (Type 2) — GB/T 6180 / ISO 7036 (Series 050) are commonly specified for paired with the same-size screws on PCB hardware, light enclosures and small-scale assemblies.
Installation Tips for M3 Hex Slotted Castle Nut (Type 2) — GB/T 6180 / ISO 7036 (Series 050)
- 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.