When you need Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053) in the M5 size, the controlling values come from GB/T 6181 / ISO 4035. This page lists them in one place — pitch, head geometry, tool size and the matching hole.
M5 Dimensional Row (GB/T 6181 / ISO 4035)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e (mm) | Total height m (mm) | Slot width (mm) | Reference standard |
|---|---|---|---|---|---|---|
| M5 | 0.8 | 8.0 | 8.79 | 6.7 | 1.8 | ISO 7036 / GB/T 6180 |
Spanner & Drive for M5 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053)
Drive geometry for M5 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053) is given by the row above; match the tool to the listed values.
Common Applications for M5 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053)
M5 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053) are commonly specified for paired with the same-size screws on PCB hardware, light enclosures and small-scale assemblies.
Installation Tips for M5 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053)
- 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.