Selecting Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053), M12, in GB/T 6181 / ISO 4035: the dimensional row from the standard plus the tools and hole sizes follow. Use them with the technical drawing below — the drawing redraws to the exact size you pick.
M12 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 |
|---|---|---|---|---|---|---|
| M12 | 1.75 | 18.0 | 20.03 | 15.8 | 3.5 | ISO 7036 / GB/T 6180 |
Spanner & Drive for M12 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053)
Drive geometry for M12 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 M12 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053)
M12 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053) are commonly specified for medium-duty structural joints and motor / chassis mounting.
Mating Parts for M12
Pair M12 with the matching M12 bolt or screw, plus a M12 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M12
When the joint preload approaches the proof load of M12 class 8.8, step up to M16 class 8.8 (or move to M12 class 10.9). When the joint is over-specified, M10 often saves weight and cost without losing the safety margin.