Dimensional and assembly data for M30 Thin Hex Castle Nut to GB/T 6181 / ISO 4035. Includes head size and width across flats, clearance-hole and tapping-drill diameters, tightening torque per property class, and the sizes to step up or down to when the joint requires it.
M30 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 |
|---|---|---|---|---|---|---|
| M30 | 3.5 | 46.0 | 50.85 | 36.0 | 7.0 | ISO 7036 / GB/T 6180 |
Spanner & Drive for M30 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053)
Drive geometry for M30 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 M30 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053)
M30 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053) are commonly specified for structural joints, flange connections and heavy equipment foundations.
Installation Tips for M30 Thin Hex Castle Nut — GB/T 6181 / ISO 4035 (Series 053)
- At M30 the stretch in the bolt becomes the controlling factor — for critical joints, use angle-controlled or stretch-controlled tightening instead of pure torque.
Mating Parts for M30
Pair M30 with the matching M30 bolt or screw, plus a M30 flat washer where required to distribute load on softer materials.