Selecting Square Nut — GB/T 39 / ISO 4034 (Series 075), M8, in GB/T 39 / ISO 4034: 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.
M8 Dimensional Row (GB/T 39 / ISO 4034)
| Size | Pitch (mm) | Width across flats s (mm) | Nut height m (mm) | Reference standard |
|---|---|---|---|---|
| M8 | 1.25 | 13.0 | 4.8 | GB/T 39 / DIN 562 |
Spanner & Drive for M8 Square Nut — GB/T 39 / ISO 4034 (Series 075)
Drive geometry for M8 Square Nut — GB/T 39 / ISO 4034 (Series 075) is given by the row above; match the tool to the listed values.
Common Applications for M8 Square Nut — GB/T 39 / ISO 4034 (Series 075)
M8 Square Nut — GB/T 39 / ISO 4034 (Series 075) are commonly specified for general-purpose joints in machinery, fixturing and equipment frames.
Mating Parts for M8
Pair M8 with the matching M8 bolt or screw, plus a M8 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M8
When the joint preload approaches the proof load of M8 class 8.8, step up to M10 class 8.8 (or move to M8 class 10.9). When the joint is over-specified, M6 often saves weight and cost without losing the safety margin.