On the bench specifying M12 Square Nut, Metric — GB/T 39 / ISO 4034 (Series 076)? This page gives the controlling dimensions for the M12 size of Square Nut, Metric — GB/T 39 / ISO 4034 (Series 076) (to GB/T 39 / ISO 4034).
M12 Dimensional Row (GB/T 39 / ISO 4034)
| Size | Pitch (mm) | Width across flats s (mm) | Nut height m (mm) | Reference standard |
|---|---|---|---|---|
| M12 | 1.75 | 19.0 | 7.0 | GB/T 39 / DIN 562 |
Spanner & Drive for M12 Square Nut, Metric — GB/T 39 / ISO 4034 (Series 076)
Drive geometry for M12 Square Nut, Metric — GB/T 39 / ISO 4034 (Series 076) is given by the row above; match the tool to the listed values.
Common Applications for M12 Square Nut, Metric — GB/T 39 / ISO 4034 (Series 076)
M12 Square Nut, Metric — GB/T 39 / ISO 4034 (Series 076) 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.