On the bench specifying M12 General Flat Washer — GB/T 97.2 / ISO 7090 (Series 088)? This page gives the controlling dimensions for the M12 size of General Flat Washer — GB/T 97.2 / ISO 7090 (Series 088) (to GB/T 97.2 / ISO 7090).
M12 Dimensional Row (GB/T 97.2 / ISO 7090)
| For bolt size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness t (mm) | Reference standard |
|---|---|---|---|---|
| M12 | 13.0 | 24.0 | 2.5 | ISO 7089 / GB/T 97.1 |
Spanner & Drive for M12 General Flat Washer — GB/T 97.2 / ISO 7090 (Series 088)
Drive geometry for M12 General Flat Washer — GB/T 97.2 / ISO 7090 (Series 088) is given by the row above; match the tool to the listed values.
Common Applications for M12 General Flat Washer — GB/T 97.2 / ISO 7090 (Series 088)
M12 General Flat Washer — GB/T 97.2 / ISO 7090 (Series 088) are commonly specified for medium-duty structural joints.
Mating Parts for M12
A M12 flat washer pairs with a M12 bolt/screw and matching M12 nut.
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.