This page covers M12 General Flat Washer to GB/T 5782 / ISO 4014: the full dimensional row, hole and tool sizes, proof-load data and typical applications. All values are taken from the governing standards (GB/T 5782 / ISO 4014 together with ISO 273, ISO 724 and ISO 898-1 where applicable).
M12 Dimensional Row (GB/T 5782 / ISO 4014)
| 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 5782 / ISO 4014 (Series 008)
Drive geometry for M12 General Flat Washer — GB/T 5782 / ISO 4014 (Series 008) is given by the row above; match the tool to the listed values.
Common Applications for M12 General Flat Washer — GB/T 5782 / ISO 4014 (Series 008)
M12 General Flat Washer — GB/T 5782 / ISO 4014 (Series 008) 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.