When you need General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087) in the M8 size, the controlling values come from GB/T 97.1 / ISO 7089. This page lists them in one place — pitch, head geometry, tool size and the matching hole.
M8 Dimensional Row (GB/T 97.1 / ISO 7089)
| For bolt size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness t (mm) | Reference standard |
|---|---|---|---|---|
| M8 | 8.4 | 16.0 | 1.6 | ISO 7089 / GB/T 97.1 |
Spanner & Drive for M8 General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087)
Drive geometry for M8 General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087) is given by the row above; match the tool to the listed values.
Common Applications for M8 General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087)
M8 General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087) are commonly specified for general-purpose load-spreading and locking under machine bolts.
Mating Parts for M8
A M8 flat washer pairs with a M8 bolt/screw and matching M8 nut.
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.