A plain washer — gb/t 858 (series 071 in M8: this guide pulls the row from the standard, adds the assembly numbers an engineer actually uses, and links you straight to a quote.
M8 Dimensional Row (GB/T 858)
| 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 Plain Washer — GB/T 858 (Series 071)
Drive geometry for M8 Plain Washer — GB/T 858 (Series 071) is given by the row above; match the tool to the listed values.
Common Applications for M8 Plain Washer — GB/T 858 (Series 071)
M8 Plain Washer — GB/T 858 (Series 071) 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.