Dimensional and assembly data for M6 Flat Plain Washer to GB/T 95 / ISO 7091. Includes head size and width across flats, clearance-hole and tapping-drill diameters, tightening torque per property class, and the sizes to step up or down to when the joint requires it.
M6 Dimensional Row (GB/T 95 / ISO 7091)
| For bolt size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness t (mm) | Reference standard |
|---|---|---|---|---|
| M6 | 6.4 | 12.0 | 1.6 | ISO 7089 / GB/T 97.1 |
Spanner & Drive for M6 Flat Plain Washer — GB/T 95 / ISO 7091 (Series 079)
Drive geometry for M6 Flat Plain Washer — GB/T 95 / ISO 7091 (Series 079) is given by the row above; match the tool to the listed values.
Common Applications for M6 Flat Plain Washer — GB/T 95 / ISO 7091 (Series 079)
M6 Flat Plain Washer — GB/T 95 / ISO 7091 (Series 079) are commonly specified for general-purpose load-spreading and locking under machine bolts.
Mating Parts for M6
A M6 flat washer pairs with a M6 bolt/screw and matching M6 nut.
When to Step Up or Down from M6
When the joint preload approaches the proof load of M6 class 8.8, step up to M8 class 8.8 (or move to M6 class 10.9). When the joint is over-specified, M5 often saves weight and cost without losing the safety margin.