For Flat Plain Washer — GB/T 95 / ISO 7091 (Series 079), the M3 thread sits in the small-to-medium range of the catalog and is one of the most-asked flat plain washer — gb/t 95 / iso 7091 (series 079) in this family. The dimensional and assembly data follow.
M3 Dimensional Row (GB/T 95 / ISO 7091)
| For bolt size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness t (mm) | Reference standard |
|---|---|---|---|---|
| M3 | 3.2 | 7.0 | 0.5 | ISO 7089 / GB/T 97.1 |
Spanner & Drive for M3 Flat Plain Washer — GB/T 95 / ISO 7091 (Series 079)
Drive geometry for M3 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 M3 Flat Plain Washer — GB/T 95 / ISO 7091 (Series 079)
M3 Flat Plain Washer — GB/T 95 / ISO 7091 (Series 079) are commonly specified for small electronics hardware and precision assemblies.
Installation Tips for M3 Flat Plain Washer — GB/T 95 / ISO 7091 (Series 079)
- At M3 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
Mating Parts for M3
A M3 flat washer pairs with a M3 bolt/screw and matching M3 nut.
When to Step Up or Down from M3
When the joint preload approaches the proof load of M3 class 8.8, step up to M4 class 8.8 (or move to M3 class 10.9). When the joint is over-specified, M2 often saves weight and cost without losing the safety margin.