Dimensional and assembly data for M16 General Flat Washer to GB/T 97.1 / ISO 7089. 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.
M16 Dimensional Row (GB/T 97.1 / ISO 7089)
| For bolt size | Inner diameter d1 (mm) | Outer diameter d2 (mm) | Thickness t (mm) | Reference standard |
|---|---|---|---|---|
| M16 | 17.0 | 30.0 | 3.0 | ISO 7089 / GB/T 97.1 |
Spanner & Drive for M16 General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087)
Drive geometry for M16 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 M16 General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087)
M16 General Flat Washer — GB/T 97.1 / ISO 7089 (Series 087) are commonly specified for medium-duty structural joints.
Mating Parts for M16
A M16 flat washer pairs with a M16 bolt/screw and matching M16 nut.
When to Step Up or Down from M16
When the joint preload approaches the proof load of M16 class 8.8, step up to M20 class 8.8 (or move to M16 class 10.9). When the joint is over-specified, M12 often saves weight and cost without losing the safety margin.