Dimensional and assembly data for M8 Spring Lock Washers to ISO 7980 / DIN 127. 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.
M8 Dimensional Row (ISO 7980 / DIN 127)
| For bolt size | Inner diameter d1 min (mm) | Outer diameter d2 max (mm) | Width b (mm) | Thickness s (mm) | Reference standard |
|---|---|---|---|---|---|
| M8 | 8.1 | 14.8 | 5.0 | 2.0 | ISO 7980 / DIN 127 |
Spanner & Drive for M8 Spring Lock Washers
Drive geometry for M8 Spring Lock Washers is given by the row above; match the tool to the listed values.
Common Applications for M8 Spring Lock Washers
M8 Spring Lock Washers 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.