The M3 size of Spring Lock Washers is dimensioned by ISO 7980 / DIN 127. The tables below give the dimensional row from the standard, the drill and spanner sizes that go with it, and the assembly torque per property class. The technical drawing on this page redraws to the exact values selected.
M3 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 |
|---|---|---|---|---|---|
| M3 | 3.1 | 6.2 | 2.0 | 0.8 | ISO 7980 / DIN 127 |
Spanner & Drive for M3 Spring Lock Washers
Drive geometry for M3 Spring Lock Washers is given by the row above; match the tool to the listed values.
Common Applications for M3 Spring Lock Washers
M3 Spring Lock Washers are commonly specified for small electronics hardware and precision assemblies.
Installation Tips for M3 Spring Lock Washers
- 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.
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.