When you need Spring Lock Washers in the M12 size, the controlling values come from ISO 7980 / DIN 127. This page lists them in one place — pitch, head geometry, tool size and the matching hole.
M12 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 |
|---|---|---|---|---|---|
| M12 | 12.2 | 21.1 | 7.0 | 2.5 | ISO 7980 / DIN 127 |
Spanner & Drive for M12 Spring Lock Washers
Drive geometry for M12 Spring Lock Washers is given by the row above; match the tool to the listed values.
Common Applications for M12 Spring Lock Washers
M12 Spring Lock Washers are commonly specified for medium-duty structural joints.
Mating Parts for M12
A M12 flat washer pairs with a M12 bolt/screw and matching M12 nut.
When to Step Up or Down from M12
When the joint preload approaches the proof load of M12 class 8.8, step up to M16 class 8.8 (or move to M12 class 10.9). When the joint is over-specified, M10 often saves weight and cost without losing the safety margin.