M3 Nyloc Lock Nuts are manufactured to DIN 985 / ISO 7040 with a coarse thread pitch of 0.5 mm. This page lists the controlling dimensions for the M3 size — head geometry, width across flats, matching spanner size — together with the clearance hole, tapping drill and tightening torque used at assembly.
M3 Dimensional Row (DIN 985 / ISO 7040)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e min (mm) | Total height m (mm) | Metal height (mm) | Reference standard | Notes |
|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 5.5 | 6.01 | 4.0 | 2.4 | DIN 985 / ISO 7040 | With nylon insert, single use |
Spanner & Drive for M3 Nyloc Lock Nuts
Drive geometry for M3 Nyloc Lock Nuts is given by the row above; match the tool to the listed values.
Common Applications for M3 Nyloc Lock Nuts
M3 Nyloc Lock Nuts are commonly specified for paired with the same-size screws on PCB hardware, light enclosures and small-scale assemblies.
Mating Parts for M3
Pair M3 with the matching M3 bolt or screw, plus a M3 flat washer where required to distribute load on softer materials.
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.