M4 Thin Hex Nut, Fine Pitch (GB/T 6173 / ISO 8675) are specified by thread size, length and head dimensions. The M4 row from the standard is reproduced below, followed by the drill sizes, spanner size and torque values used when installing this size.
M4 Dimensional Row (GB/T 6173 / ISO 8675)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e (mm) | Nut height m (mm) | Reference standard |
|---|---|---|---|---|---|
| M4 | 0.7 | 7.0 | 7.66 | 2.2 | ISO 4035 / GB/T 6172 |
Spanner & Drive for M4 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056)
M4 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056) have a width across flats of 7.0 mm — fit a 7.0 mm open-ended spanner or socket. Use a 6-point socket for tight clearances and to reduce rounding; for repeated assembly choose a torque wrench so the joint preload is repeatable.
Common Applications for M4 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056)
M4 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056) are commonly specified for paired with the same-size screws on PCB hardware, light enclosures and small-scale assemblies.
Mating Parts for M4
Pair M4 with the matching M4 bolt or screw, plus a M4 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M4
When the joint preload approaches the proof load of M4 class 8.8, step up to M5 class 8.8 (or move to M4 class 10.9). When the joint is over-specified, M3 often saves weight and cost without losing the safety margin.