For Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056), the M5 thread sits in the small-to-medium range of the catalog and is one of the most-asked thin hex nut, fine pitch — gb/t 6173 / iso 8675 (series 056) in this family. The dimensional and assembly data follow.
M5 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 |
|---|---|---|---|---|---|
| M5 | 0.8 | 8.0 | 8.79 | 2.7 | ISO 4035 / GB/T 6172 |
Spanner & Drive for M5 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056)
M5 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056) have a width across flats of 8.0 mm — fit a 8.0 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 M5 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056)
M5 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.
Installation Tips for M5 Thin Hex Nut, Fine Pitch — GB/T 6173 / ISO 8675 (Series 056)
- Use a 6-point socket where access allows — 12-point sockets are more prone to rounding the corners on smaller sizes.
- On flanged or serrated variants, do NOT add a separate flat washer — the flange already spreads the load and the washer can defeat the locking serrations.
- At M5 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
Mating Parts for M5
Pair M5 with the matching M5 bolt or screw, plus a M5 flat washer where required to distribute load on softer materials.
When to Step Up or Down from M5
When the joint preload approaches the proof load of M5 class 8.8, step up to M6 class 8.8 (or move to M5 class 10.9). When the joint is over-specified, M4 often saves weight and cost without losing the safety margin.