The M1.6 size of Hex Nuts is dimensioned by ISO 4032 / ISO 4033. The table below gives the dimensional row from the standard, followed by the drive and the installation notes for this type.
M1.6 Dimensional Row (ISO 4032 / ISO 4033)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e min (mm) | Nut height m style 1 (mm) | Nut height m style 2 (mm) | Reference standard |
|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 3.2 | 3.48 | 1.3 | - | ISO 4032 (Style1) / ISO 4033 (Style2) |
Spanner & Drive for M1.6 Hex Nuts
M1.6 Hex Nuts have a width across flats of 3.2 mm — fit a 3.2 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 M1.6 Hex Nuts
M1.6 Hex Nuts are commonly specified for paired with the same-size screws on PCB hardware, light enclosures and small-scale assemblies.
Installation Tips for M1.6 Hex Nuts
- 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 M1.6 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 M1.6
Pair M1.6 with the matching M1.6 bolt or screw, plus a M1.6 flat washer where required to distribute load on softer materials.
