M6 is one of the standard coarse-thread sizes for thin hex nut under GB/T 901 / DIN 939. The sections below reproduce the dimensional row, list the matching tools and hole sizes, and summarize where this size is normally specified.
M6 Dimensional Row (GB/T 901 / DIN 939)
| Size | Pitch (mm) | Width across flats s (mm) | Width across corners e (mm) | Nut height m (mm) | Reference standard |
|---|---|---|---|---|---|
| M6 | 1.0 | 10.0 | 11.05 | 3.2 | ISO 4035 / GB/T 6172 |
Spanner & Drive for M6 Thin Hex Nut — GB/T 901 / DIN 939 (Series 094)
M6 Thin Hex Nut — GB/T 901 / DIN 939 (Series 094) have a width across flats of 10.0 mm — fit a 10.0 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 M6 Thin Hex Nut — GB/T 901 / DIN 939 (Series 094)
M6 Thin Hex Nut — GB/T 901 / DIN 939 (Series 094) are commonly specified for general-purpose joints in machinery, fixturing and equipment frames.
Installation Tips for M6 Thin Hex Nut — GB/T 901 / DIN 939 (Series 094)
- 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.
Mating Parts for M6
Pair M6 with the matching M6 bolt or screw, plus a M6 flat washer where required to distribute load on softer materials.