For Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 002), the M6 thread sits in the small-to-medium range of the catalog and is one of the most-asked hex head bolt — gb/t 5782 / iso 4014 (series 002) in this family. The dimensional and assembly data follow.
M6 Dimensional Row (GB/T 5782 / ISO 4014)
| Size | Pitch (mm) | Nominal diameter d (mm) | Length L (mm) | Width across flats s (mm) | Width across corners e (mm) | Head height k (mm) |
|---|---|---|---|---|---|---|
| M6 | 1.0 | 6 | 40 | 10.0 | 11.05 | 4.0 |
Spanner & Drive for M6 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 002)
M6 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 002) 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.
Hole Sizes for M6
| Coarse-thread pitch (ISO 724) | 1 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 6.6 mm |
| Tapping drill, coarse thread | 5 mm |
Tightening Torque for M6
| Class 8.8 (dry, ~µ 0.125) | ≈ 10 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 14 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 17 Nm |
Indicative dry-joint values. Lubrication can lower the required torque by 15–25%. Always confirm against the joint design, especially when going up a strength class.
Common Applications for M6 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 002)
M6 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 002) are commonly specified for general-purpose machinery, jigs, fixturing and light structural connections.
Installation Tips for M6 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 002)
- 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.
When to Step Up or Down from M6
When the joint preload approaches the proof load of M6 class 8.8, step up to M8 class 8.8 (or move to M6 class 10.9). When the joint is over-specified, M5 often saves weight and cost without losing the safety margin.