M4 Hex Bolt, Fully Threaded — GB/T 5783 / ISO 4017 (Series 011) is the m4-thread variant of Hex Bolt, Fully Threaded — GB/T 5783 / ISO 4017 (Series 011) manufactured to GB/T 5783 / ISO 4017. This page focuses on the data engineers reach for at the bench: dimensional values for the M4 size, the spanner/drive that fits, and the assembly data you need to install it.
M4 Dimensional Row (GB/T 5783 / ISO 4017)
| Size | Pitch (mm) | Nominal diameter d (mm) | Length L (mm) | Width across flats s (mm) | Width across corners e (mm) | Head height k (mm) |
|---|---|---|---|---|---|---|
| M4 | 0.7 | 4 | 25 | 7.0 | 7.66 | 2.8 |
Spanner & Drive for M4 Hex Bolt, Fully Threaded — GB/T 5783 / ISO 4017 (Series 011)
M4 Hex Bolt, Fully Threaded — GB/T 5783 / ISO 4017 (Series 011) 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.
Hole Sizes for M4
| Coarse-thread pitch (ISO 724) | 0.7 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 4.5 mm |
| Tapping drill, coarse thread | 3.3 mm |
Tightening Torque for M4
| Class 8.8 (dry, ~µ 0.125) | ≈ 2.9 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 4.1 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 4.9 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 M4 Hex Bolt, Fully Threaded — GB/T 5783 / ISO 4017 (Series 011)
M4 Hex Bolt, Fully Threaded — GB/T 5783 / ISO 4017 (Series 011) are commonly specified for precision instruments, small machinery and consumer-electronics enclosures.
Installation Tips for M4 Hex Bolt, Fully Threaded — GB/T 5783 / ISO 4017 (Series 011)
- 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 M4 the joint is sensitive to over-torque — use a torque-limiting driver and check the head doesn't bury into a softer counterpart.
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.