When you need Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 001) in the M16 size, the controlling values come from GB/T 5782 / ISO 4014. This page lists them in one place — pitch, head geometry, tool size and the matching hole.
M16 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) |
|---|---|---|---|---|---|---|
| M16 | 2.0 | 16 | 100 | 24.0 | 26.75 | 10.0 |
Spanner & Drive for M16 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 001)
M16 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 001) have a width across flats of 24.0 mm — fit a 24.0 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 M16
| Coarse-thread pitch (ISO 724) | 2 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 17.5 mm |
| Tapping drill, coarse thread | 14 mm |
Tightening Torque for M16
| Class 8.8 (dry, ~µ 0.125) | ≈ 210 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 295 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 355 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 M16 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 001)
M16 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 001) are commonly specified for medium-duty structural connections, automotive sub-frames and equipment chassis.
Installation Tips for M16 Hex Head Bolt — GB/T 5782 / ISO 4014 (Series 001)
- 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 M16
For M16, pair with a M16 hex nut (ISO 4032 / DIN 934) and, where used, a M16 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.