M5 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034) is the m5-thread variant of Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034) manufactured to GB/T 818 / ISO 7045. This page focuses on the data engineers reach for at the bench: dimensional values for the M5 size, the spanner/drive that fits, and the assembly data you need to install it.
M5 Dimensional Row (GB/T 818 / ISO 7045)
| Size | Pitch (mm) | Length L (mm) | Head diameter dk (mm) | Head height k (mm) | Cross recess | Reference standard |
|---|---|---|---|---|---|---|
| M5 | 0.8 | 30 | 9.5 | 3.0 | PH2 | ISO 7045 / GB/T 818 |
Spanner & Drive for M5 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034)
M5 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034) use a PH2 cross recess. Match the driver bit to the recess (Phillips PH / Pozi PZ are NOT interchangeable).
Hole Sizes for M5
| Coarse-thread pitch (ISO 724) | 0.8 mm |
|---|---|
| Through-hole / clearance (ISO 273 medium) | 5.5 mm |
| Tapping drill, coarse thread | 4.2 mm |
Tightening Torque for M5
| Class 8.8 (dry, ~µ 0.125) | ≈ 5.8 Nm |
|---|---|
| Class 10.9 (dry, ~µ 0.125) | ≈ 8.1 Nm |
| Class 12.9 (dry, ~µ 0.125) | ≈ 9.7 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 M5 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034)
M5 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034) are commonly specified for electronics, PCB hardware, optical mounts and small-scale machinery.
Installation Tips for M5 Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034)
- Pozidriv (PZ) drivers ride out of Phillips (PH) recesses and vice versa — confirm the recess marking on the head before assembly.
- For automated assembly, an ACR (Anti-Cam-Out Ribs) or torx-equivalent driver gives noticeably longer bit life than plain PH.
- At M5 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 M5
When the joint preload approaches the proof load of M5 class 8.8, step up to M6 class 8.8 (or move to M5 class 10.9). When the joint is over-specified, M4 often saves weight and cost without losing the safety margin.