When you need Torx Recessed Countersunk Screw — GB/T 2673 / ISO 14587 (Series 024) in the M5 size, the controlling values come from GB/T 2673 / ISO 14587. This page lists them in one place — pitch, head geometry, tool size and the matching hole.
M5 Dimensional Row (GB/T 2673 / ISO 14587)
| Size | Pitch (mm) | Length L (mm) | Head diameter dk (mm) | Head height k (mm) | Cross recess | Countersink angle (deg) | Reference standard |
|---|---|---|---|---|---|---|---|
| M5 | 0.8 | 30 | 9.2 | 2.5 | PH2 | 90 | ISO 7046 / GB/T 819 |
Spanner & Drive for M5 Torx Recessed Countersunk Screw — GB/T 2673 / ISO 14587 (Series 024)
The hex socket for M5 Torx Recessed Countersunk Screw — GB/T 2673 / ISO 14587 (Series 024) is shown in the spec table — use the matching Allen / hex key (an ISO 2936 hex key set covers the full range). A T-handle Allen key gives the best feel for setting preload by feel; for production work use a torque-controlled driver.
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 Torx Recessed Countersunk Screw — GB/T 2673 / ISO 14587 (Series 024)
M5 Torx Recessed Countersunk Screw — GB/T 2673 / ISO 14587 (Series 024) are commonly specified for electronics, PCB hardware, optical mounts and small-scale machinery.
Installation Tips for M5 Torx Recessed Countersunk Screw — GB/T 2673 / ISO 14587 (Series 024)
- Use a quality Allen key fully seated in the socket — partial engagement is the most common cause of stripped sockets at this size.
- For countersunk and button-head variants, chamfer the through-hole to seat the head flush without preloading the head/shank fillet.
- 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.
Mating Parts for M5
For M5, pair with a M5 hex nut (ISO 4032 / DIN 934) and, where used, a M5 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.