For Torx Recessed Countersunk Screw — GB/T 2673 / ISO 14587 (Series 024), the M16 thread sits in the medium range of the catalog and is one of the most-asked torx recessed countersunk screw — gb/t 2673 / iso 14587 (series 024) in this family. The dimensional and assembly data follow.
M16 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 |
|---|---|---|---|---|---|---|---|
| M16 | 2.0 | 100 | 29.0 | 8.0 | PH4 | 90 | ISO 7046 / GB/T 819 |
Spanner & Drive for M16 Torx Recessed Countersunk Screw — GB/T 2673 / ISO 14587 (Series 024)
The hex socket for M16 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 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 Torx Recessed Countersunk Screw — GB/T 2673 / ISO 14587 (Series 024)
M16 Torx Recessed Countersunk Screw — GB/T 2673 / ISO 14587 (Series 024) are commonly specified for heavier machine assembly and equipment mounting.
Installation Tips for M16 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.
When to Step Up or Down from M16
When the joint preload approaches the proof load of M16 class 8.8, step up to M20 class 8.8 (or move to M16 class 10.9). When the joint is over-specified, M12 often saves weight and cost without losing the safety margin.