The M24 size of Phillips Countersunk Self-Tapping Screw is dimensioned by GB/T 846 / ISO 7050. The table below gives the dimensional row from the standard, followed by the drive and the installation notes for this type.
M24 Dimensional Row (GB/T 846 / ISO 7050)
| Size | Pitch (mm) | Length L (mm) | Head diameter dk (mm) | Head height k (mm) | Cross recess | Countersink angle (deg) | Reference standard |
|---|---|---|---|---|---|---|---|
| M24 | 3.0 | 150 | 43.5 | 12.0 | PH4 | 90 | ISO 7046 / GB/T 819 |
Spanner & Drive for M24 Phillips Countersunk Self-Tapping Screw — GB/T 846 / ISO 7050 (Series 028)
The hex socket for M24 Phillips Countersunk Self-Tapping Screw — GB/T 846 / ISO 7050 (Series 028) is shown in the spec table — use the matching Allen / hex key (an ISO 2936 hex key set covers the full range). For production work use a torque-controlled driver so the seating force is consistent from part to part.
Common Applications for M24 Phillips Countersunk Self-Tapping Screw — GB/T 846 / ISO 7050 (Series 028)
M24 Phillips Countersunk Self-Tapping Screw — GB/T 846 / ISO 7050 (Series 028) are commonly specified for heavy assembly and large machine mounts.
Installation Tips for M24 Phillips Countersunk Self-Tapping Screw — GB/T 846 / ISO 7050 (Series 028)
- 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 M24 the stretch in the bolt becomes the controlling factor — for critical joints, use angle-controlled or stretch-controlled tightening instead of pure torque.
Mating Parts for M24
For M24, pair with a M24 hex nut (ISO 4032 / DIN 934) and, where used, a M24 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
