M2 Socket Set Screws (ISO 4026 / ISO 4029 / DIN 913-916) are specified by thread size, length and head dimensions. The M2 row from the standard is reproduced below, followed by the drill sizes, spanner size and torque values used when installing this size.
M2 Dimensional Row (ISO 4026 / ISO 4029 / DIN 913-916)
| Size | Pitch (mm) | Hex socket s (mm) | Engagement depth t min (mm) | Point diameter dp (mm) | End type | Reference standard |
|---|---|---|---|---|---|---|
| M2 | 0.4 | 0.9 | 0.9 | 1.0 | Flat point | ISO 4026 / DIN 913-916 |
Spanner & Drive for M2 Socket Set Screws
The hex socket for M2 Socket Set Screws 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.
Common Applications for M2 Socket Set Screws
M2 Socket Set Screws are commonly specified for electronics, PCB hardware, optical mounts and small-scale machinery.
Installation Tips for M2 Socket Set Screws
- 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 M2 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 M2
For M2, pair with a M2 hex nut (ISO 4032 / DIN 934) and, where used, a M2 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
