M2.5 Phillips Countersunk Screws are manufactured to ISO 7046 / DIN 965 with a coarse thread pitch of the standard value. This page lists the controlling dimensions for the M2.5 size — head geometry, width across flats, matching spanner size — together with the clearance hole, tapping drill and tightening torque used at assembly.
M2.5 Dimensional Row (ISO 7046 / DIN 965)
| Size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Cross recess | Countersink angle (deg) | Reference standard |
|---|---|---|---|---|---|---|
| M2.5 | 0.45 | 4.7 | 1.5 | PH1 | 90 | ISO 7046 / DIN 965 |
Spanner & Drive for M2.5 Phillips Countersunk Screws
The hex socket for M2.5 Phillips Countersunk 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 M2.5 Phillips Countersunk Screws
M2.5 Phillips Countersunk Screws are commonly specified for electronics, PCB hardware, optical mounts and small-scale machinery.
Installation Tips for M2.5 Phillips Countersunk 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 M2.5 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 M2.5
For M2.5, pair with a M2.5 hex nut (ISO 4032 / DIN 934) and, where used, a M2.5 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
