M22 Socket Head Cap Screws are manufactured to ISO 4762 / DIN 912 with a coarse thread pitch of the standard value. This page lists the controlling dimensions for the M22 size — head geometry, width across flats, matching spanner size — together with the clearance hole, tapping drill and tightening torque used at assembly.
M22 Dimensional Row (ISO 4762 / DIN 912)
| Size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Hex key s (mm) | Socket depth t min (mm) | Reference standard |
|---|---|---|---|---|---|---|
| M22 | 2.5 | 33.0 | 22.0 | 17.0 | 11.0 | ISO 4762 / DIN 912 |
Spanner & Drive for M22 Socket Head Cap Screws
The hex socket for M22 Socket Head Cap 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 M22 Socket Head Cap Screws
M22 Socket Head Cap Screws are commonly specified for heavy assembly and large machine mounts.
Installation Tips for M22 Socket Head Cap 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 M22 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 M22
For M22, pair with a M22 hex nut (ISO 4032 / DIN 934) and, where used, a M22 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
