Dimensional and assembly data for M48 Socket Set Screws to ISO 4026 / ISO 4029 / DIN 913-916. Includes head size and width across flats, clearance-hole and tapping-drill diameters, tightening torque per property class, and the sizes to step up or down to when the joint requires it.
M48 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 |
|---|---|---|---|---|---|---|
| M48 | 5.0 | 22.0 | 28.0 | 36.0 | Flat point | ISO 4026 / DIN 913-916 |
Spanner & Drive for M48 Socket Set Screws
The hex socket for M48 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 M48 Socket Set Screws
M48 Socket Set Screws are commonly specified for heavy assembly and large machine mounts.
Installation Tips for M48 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 M48 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 M48
For M48, pair with a M48 hex nut (ISO 4032 / DIN 934) and, where used, a M48 flat washer (ISO 7089 / DIN 125A) under the head and under the nut.
