DIN 912 dimensions
Hexagon socket head cap screws — the cylindrical head driven by a hex key.
The DIN number. Superseded by ISO 4762, and still what everyone orders by.
What DIN 912 is
DIN 912 is the socket head cap screw: a cylindrical head with a hexagon socket sunk into it, driven by a hex key rather than a spanner. It is the fastener of choice where there is no room to swing a spanner and where the head can sit in a counterbore.
DIN 912 dimensions, M2 to M24
| Size | Pitch | Hex key | Clearance hole | Tapping drill |
|---|---|---|---|---|
| M2 | 0.4 mm | 1.5 mm | 2.4 mm | 1.6 mm |
| M2.5 | 0.45 mm | 2 mm | 2.9 mm | 2.05 mm |
| M3 | 0.5 mm | 2.5 mm | 3.4 mm | 2.5 mm |
| M4 | 0.7 mm | 3 mm | 4.5 mm | 3.3 mm |
| M5 | 0.8 mm | 4 mm | 5.5 mm | 4.2 mm |
| M6 | 1 mm | 5 mm | 6.6 mm | 5 mm |
| M8 | 1.25 mm | 6 mm | 9 mm | 6.75 mm |
| M10 | 1.5 mm | 8 mm | 11 mm | 8.5 mm |
| M12 | 1.75 mm | 10 mm | 13.5 mm | 10.25 mm |
| M14 | 2 mm | 12 mm | 15.5 mm | 12 mm |
| M16 | 2 mm | 14 mm | 17.5 mm | 14 mm |
| M20 | 2.5 mm | 17 mm | 22 mm | 17.5 mm |
| M24 | 3 mm | 19 mm | 26 mm | 21 mm |
DIN 912 against ISO 4762
These two agree. DIN 912 and ISO 4762 describe the same socket head cap screw, take the same hex key, and suppliers list them on one line as "DIN 912 / ISO 4762". Ordering by either number gets the same part.
Frequently asked questions
What is DIN 912?
Hexagon socket head cap screws — the cylindrical head driven by a hex key. Its ISO equivalent is ISO 4762.
Is DIN 912 the same as ISO 4762?
Yes, for practical purposes. DIN 912 and ISO 4762 describe the same socket head cap screw and suppliers list them together. A part sold as one will fit where the other is specified.
What size hex key does an M10 DIN 912 take?
8 mm. Socket head cap screws are driven by a hex key rather than a spanner, and the socket size follows the thread rather than the head.
Is DIN 912 still current?
Not formally — DIN 912 has been superseded by ISO 4762. It remains the number everyone uses: catalogues, drawings and purchase orders are still written in DIN numbers, and a supplier asked for DIN 912 will ship a part made to ISO 4762.
Other fastener standards
- ISO 4762 — Hexagon socket head cap screws — the ISO standard matching DIN 912
- DIN 934 — Hexagon nuts — the plain hex nut
- ISO 4032 — Hexagon regular nuts, style 1 — the ISO standard that replaced DIN 934
- DIN 933 — Hexagon head bolts threaded all the way to the head — DIN’s own title calls these “set screws”, which today reads as a grub screw and is not what this is
- ISO 4017 — Hexagon head screws, fully threaded — the ISO standard that replaced DIN 933
Every fastener standard here · Metric thread sizes · Tap drill sizes · Spanner sizes