ISO 7380-1 button head socket screw: dimensions
Hexagon socket button head screw with a low domed head, fully threaded.
ISO 7380-1 dimensions
| Size | Pmm | dkmax, mm | kmax, mm | snom, mm | emin, mm | tmin, mm | dwmin, mm | damax, mm |
|---|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 5.7 | 1.65 | 2 | 2.303 | 1.04 | 5 | 3.6 |
| M4 | 0.7 | 7.6 | 2.2 | 2.5 | 2.873 | 1.3 | 6.84 | 4.7 |
| M5 | 0.8 | 9.5 | 2.75 | 3 | 3.443 | 1.56 | 8.74 | 5.7 |
| M6 | 1 | 10.5 | 3.3 | 4 | 4.583 | 2.08 | 9.57 | 6.8 |
| M8 | 1.25 | 14 | 4.4 | 5 | 5.723 | 2.6 | 13.07 | 9.2 |
| M10 | 1.5 | 17.5 | 5.5 | 6 | 6.863 | 3.12 | 16.57 | 11.2 |
| M12 | 1.75 | 21 | 6.6 | 8 | 9.149 | 4.16 | 19.68 | 13.7 |
| M16 | 2 | 28 | 8.8 | 10 | 11.429 | 5.2 | 26.68 | 17.7 |
Dimensions in millimetres unless stated. Select a row to load its CAD files above.
ISO 7380 button head screw dimensions
The domed head is wide and low: at M6 it is up to 10.5 mm across and 3.3 mm high, against 10 × 6 mm for a socket head cap screw. The socket is smaller, a 4 mm key at M6, so the screw takes less tightening torque. It is used where the head must stand out little, on covers, guards and panels.
ISO 7380-1 and ISO 7380-2
Part 1 is the plain button head. ISO 7380-2 adds a collar under the head that acts as a washer. Both are often searched as ISO 7380, so check the part number.
ISO 7380 screws: common questions
- What key fits an M6 button head screw?
- A 4 mm hexagon key for ISO 7380-1, one size smaller than for a socket head cap screw.