# Socket head cap screw (ISO 4762 / DIN 912)

Hexagon socket head cap screw, metric coarse thread, M1.6 to M64, at any length. Presets cover the common catalogue
sizes (M3 × 10, M5 × 20, ...).

## Geometry

Envelope for assemblies and clearance checks:

- cylindrical head, diameter **dk max** (plain head), height **k max**;
- hexagon socket, key size **s** (nominal), depth **t min**, flat bottom;
- plain shank at the nominal thread diameter **d**, length **l** (`length`); the thread is not modelled.

The head's bearing face is on the XY plane at the origin, the head above it, the shank along -Z.

## Parameters

| Parameter | Meaning |
|---|---|
| `size` | Thread size, M1.6 to M64 |
| `length` | Nominal length l under the head, mm |
| `material` | `steel` (property class 8.8 to 12.9, black oxide), `stainless-a2`, `stainless-a4` (ISO 3506-1) |

## Source

ISO 4762:2004, *Hexagon socket head cap screws*, Table 1 (dimensions): d, dk max (plain head), k max, s (nominal
hexagon socket size), t min. M1.6 to M12 read from the official preview, p. 4
(<https://cdn.standards.iteh.ai/samples/34460/06335046afaf46fb8e84d91a3eda001d/ISO-4762-2004.pdf>); every size from
fasten.it's DIN EN ISO 4762:2004-06 ("reproduced by permission of DIN",
<https://fasten.it/en/Norms/Norm/DIN%20EN%20ISO%204762>); M14 to M64 also agree with ISO 4762:1997, Table 1, pp. 6-7
(<https://cdn.standards.iteh.ai/samples/24643/ff479778e7af4f3eb742ad5ca38881f2/ISO-4762-1997.pdf>). ISO 4762:2004 is
the current edition. DIN 912 sizes are the same for these columns.

| Size | dk | k | s | t |
|---|---|---|---|---|
| M1.6 | 3.0 | 1.6 | 1.5 | 0.7 |
| M2 | 3.8 | 2.0 | 1.5 | 1.0 |
| M2.5 | 4.5 | 2.5 | 2.0 | 1.1 |
| M3 | 5.5 | 3.0 | 2.5 | 1.3 |
| M4 | 7.0 | 4.0 | 3.0 | 2.0 |
| M5 | 8.5 | 5.0 | 4.0 | 2.5 |
| M6 | 10.0 | 6.0 | 5.0 | 3.0 |
| M8 | 13.0 | 8.0 | 6.0 | 4.0 |
| M10 | 16.0 | 10.0 | 8.0 | 5.0 |
| M12 | 18.0 | 12.0 | 10.0 | 6.0 |
| M14 | 21.0 | 14.0 | 12.0 | 7.0 |
| M16 | 24.0 | 16.0 | 14.0 | 8.0 |
| M20 | 30.0 | 20.0 | 17.0 | 10.0 |
| M24 | 36.0 | 24.0 | 19.0 | 12.0 |
| M30 | 45.0 | 30.0 | 22.0 | 15.5 |
| M36 | 54.0 | 36.0 | 27.0 | 19.0 |
| M42 | 63.0 | 42.0 | 32.0 | 24.0 |
| M48 | 72.0 | 48.0 | 36.0 | 28.0 |
| M56 | 84.0 | 56.0 | 41.0 | 34.0 |
| M64 | 96.0 | 64.0 | 46.0 | 38.0 |

Preset list: sizes and lengths of the step.parts catalogue (MIT), see `library/NOTICE.md`.