# Dowel pin (ISO 2338 / DIN 7)

Parallel pin of unhardened steel or austenitic stainless steel, d 0.6 to 50 mm, any length, with catalogue sizes as
presets (4 × 20, 6 × 30, ...).

## Geometry

A cylinder of the nominal diameter **d** and length **l** with the end chamfer **c** on both ends. ISO 2338 gives c
as an approximate value; it is drawn at 45°. One end face is on the XY plane at the origin, the pin along +Z.

## Parameters

| Parameter | Meaning |
|---|---|
| `diameter` | Nominal diameter d, mm (0.6 to 50) |
| `length` | Length l, mm |
| `material` | `steel` (unhardened), `stainless-a1` (austenitic stainless) |

## Source

ISO 2338:1997 (DIN EN ISO 2338:1998), *Parallel pins, of unhardened steel and austenitic stainless steel*,
dimension table: d and c ≈ (mm), read from the reproduction on fasten.it ("reproduced by permission of DIN", <https://www.fasten.it/en/Norms/Norm/DIN%20EN%20ISO%202338>).

| d | c |
|---|---|
| 0.6 | 0.12 |
| 0.8 | 0.16 |
| 1 | 0.2 |
| 1.2 | 0.25 |
| 1.5 | 0.3 |
| 2 | 0.35 |
| 2.5 | 0.4 |
| 3 | 0.5 |
| 4 | 0.63 |
| 5 | 0.8 |
| 6 | 1.2 |
| 8 | 1.6 |
| 10 | 2 |
| 12 | 2.5 |
| 16 | 3 |
| 20 | 3.5 |
| 25 | 4 |
| 30 | 5 |
| 40 | 6.3 |
| 50 | 8 |

Preset list: sizes of the step.parts catalogue (MIT), see `library/NOTICE.md`. The catalogue's 4 mm pin with an M3 set-screw thread is not an ISO 2338 pin and has no preset.