# Cardan joint cross (spider) 14 × 14, 7 mm arms, Ø3 pin holes

> What is the cross of a universal joint?

- Category: Hardware › Mechanism parts
- Kind: Modern device
- Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
- Page: https://xemstudio.com/objects/cardan-spider-14/ · JSON: https://xemstudio.com/api/geometry?object=cardan-spider-14 · Plain text: https://xemstudio.com/objects/cardan-spider-14/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 14.0 | 14.0 | 7.0 |

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Cross of two 7 × 7 mm arms, 14 mm across (the fork gap): a Ø3 hole straight through one arm for the long pin (dowel 3 × 20) and two Ø3 holes in the other arm from its ends to 2 mm from the centre for two short pins (dowel 3 × 10); the four pin ends are the trunnions the yokes turn on.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| arms | 7 × 7 mm, 14 across |
| through hole | Ø3 along X |
| blind holes | 2 × Ø3, 5 deep, along Y |

## Where the files are

- Henry T. Brown (1868, public domain): [Five Hundred and Seven Mechanical Movements — scan on archive.org](https://archive.org/details/fivehundredseven00browiala) — web — Publisher's page; dimensions are facts
- 507movements.com: [Brown's movement No. 50: figure, his text and an animation](https://507movements.com/mm_050.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/universal-joint-mechanism/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/cardan-spider-14/index.json

- cardan-spider-14: [STEP](https://xemstudio.com/files/hardware/cardan-spider-14/cardan-spider-14.step) · [STL](https://xemstudio.com/files/hardware/cardan-spider-14/cardan-spider-14.stl) — spider, centred on the origin

## Questions

**What is the cross of a universal joint?**

Cross of two 7 × 7 mm arms, 14 mm across (the fork gap): a Ø3 hole straight through one arm for the long pin (dowel 3 × 20) and two Ø3 holes in the other arm from its ends to 2 mm from the centre for two short pins (dowel 3 × 10); the four pin ends are the trunnions the yokes turn on.

## Fits with

- [Universal (Hooke / Cardan) joint, drawn at 30°](https://xemstudio.com/objects/universal-joint-mechanism/)