# Ball-ended tube: Ø30 ball on a Ø12 tube, Ø8 bore through

> What is the ball half of a tube ball 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/ball-end-tube-d30-12x8/ · JSON: https://xemstudio.com/api/geometry?object=ball-end-tube-d30-12x8 · Plain text: https://xemstudio.com/objects/ball-end-tube-d30-12x8/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 30.0 | 30.0 | 59.46 |

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

## Notes

- Ø30 ball with a Ø12 tube 45 mm long coming out of it, Ø8 bore through both: it seats in the spherical cup of the socket and can swing in any direction while the bore stays connected.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| ball | Ø30 |
| tube | Ø12 × 45 from the ball centre |
| bore | Ø8 |

## 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. 249: figure, his text and an animation](https://507movements.com/mm_249.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/tube-ball-and-socket-joint-mechanism/) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/ball-end-tube-d30-12x8/index.json · license: https://xemstudio.com/files/hardware/ball-end-tube-d30-12x8/LICENSE.md

- ball-end-tube-d30-12x8: [STEP](https://xemstudio.com/files/hardware/ball-end-tube-d30-12x8/ball-end-tube-d30-12x8.step) · [STL](https://xemstudio.com/files/hardware/ball-end-tube-d30-12x8/ball-end-tube-d30-12x8.stl) — ball centre at the origin, tube along +Z

## Questions

**What is the ball half of a tube ball joint?**

Ø30 ball with a Ø12 tube 45 mm long coming out of it, Ø8 bore through both: it seats in the spherical cup of the socket and can swing in any direction while the bore stays connected.

## Fits with

- [Ball-and-socket joint for tubing](https://xemstudio.com/objects/tube-ball-and-socket-joint-mechanism/)