# Pin (stud) clutch: studs on a sliding disc enter holes in a fixed disc

> How does a pin clutch couple two shafts?

- Category: Mechanisms › Couplings & joints
- Kind: Hardware
- Basis: Xem Studio design following Brown No. 52 (1868)
- Page: https://xemstudio.com/objects/pin-clutch-mechanism/ · JSON: https://xemstudio.com/api/geometry?object=pin-clutch-mechanism · Plain text: https://xemstudio.com/objects/pin-clutch-mechanism/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/)

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

## Notes

- Two shafts end to end: one carries a disc with holes, the other a disc with studs that slides on a feather key. Pushed together, the studs enter the holes and the shafts turn as one; pulled back, they are free.
- Here Ø50 × 8 discs, four Ø6 studs on a 16 mm radius, Ø8 shafts with a 2 × 2 feather key; drawn engaged (studs fully home). Engage it only at rest or slow speed: it is a positive clutch, with no slip.
- Brown's No. 52.
- Parts (each has its own page): pin-clutch-disc-4-holes-50, pin-clutch-disc-4-studs-50-keyed, keyed-shaft-8x100-key2, feather-key-2x2x30, linear-shafts-h6.
- Brown's movement No. 52 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

## Sizes

| parameter | value |
|---|---|
| discs | 2 × Ø50 × 8 |
| studs | 4 × Ø6 × 10 on R16 |
| shafts | Ø8, key 2 × 2 |

## 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. 52: figure, his text and an animation](https://507movements.com/mm_052.html) — web — Publisher's page; dimensions are facts

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

Index: https://xemstudio.com/files/hardware/pin-clutch-mechanism/index.json · license: https://xemstudio.com/files/hardware/pin-clutch-mechanism/LICENSE.md

- pin-clutch-mechanism-assembly: [STEP](https://xemstudio.com/files/hardware/pin-clutch-mechanism/pin-clutch-mechanism-assembly.step) · [STL](https://xemstudio.com/files/hardware/pin-clutch-mechanism/pin-clutch-mechanism-assembly.stl) — Assembled mechanism, all parts placed at one pose (STEP keeps each part separate)

## Questions

**How does a pin clutch couple two shafts?**

Two shafts end to end: one carries a disc with holes, the other a disc with studs that slides on a feather key. Pushed together, the studs enter the holes and the shafts turn as one; pulled back, they are free.

## Fits with

- [Pin-clutch disc Ø50 × 8 with four Ø6 holes on R16, Ø8 bore](https://xemstudio.com/objects/pin-clutch-disc-4-holes-50/)
- [Pin-clutch disc Ø50 × 8 with four Ø6 × 10 studs, Ø8 bore with 2 mm keyway](https://xemstudio.com/objects/pin-clutch-disc-4-studs-50-keyed/)
- [Shaft Ø8 × 100 with a 2 × 1 keyway (60 mm)](https://xemstudio.com/objects/keyed-shaft-8x100-key2/)
- [Feather key 2 × 2 × 30](https://xemstudio.com/objects/feather-key-2x2x30/)
- [Linear shafts Ø3 to Ø25 mm (h6), 100 to 1000 mm long](https://xemstudio.com/objects/linear-shafts-h6/)