# Brake strap 20 × 1.5 wrapped 228.78° round a Ø60 drum, eyes on Ø4 pins 24 mm apart

> What is a strap brake band?

- 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/brake-strap-20x1-5-drum60-pins24/ · JSON: https://xemstudio.com/api/geometry?object=brake-strap-20x1-5-drum60-pins24 · Plain text: https://xemstudio.com/objects/brake-strap-20x1-5-drum60-pins24/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 |
|---|---|---|
| 63.0 | 83.0 | 20.0 |

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

## Notes

- Steel strap 20 wide, 1.5 thick, bent to the Ø60 drum (inside radius 30, line on line) over 228.78°, its two straight legs running tangent from the drum to eyes (Ø4 bore) round the lever's two pins, 24 mm apart and 48 mm below the drum's axis; drawn at its working shape.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| strap | 20 × 1.5 |
| wrap | 228.78° |
| eyes | Ø4, 24 mm apart |

## 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. 242: figure, his text and an animation](https://507movements.com/mm_242.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/crane-strap-brake-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/brake-strap-20x1-5-drum60-pins24/index.json · license: https://xemstudio.com/files/hardware/brake-strap-20x1-5-drum60-pins24/LICENSE.md

- brake-strap-20x1-5-drum60-pins24: [STEP](https://xemstudio.com/files/hardware/brake-strap-20x1-5-drum60-pins24/brake-strap-20x1-5-drum60-pins24.step) · [STL](https://xemstudio.com/files/hardware/brake-strap-20x1-5-drum60-pins24/brake-strap-20x1-5-drum60-pins24.stl) — strap in place, drum axis at the origin, z 0..20

## Questions

**What is a strap brake band?**

Steel strap 20 wide, 1.5 thick, bent to the Ø60 drum (inside radius 30, line on line) over 228.78°, its two straight legs running tangent from the drum to eyes (Ø4 bore) round the lever's two pins, 24 mm apart and 48 mm below the drum's axis; drawn at its working shape.

## Fits with

- [Crane strap brake: steel strap round a drum, tightened by a lever](https://xemstudio.com/objects/crane-strap-brake-mechanism/)