# Lifting tong arm 12 × 5: link hole 60 mm and foot 80 mm either side of the pivot

> What is a lifting tong arm?

- 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/lifting-tong-arm-140-foot/ · JSON: https://xemstudio.com/api/geometry?object=lifting-tong-arm-140-foot · Plain text: https://xemstudio.com/objects/lifting-tong-arm-140-foot/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 |
|---|---|---|
| 153.81 | 19.33 | 5.0 |

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

## Notes

- 12 × 5 flat arm with Ø3 holes for the link (60 mm from the pivot) and the crossing pivot, and at 80 mm beyond the pivot a 12 mm deep foot whose face is square to the load when the arms are crossed at ±22.02° on a 40 mm load. Two arms, one turned over, make the tongs.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

## Sizes

| dimension | value |
|---|---|
| arm | 140 mm between end holes, 12 × 5 |
| holes | Ø3 at −60 and 0 |
| foot | projects 10 mm, 12 deep |
| arm angle | ±22.02° on a 40 mm load |

## 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. 494: figure, his text and an animation](https://507movements.com/mm_494.html) — web — Publisher's page; dimensions are facts
- Xem Studio: [drawing](https://xemstudio.com/objects/lifting-tongs-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/lifting-tong-arm-140-foot/index.json · license: https://xemstudio.com/files/hardware/lifting-tong-arm-140-foot/LICENSE.md

- lifting-tong-arm-140-foot: [STEP](https://xemstudio.com/files/hardware/lifting-tong-arm-140-foot/lifting-tong-arm-140-foot.step) · [STL](https://xemstudio.com/files/hardware/lifting-tong-arm-140-foot/lifting-tong-arm-140-foot.stl) — arm, z 0..5, pivot at the origin, foot end on +X

## Questions

**What is a lifting tong arm?**

12 × 5 flat arm with Ø3 holes for the link (60 mm from the pivot) and the crossing pivot, and at 80 mm beyond the pivot a 12 mm deep foot whose face is square to the load when the arms are crossed at ±22.02° on a 40 mm load. Two arms, one turned over, make the tongs.

## Fits with

- [Lifting tongs: load-tightened scissor grip](https://xemstudio.com/objects/lifting-tongs-mechanism/)