# 7 mm RC wheel hex

> What size is a 7 mm RC wheel hex and which cars use it?

- Category: RC cars › Wheel hexes
- Kind: Standard part
- Basis: Secondary source: RC Car Action (Traxxas release) (copy of the maker's figures; the maker publishes none directly)
- Page: https://xemstudio.com/objects/rc-wheel-hex-7mm/ · JSON: https://xemstudio.com/api/geometry?object=rc-wheel-hex-7mm · Plain text: https://xemstudio.com/objects/rc-wheel-hex-7mm/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width |
|---|---|
| 7 | 7 |

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

## Notes

- A 7 mm wheel hex is the hexagonal drive between axle and wheel; 7 mm is the across-flats size. The file is a 7 mm across-flats hexagon profile.
- Hex thickness, drive-pin size and bore are not published as a standard and are not modelled.
- True size, no printing tolerance added. Only published numbers are used; anything not published is said so.
- Secondary source: the numbers come from a retailer or magazine copy of the maker's specification.

## Sizes

| dimension | value |
|---|---|
| Across flats | 7 mm |
| Used on (published) | Traxxas TRX-4M (Bronco, K10) |

## Where the files are

- RC Car Action (Traxxas release): [TRX-4M Chevrolet K10 High Trail](https://www.rccaraction.com/?p=370072) — web — Publisher's page; dimensions are facts

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

Index: https://xemstudio.com/files/hardware/rc-wheel-hex-7mm/index.json

- rc-wheel-hex-7mm-hex-profile: [STEP](https://xemstudio.com/files/hardware/rc-wheel-hex-7mm/rc-wheel-hex-7mm-hex-profile.step) · [STL](https://xemstudio.com/files/hardware/rc-wheel-hex-7mm/rc-wheel-hex-7mm-hex-profile.stl) — Hexagon 7 mm across flats, 1 mm reference thickness (hub length not published)

## Questions

**Which RC cars use 7 mm hexes?**

Traxxas TRX-4M (Bronco, K10).

## Fits with

- [12 mm RC wheel hex](https://xemstudio.com/objects/rc-wheel-hex-12mm/)
- [14 mm RC wheel hex](https://xemstudio.com/objects/rc-wheel-hex-14mm/)
- [17 mm RC wheel hex](https://xemstudio.com/objects/rc-wheel-hex-17mm/)
- [24 mm RC wheel hex](https://xemstudio.com/objects/rc-wheel-hex-24mm/)