# Feetech FS90R continuous rotation servo

> What are the dimensions of the Feetech FS90R continuous rotation servo?

- Category: RC cars › Servos
- Kind: Modern device
- Basis: Feetech FS90R datasheet (maker PDF, hosted by Pololu); Pololu spec table (secondary)
- Page: https://xemstudio.com/objects/feetech-fs90r-continuous-rotation-servo/ · JSON: https://xemstudio.com/api/geometry?object=feetech-fs90r-continuous-rotation-servo · Plain text: https://xemstudio.com/objects/feetech-fs90r-continuous-rotation-servo/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 | height |
|---|---|---|
| 22.5 | 12.1 | 27.7 |

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

## Notes

- The Feetech FS90R is a 9 g, 360° continuous-rotation micro servo. Feetech's datasheet gives its size as A 22.5 mm, B 12.1 mm, C 27.7 mm, a 21-tooth (4.86 mm) output spline, a 250 mm lead and 4.8–6 V.
- Feetech does not say in text which axis C is; it is taken as the overall height, the larger of the two published third dimensions, so the envelope encloses the body either way. Pololu's 23.4 mm likely leaves out the shaft boss — check yours before cutting a tight pocket.
- The file is an envelope box 22.5 × 12.1 × 27.7 mm at the published size, true size, no printing allowance. Mounting ears, output shaft and lead are not modelled.

## Sizes

| dimension | value |
|---|---|
| A (body length) | 22.5 mm |
| B (body width) | 12.1 mm |
| C | 27.7 mm (datasheet); Pololu lists 23.4 mm |
| weight | 9 g ± 0.2 |
| output spline | 21 T (4.86 mm) |
| lead | 250 mm ± 5 (datasheet); Pololu 10 in |
| voltage | 4.8–6 V |
| pulse range / stop | 700–2300 µs / 1500 µs |
| stall torque | 1.3 kg·cm (4.8 V), 1.5 kg·cm (6 V) |
| no-load speed | 80 rpm (4.8 V), 100 rpm (6 V) |
| mounting-ear span and holes | on the datasheet drawing only (not in text) |

## Where the files are

- Feetech (via Pololu): [FS90R datasheet (PDF)](https://www.pololu.com/file/0J1867/FS90R.pdf) — web — Publisher's page; dimensions are facts
- Pololu (retailer): [FS90R specs](https://www.pololu.com/product/2820/specs) — web — Publisher's page; dimensions are facts

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

Index: https://xemstudio.com/files/hardware/feetech-fs90r-continuous-rotation-servo/index.json

- feetech-fs90r-continuous-rotation-servo-envelope: [STEP](https://xemstudio.com/files/hardware/feetech-fs90r-continuous-rotation-servo/feetech-fs90r-continuous-rotation-servo-envelope.step) · [STL](https://xemstudio.com/files/hardware/feetech-fs90r-continuous-rotation-servo/feetech-fs90r-continuous-rotation-servo-envelope.stl) — An envelope box 22.5 × 12.1 × 27.7 mm (Mounting ears, output shaft and lead are not modelled)

## Questions

**How big is the FS90R?**

22.5 × 12.1 mm body; 27.7 mm third dimension on Feetech's datasheet (Pololu lists 23.4 mm). 9 g, 21-tooth spline.

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