# RC servo sizes: 9 g micro (SG90, MG90S), standard (Futaba S3003, Hitec HS-311), 1/4 scale (HS-805BB)

> What are the dimensions of a standard RC servo?

- Category: Electronics › RC & drones
- Kind: Modern device
- Basis: Servo datasheets and maker / retailer spec pages
- Page: https://xemstudio.com/objects/rc-servos/ · JSON: https://xemstudio.com/api/geometry?object=rc-servos · Plain text: https://xemstudio.com/objects/rc-servos/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- 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

- Micro 9 g: SG90 about 22.2 × 11.8 × 31; MG90S 22.8 × 12.2 × 28.5 (13.4 g).
- Standard: Futaba S3003 40–41 × 20 × 36 (37 g); Hitec HS-311 39.9 × 19.8 × 36.3 (42.8 g), 24-tooth spline. Quarter scale: Hitec HS-805BB 66 × 30 × 57.6 (152 g).
- Mounting-tab hole spacing, tab hole size and most spline tooth counts are not published as text for these servos: measure the tabs, or design the cut-out around the body envelope and fix with the supplied screws.
- Body envelopes (free STEP/STL) are for pockets and cut-outs; add 0.3 mm a side.

## Sizes

| servo | class | length_mm | width_mm | height_mm | weight_g | spline |
|---|---|---|---|---|---|---|
| SG90 | micro 9 g | 22.2 | 11.8 | 31.0 | 9 | None |
| TowerPro MG90S | micro | 22.8 | 12.2 | 28.5 | 13.4 | None |
| Futaba S3003 | standard | 40–41 | 20 | 36 | 37 | None |
| Hitec HS-311 | standard | 39.9 | 19.8 | 36.3 | 42.8 | 24T |
| Hitec HS-805BB | 1/4 scale | 66 | 30 | 57.6 | 152 | heavy-duty |

## Where the files are

- SG90 datasheet (TowerPro): [SG90 micro servo](https://tams.informatik.uni-hamburg.de/lehre/2023ss/vorlesung/es/doc/sg90.pdf) — web — Publisher's page; dimensions are facts
- GetFPV (TowerPro spec): [MG90S](https://www.getfpv.com/towerpro-mg90s-digital-servo.html) — web — Publisher's page; dimensions are facts
- Futaba S3003 datasheet: [S3003 standard servo](https://content.instructables.com/F1V/HY29/IR9E9N75/F1VHY29IR9E9N75.pdf) — web — Publisher's page; dimensions are facts
- ServoDatabase: [Hitec HS-311](https://servodatabase.com/servo/hitec/hs-311) — web — Publisher's page; dimensions are facts
- SparkFun (Hitec spec): [HS-805BB giant scale](https://www.sparkfun.com/servo-hitec-hs-805bb-giant-scale.html) — web — Publisher's page; dimensions are facts

## Free STEP/STL (5 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/rc-servos/index.json

- servo-body-sg90-micro: [STEP](https://xemstudio.com/files/hardware/rc-servos/servo-body-sg90-micro.step) · [STL](https://xemstudio.com/files/hardware/rc-servos/servo-body-sg90-micro.stl) — Servo body envelope 22.2 × 11.8 × 31.0 mm (tabs and output not modelled)
- servo-body-mg90s-micro: [STEP](https://xemstudio.com/files/hardware/rc-servos/servo-body-mg90s-micro.step) · [STL](https://xemstudio.com/files/hardware/rc-servos/servo-body-mg90s-micro.stl) — Servo body envelope 22.8 × 12.2 × 28.5 mm (tabs and output not modelled)
- servo-body-standard-40x20x36: [STEP](https://xemstudio.com/files/hardware/rc-servos/servo-body-standard-40x20x36.step) · [STL](https://xemstudio.com/files/hardware/rc-servos/servo-body-standard-40x20x36.stl) — Servo body envelope 40.0 × 20.0 × 36.0 mm (tabs and output not modelled)
- servo-body-hs-311-standard: [STEP](https://xemstudio.com/files/hardware/rc-servos/servo-body-hs-311-standard.step) · [STL](https://xemstudio.com/files/hardware/rc-servos/servo-body-hs-311-standard.stl) — Servo body envelope 39.9 × 19.8 × 36.3 mm (tabs and output not modelled)
- servo-body-quarter-scale-66x30x57.6: [STEP](https://xemstudio.com/files/hardware/rc-servos/servo-body-quarter-scale-66x30x57.6.step) · [STL](https://xemstudio.com/files/hardware/rc-servos/servo-body-quarter-scale-66x30x57.6.stl) — Servo body envelope 66.0 × 30.0 × 57.6 mm (tabs and output not modelled)

## Questions

**How big is an SG90 servo?**

About 22.2 × 11.8 × 31 mm, 9 g.

**How big is a standard servo?**

About 40 × 20 × 36 mm (Futaba S3003, Hitec HS-311).

## Fits with

- [Flight controller and ESC stack sizes: 30.5×30.5 M3, 20×20, 25.5 / 26 whoop, 16×16 nano, wing FCs, Pixhawk](https://xemstudio.com/objects/fc-esc-stack-mounts/)
- [RC plane outrunners (2212, 2216, 2826, 3508, 4110, 6374) and car inrunners (540 / 3650, 4274, 1/8 scale)](https://xemstudio.com/objects/rc-plane-and-car-motors/)