# Corona DS-939MG digital metal-gear micro servo

> What are the dimensions of the Corona DS-939MG digital metal-gear micro servo?

- Category: RC planes › Micro servos
- Kind: Modern device
- Basis: Secondary source: ServoDatabase.com (copy of the maker's figures; the maker publishes none directly)
- Page: https://xemstudio.com/objects/corona-ds-939mg-servo/ · JSON: https://xemstudio.com/api/geometry?object=corona-ds-939mg-servo · Plain text: https://xemstudio.com/objects/corona-ds-939mg-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 | 11.51 | 24.61 |

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

## Notes

- Servo Database listing in inches (secondary), converted to mm.
- 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 |
|---|---|
| Length | 0.886 in (22.5 mm) |
| Width | 0.453 in (11.51 mm) |
| Height | 0.969 in (24.61 mm) |
| Weight | 0.44 oz |
| Torque | 34.73 oz-in at 4.8 V; 37.51 oz-in at 6.0 V |
| Speed | 0.14 s/60° at 4.8 V; 0.13 at 6.0 V |
| Gears | metal |
| Spline | 21T |
| Bearing | single |

## Where the files are

- ServoDatabase.com: [Corona DS-939MG](https://servodatabase.com/servo/corona/ds-939mg) — web — Publisher's page; dimensions are facts

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

Index: https://xemstudio.com/files/hardware/corona-ds-939mg-servo/index.json

- corona-ds-939mg-servo-envelope: [STEP](https://xemstudio.com/files/hardware/corona-ds-939mg-servo/corona-ds-939mg-servo-envelope.step) · [STL](https://xemstudio.com/files/hardware/corona-ds-939mg-servo/corona-ds-939mg-servo-envelope.stl) — Envelope 22.5 × 11.51 × 24.61 mm (Servo case L × W × H exactly as the maker lists it; the listing does not say whether mounting tabs or the output shaft are included)

## Questions

**What spline does the DS-939MG use?**

21T.

## Fits with

- [RC servo sizes: 9 g micro (SG90, MG90S), standard (Futaba S3003, Hitec HS-311), 1/4 scale (HS-805BB)](https://xemstudio.com/objects/rc-servos/)
- [TowerPro SG90 micro servo](https://xemstudio.com/objects/towerpro-sg90-micro-servo/)
- [Emax ES08MA II 12 g metal-gear micro servo](https://xemstudio.com/objects/emax-es08ma-ii-servo/)
- [Emax ES9051 4.3 g digital servo](https://xemstudio.com/objects/emax-es9051-servo/)
- [Hitec HS-55 sub-micro feather servo](https://xemstudio.com/objects/hitec-hs-55-servo/)
- [Hitec HS-65HB Karbonite micro servo](https://xemstudio.com/objects/hitec-hs-65hb-servo/)