# ROBOTIS Dynamixel AX-12A servo: 32 × 50 mm body, horn holes and frame-mount holes

> What are the Dynamixel AX-12A dimensions, horn and frame-mount hole positions?

- Category: Electronic components › Motors
- Kind: Modern device
- Basis: ROBOTIS e-Manual AX-12A dimension drawing.
- Page: https://xemstudio.com/objects/robotis-dynamixel-ax-12a/ · JSON: https://xemstudio.com/api/geometry?object=robotis-dynamixel-ax-12a · Plain text: https://xemstudio.com/objects/robotis-dynamixel-ax-12a/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 |
|---|---|---|
| 50.0 | 37.0 | 32.0 |

**Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part.

## Notes

- Datum: bottom on z=0, centred on X, body y=−16..+16; horn on the −Y face, its axis at z=38.5 (11.5 below the top).
- Body 32 × 32 × 50; horn Ø22 standing 5 proud of the front face (modelled depth 37).
- Horn: 4 × M2 tapped holes on a Ø16 circle, modelled as Ø1.6 × 4.0 deep.
- Frame holes for M2 bolts (modelled Ø2.2 × 5.0, front face): two columns 27 apart at z=32, 24, 16, 8 (8 pitch), plus a pair 16 apart at z=2.5.
- Not modelled: the narrowing of the upper body to 26 wide, the 3 mm front boss and the rear hinge bosses (overall depth 40 with them).
- Exact nominal mm.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| Horn | Ø22, 4 × M2 on Ø16 circle | horn-mounted bracket or link | designed | all |
| Frame holes | M2, columns 27 apart, 8 pitch | ROBOTIS frame or custom side bracket | designed | all |

## Sizes

| holes | x (mm) | z (mm) | size |
|---|---|---|---|
| horn | 0 / ±8 | 46.5, 30.5 / 38.5 | 4 × M2 on Ø16 |
| frame columns | ±13.5 | 32, 24, 16, 8 | 8 × M2 |
| frame bottom pair | ±8 | 2.5 | 2 × M2 |

## Where the files are

- ROBOTIS: [AX-12/AX-12A e-Manual](https://emanual.robotis.com/docs/en/dxl/ax/ax-12a/) — web — Publisher's page; dimensions are facts
- ROBOTIS (GitHub): [AX-12A dimension drawing](https://raw.githubusercontent.com/ROBOTIS-GIT/emanual/master/assets/images/dxl/ax/ax-12a_dimension.png) — web — Publisher's page; dimensions are facts

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

Index: https://xemstudio.com/files/hardware/robotis-dynamixel-ax-12a/index.json

- robotis-dynamixel-ax-12a: [STEP](https://xemstudio.com/files/hardware/robotis-dynamixel-ax-12a/robotis-dynamixel-ax-12a.step) · [STL](https://xemstudio.com/files/hardware/robotis-dynamixel-ax-12a/robotis-dynamixel-ax-12a.stl) — ROBOTIS Dynamixel AX-12A servo: 32 × 50 mm body, horn holes and frame-mount holes

## Questions

**How big is the AX-12A?**

32 × 50 mm body, 32 mm deep plus a 5 mm horn; 40 mm overall depth including rear bosses.

**What are the horn holes?**

Four M2 tapped holes on a Ø16 mm circle around the horn axis, 11.5 mm below the top.

**What is the side frame-hole pattern?**

M2 holes in two columns 27 mm apart at 8 mm pitch, plus a bottom pair 16 mm apart.

## Fits with

- [TowerPro MG996R servo](https://xemstudio.com/objects/towerpro-mg996r-servo/)
- [TowerPro SG90 micro servo](https://xemstudio.com/objects/towerpro-sg90-micro-servo/)
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- [Hex nuts, M2–M8 (ISO 4032)](https://xemstudio.com/objects/hex-nuts-metric/)