# Pololu 30:1 Micro Metal Gearmotor HPCB 6V, extended motor shaft (#3072): body, D-shaft and M1.6 face holes

> What are the Pololu 30:1 Micro Metal Gearmotor (#3072) dimensions, shaft and mounting holes?

- Category: Electronic components › Motors
- Kind: Modern device
- Basis: Pololu's micro metal gearmotor 3D STEP models (extended-shaft carbon-brush version), checked against the Pololu #3072 product page and the micro metal gearmotor dimension diagram.
- Page: https://xemstudio.com/objects/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/ · JSON: https://xemstudio.com/api/geometry?object=pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft · Plain text: https://xemstudio.com/objects/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/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 |
|---|---|---|
| 40.3 | 12.0 | 10.0 |

**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

- Axis along the length; 0 is the tip of the extended rear motor shaft. Cross-section 12.0 × 10.0 (Ø12 can with two flats).
- Motor can and back cap 15.4 long, gearbox 9.0 long; the gearbox output face is 30.3 from the rear shaft tip.
- Output: Ø3.0 D-shaft (0.5 deep flat) reaching 10.0 past the gearbox face, with a Ø4.0 bushing 0.72 proud of the face.
- Two M1.6 threaded holes in the gearbox output face, diagonal pair at (±3.80, ±2.80) from the shaft axis.
- Rear: Ø1.0 extended motor shaft, about 4.5 past the motor for an encoder; HPCB terminals 6.3 apart. The same body applies to every HPCB/HP/MP ratio except 1000:1.
- All dimensions are exact nominal millimetres, true size, with no tolerance added.

## 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 |
|---|---|---|---|---|
| Output D-shaft | Ø3.0 with 0.5 deep flat, 10.0 long from the gearbox face | Pololu wheel or hub with a 3 mm D bore | press | all |
| Gearbox face holes | 2 × M1.6 on a (±3.80, ±2.80) diagonal | face-mount bracket with M1.6 screws | designed | all |
| Body cross-section | 12.0 × 10.0 (Ø12 can with flats) | clamp-style micro gearmotor bracket | clamp | all |

## Where the files are

- Pololu: [30:1 Micro Metal Gearmotor HPCB 6V with Extended Motor Shaft (#3072)](https://www.pololu.com/product/3072) — web — Publisher's page; dimensions are facts
- Pololu: [Micro metal gearmotor dimension diagram (PDF)](https://www.pololu.com/file/0J949/micro-metal-gearmotors-dimensions.pdf) — web — Publisher's page; dimensions are facts
- Pololu: [Micro metal gearmotor 3D STEP models](https://www.pololu.com/file/0J2042/) — web — Publisher's page; dimensions are facts

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

Index: https://xemstudio.com/files/hardware/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/index.json

- pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft: [STEP](https://xemstudio.com/files/hardware/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft.step) · [STL](https://xemstudio.com/files/hardware/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft.stl) — Pololu 30:1 Micro Metal Gearmotor HPCB 6V, extended motor shaft (#3072): body, D-shaft and M1.6 face holes

## Questions

**How big is a Pololu micro metal gearmotor?**

12.0 × 10.0 mm in cross-section; #3072 with extended motor shaft is 40.3 mm from rear shaft tip to output shaft tip.

**What shaft does the Pololu #3072 have?**

A Ø3.0 mm D-shaft with a 0.5 mm deep flat, reaching 10.0 mm past the gearbox face.

**Where are the micro metal gearmotor mounting holes?**

Two M1.6 threaded holes in the gearbox output face, a diagonal pair at (±3.80, ±2.80) mm from the shaft axis.

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- [130 size brushed DC motor: Ø20.1 / 15.1 × 25.0 mm, Ø2 shaft](https://xemstudio.com/objects/dc-motor-130-size/)
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