# NEMA 17 stepper motor

> What are the NEMA 17 mounting dimensions?

- Category: Hardware › Motion
- Kind: Standard part
- Basis: NEMA ICS 16 frame standard; common vendor values
- Page: https://xemstudio.com/objects/nema-17-stepper/ · JSON: https://xemstudio.com/api/geometry?object=nema-17-stepper · Plain text: https://xemstudio.com/objects/nema-17-stepper/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

## Overall (mm)

| width | height |
|---|---|
| 42.3 | 42.3 |

Mounting holes: 4 × Ø3.0 mm, pattern 31 x 31 mm, M3

## Notes

- Face 42.3 × 42.3 mm; four M3 holes on a 31.0 × 31.0 mm pattern; Ø22 mm pilot boss, 2 mm tall; Ø5 mm shaft with a D-flat, typically 20–24 mm long.
- Body length varies by torque (20–60 mm); the face and hole pattern don't.

## Where the files are

- Wikipedia: [Stepper motor (NEMA frame sizes)](https://en.wikipedia.org/wiki/Stepper_motor) — web — CC BY-SA 4.0 (text)

## Free STEP/STL (3 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/nema-17-stepper/index.json

- nema17-34: [STEP](https://xemstudio.com/files/hardware/nema-17-stepper/nema17-34.step) · [STL](https://xemstudio.com/files/hardware/nema-17-stepper/nema17-34.stl) — NEMA 17 envelope, 34 mm body, 31 mm M3 pattern, Ø5 D-shaft
- nema17-40: [STEP](https://xemstudio.com/files/hardware/nema-17-stepper/nema17-40.step) · [STL](https://xemstudio.com/files/hardware/nema-17-stepper/nema17-40.stl) — NEMA 17 envelope, 40 mm body, 31 mm M3 pattern, Ø5 D-shaft
- nema17-48: [STEP](https://xemstudio.com/files/hardware/nema-17-stepper/nema17-48.step) · [STL](https://xemstudio.com/files/hardware/nema-17-stepper/nema17-48.stl) — NEMA 17 envelope, 48 mm body, 31 mm M3 pattern, Ø5 D-shaft

## Questions

**What is the NEMA 17 mounting hole pattern?**

Four M3 holes on a 31.0 × 31.0 mm square, 42.3 mm face, Ø22 mm pilot boss 2 mm tall.

**What is the NEMA 17 shaft diameter?**

5 mm with a D-flat, usually 20–24 mm long. Body length 20–60 mm depending on torque; the face never changes.

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