# NEMA 23 stepper motor: 56.4 mm face, 47.14 mm hole pattern

> What are the NEMA 23 stepper motor dimensions?

- Category: Electronics › Motors
- Kind: Hardware
- Basis: NEMA ICS 16 frame size 23 (face and mounting-hole pattern); pilot boss and shaft as commonly supplied; body length varies with torque. Envelope only: the outside of the motor. The windings, rotor and bearings inside are not drawn.
- Page: https://xemstudio.com/objects/nema-23-stepper/ · JSON: https://xemstudio.com/api/geometry?object=nema-23-stepper · Plain text: https://xemstudio.com/objects/nema-23-stepper/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.** Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part.

## Notes

- Envelope only: the outside of the motor. The windings, rotor and bearings inside are not drawn.
- NEMA 23 is a 2.3 in face: 56.4 mm square, with chamfered corners. The face and hole pattern are the standard; the body length is the maker's.
- Four Ø5.1 through holes in the flange on a 47.14 mm square, for screws from the front.
- Pilot boss Ø38.1 × 1.6; shaft Ø6.35 × 21 from the boss, D-flat 5.71 across.
- Files: 56, 76 mm bodies. Leads and connector are not drawn.
- In DIY Stirling builds, a stepper turned by the engine is used as a two-phase generator; each coil pair gives AC that is rectified for a load.

## 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 |
|---|---|---|---|---|
| pilot boss | Ø15 / 22 / 22 / 38.1 / 73 | mount pilot bore | slide | nema* |
| shaft | Ø4 / 5 / 5 / 6.35 / 14 | coupler or pulley bore | slide | nema* |
| mount holes | M2 / M2.5 / M3 tapped, Ø5.1 / Ø5.5 through | mount screws | designed | nema* |

## Sizes

| feature | mm |
|---|---|
| face | 56.4 × 56.4 |
| hole pattern | 47.14 × 47.14 |
| holes | 4 × Ø5.1 through |
| pilot boss | Ø38.1 × 1.6 |
| shaft | Ø6.35 × 21, D-flat 5.71 across |
| body lengths drawn | 56, 76 |

## Where the files are

- Wikipedia: [Stepper motor](https://en.wikipedia.org/wiki/Stepper_motor) — web — CC BY-SA 4.0 (text)
- NEMA: [ICS 16 motion/position control motors and controls](https://www.nema.org/standards/view/motion-position-control-motors-controls-and-feedback-devices) — PDF — NEMA standard, purchase

## Free STEP/STL (2 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/nema-23-stepper/index.json

- nema23-56: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-56.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-56.stl) — NEMA 23 envelope, 56 mm body, 47.14 mm hole pattern (Ø5.1 through), Ø6.35 shaft
- nema23-76: [STEP](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-76.step) · [STL](https://xemstudio.com/files/hardware/nema-steppers-8-to-34/nema23-76.stl) — NEMA 23 envelope, 76 mm body, 47.14 mm hole pattern (Ø5.1 through), Ø6.35 shaft

## How it fits

### Connects to
- [Flexible shaft couplers, 5–10 mm bores](https://xemstudio.com/objects/shaft-couplers/): Ø6.35 shaft into a coupler bore (slide)

### Alternatives
- [NEMA 17 stepper motor](https://xemstudio.com/objects/nema-17-stepper/): NEMA 17 frame
- [NEMA 34 stepper motor: 86 mm face, 69.6 mm hole pattern](https://xemstudio.com/objects/nema-34-stepper/): NEMA 34 frame

## Questions

**What is the NEMA 23 hole pattern?**

4 × Ø5.1 through on a 47.14 × 47.14 mm square, on a 56.4 mm face.

**What is the NEMA 23 shaft size?**

Ø6.35 mm as commonly supplied (21 mm out from the Ø38.1 pilot boss), D-flat 5.71 across.

**How long is a NEMA 23 stepper?**

The standard fixes the face, not the length. Common bodies: 56, 76 mm; longer bodies give more torque.

## Fits with

- [NEMA 17 stepper motor](https://xemstudio.com/objects/nema-17-stepper/)
- [NEMA 34 stepper motor: 86 mm face, 69.6 mm hole pattern](https://xemstudio.com/objects/nema-34-stepper/)
- [Flexible shaft couplers, 5–10 mm bores](https://xemstudio.com/objects/shaft-couplers/)
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/)
- [GT2 timing pulleys, 16T–60T (2 mm pitch)](https://xemstudio.com/objects/gt2-pulleys/)