Xem Studiomeasured geometryLibrary › Electronics › Motors ·
NEMA 11 stepper motor: 28.2 mm face, 23 mm hole pattern
What are the NEMA 11 stepper motor dimensions? · Hardware · basis: NEMA ICS 16 frame size 11 (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.
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. Mating features
- sizes
- 6 in table
Notes
- Envelope only: the outside of the motor. The windings, rotor and bearings inside are not drawn.
- NEMA 11 is a 1.1 in face: 28.2 mm square, with chamfered corners. The face and hole pattern are the standard; the body length is the maker's.
- Four M2.5 tapped holes on a 23 mm square, drawn as plain bores at the thread's major diameter (Ø2.5) 8 mm deep.
- Pilot boss Ø22 × 2; shaft Ø5 × 20 from the boss, D-flat 4.50 across.
- Files: 32, 45 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.
Sizes
| feature | mm |
|---|---|
| face | 28.2 × 28.2 |
| hole pattern | 23 × 23 |
| holes | 4 × M2.5 tapped |
| pilot boss | Ø22 × 2 |
| shaft | Ø5 × 20, D-flat 4.50 across |
| body lengths drawn | 32, 45 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits 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* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Stepper motor | web | CC BY-SA 4.0 (text) |
| NEMA | ICS 16 motion/position control motors and controls | NEMA standard, purchase |
Free files
★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| nema11-32 | NEMA 11 envelope, 32 mm body, 23.0 mm hole pattern (M2.5 tapped), Ø5.0 shaft | STEP · STL |
| nema11-45 | NEMA 11 envelope, 45 mm body, 23.0 mm hole pattern (M2.5 tapped), Ø5.0 shaft | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=nema-11-stepper
Questions
What is the NEMA 11 hole pattern?
4 × M2.5 tapped on a 23 × 23 mm square, on a 28.2 mm face.
What is the NEMA 11 shaft size?
Ø5 mm as commonly supplied (20 mm out from the Ø22 pilot boss), D-flat 4.50 across.
How long is a NEMA 11 stepper?
The standard fixes the face, not the length. Common bodies: 32, 45 mm; longer bodies give more torque.