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

What are the NEMA 23 stepper motor dimensions? · 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.

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 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.

Sizes

featuremm
face56.4 × 56.4
hole pattern47.14 × 47.14
holes4 × Ø5.1 through
pilot bossØ38.1 × 1.6
shaftØ6.35 × 21, D-flat 5.71 across
body lengths drawn56, 76

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.

featureexactmates withfitfiles
pilot bossØ15 / 22 / 22 / 38.1 / 73mount pilot boreslidenema*
shaftØ4 / 5 / 5 / 6.35 / 14coupler or pulley boreslidenema*
mount holesM2 / M2.5 / M3 tapped, Ø5.1 / Ø5.5 throughmount screwsdesignednema*

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

WikipediaStepper motorwebCC BY-SA 4.0 (text)
NEMAICS 16 motion/position control motors and controlsPDFNEMA 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

nema23-56NEMA 23 envelope, 56 mm body, 47.14 mm hole pattern (Ø5.1 through), Ø6.35 shaftSTEP · STL
nema23-76NEMA 23 envelope, 76 mm body, 47.14 mm hole pattern (Ø5.1 through), Ø6.35 shaftSTEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=nema-23-stepper

NEMA 23 stepper motor: 56.4 mm face, 47.14 mm hole pattern, isometric render of a generated part
Render of nema23-56 from the free STEP; not to scale.

How it fits

Connects to

Flexible shaft couplers, 5–10 mm boresØ6.35 shaft into a coupler bore (slide)

Alternatives

NEMA 17 stepper motorNEMA 17 frameNEMA 34 stepper motorNEMA 34 frame

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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.