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NEMA 34 stepper motor: 86 mm face, 69.6 mm hole pattern

What are the NEMA 34 stepper motor dimensions? · Hardware · basis: NEMA ICS 16 frame size 34 (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 34 is a 3.4 in face: 86 mm square, with chamfered corners. The face and hole pattern are the standard; the body length is the maker's.
  • Four Ø5.5 through holes in the flange on a 69.6 mm square, for screws from the front.
  • Pilot boss Ø73 × 1.6; shaft Ø14 × 37 from the boss, D-flat 12.60 across.
  • Files: 80, 115 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
face86 × 86
hole pattern69.6 × 69.6
holes4 × Ø5.5 through
pilot bossØ73 × 1.6
shaftØ14 × 37, D-flat 12.60 across
body lengths drawn80, 115

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

nema34-80NEMA 34 envelope, 80 mm body, 69.6 mm hole pattern (Ø5.5 through), Ø14.0 shaftSTEP · STL
nema34-115NEMA 34 envelope, 115 mm body, 69.6 mm hole pattern (Ø5.5 through), Ø14.0 shaftSTEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=nema-34-stepper

NEMA 34 stepper motor: 86 mm face, 69.6 mm hole pattern, isometric render of a generated part
Render of nema34-80 from the free STEP; not to scale.

How it fits

Alternatives

NEMA 23 stepper motorNEMA 23 frameNEMA 17 stepper motorNEMA 17 frame

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Questions

What is the NEMA 34 hole pattern?

4 × Ø5.5 through on a 69.6 × 69.6 mm square, on a 86 mm face.

What is the NEMA 34 shaft size?

Ø14 mm as commonly supplied (37 mm out from the Ø73 pilot boss), D-flat 12.60 across.

How long is a NEMA 34 stepper?

The standard fixes the face, not the length. Common bodies: 80, 115 mm; longer bodies give more torque.