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NEMA 17 Stepper Motor - 40mm, 50N-cm / 70oz-in

NEMA 17 Stepper Motor - 40mm, 50N-cm / 70oz-in

These are the stepper motors we use in the extruder of our i3 printer kits. At 40mm deep they're fairly compact, but provide enough torque for direct-drive / bowden style extruders.

The motor's shaft has been ground flat, making it easy to get a good grip with a pulley, drive gear - or anything that uses a grub screw, really.

Another handy feature of these motors is their detachable leads - this makes installation a breeze, and it's easy to redo your wiring later if you'd like. We've had the included cables customised to plug straight into a RAMPS board, so installation of these motors is literally plug-and-play!

These motors provide a mighty 50N-cm (70oz-in) of torque while running at 1.5A! Heaps of power without stressing out your stepper driver - perfect!

We recommend these motors for geared / direct-drive / bowden extruders - they provide enough torque to handle nearly anything. They'd also be suitable as axis motors for delta-style 3D printers, where high-torque is a necessity. If you're looking for a motor for X/Y/Z motion in a cartesian printer, check out our lighter 34mm steppers - they should do the job without a problem!


  • Step Angle: 1.8
  • No. of Phases: 2
  • Insulation Resistance: 100MΩmin (500V DC)
  • Insulation Class: B
  • Rotor Inertia: 57g. cm2
  • Mass: 240g
  • Depth: 40mm
  • Rated Voltage: 3.75V
  • Rated Current: 1.5A
  • Resistance / Phase: 2.5Ω ± 10%
  • Induction / Phase: 5.0mH ± 20%
  • Holding Torque: 50N-cm / 70oz-in
  • Detent Torque: 15N-cm
  • Cable Length: 70cm
  • Cable Connector: 4pin Dupont (RAMPS Compatible)

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  • Product Code: STEPPER-40mm
  • Availability: In Stock
  • $24.95
  • Ex Tax: $22.68