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3330_0 57STH56 NEMA 23 Bipolar Precision Gearless Stepper


This NEMA-23 motor generates 12 kg-cm of torque at 2.8 Amps.

 It comes with the rear shaft exposed, so you can mount an encoder or shaft coupler.

This motor is particulary suited for precision applications due to its 0.9° step angle.

  • High Precision, Good Speed
  • 0.9° Step Angle
  • Motor can produce 12 kg-cm holding torque @ 2.8A
  • NEMA-23 Bipolar 4-wire
  • Rear shaft exposed for compatibility with encoders

Motor Properties

Motor Type Bipolar Stepper
Manufacturer Part Number 57STH56-2804MB
Step Angle 0.9°
Step Accuracy 5 %
Holding Torque 12 kg·cm
Rated Torque 11.2 kg·cm
Maximum Speed (w/1063 Motor Controller) 208 RPM
Maximum Speed (w/1067 Motor Controller) 2250 RPM
Acceleration at Max Speed
(w/1067 Motor Controller)
800000 1/16 steps/sec²


Electrical Properties

Recommended Voltage 12 V DC
Rated Current 2.8 A
Coil Resistance 900 mΩ


Physical Properties

Shaft Diameter 14
Rear Shaft Diameter 3.9 mm
Mounting Plate Size NEMA - 23
Weight 695 g
Number of Leads 4
Wire Length 300 mm