3331_0 57STH56 NEMA-23 Bipolar Gearless Stepper

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This NEMA-23 motor generates 12.6 kg-cm of holding torque at 2.8 Amps. It comes with the rear shaft exposed, so you can mount an encoder or shaft coupler.

57STH56 NEMA-23 Bipolar Gearless Stepper
57STH56 NEMA-23 Bipolar Gearless Stepper

The 3331 stepper motor connects to a bipolar motor controller such as the 1067 - PhidgetStepper Bipolar HC.

The following table shows how to connect the motor wires to the board connectors to produce a clockwise rotation in the stepper motor when increasing position. To wire for counter-clockwise rotation when increasing position, reverse the red and blue wires.


Wire Color Black Green Red Blue
Board Connector A B C D

Note: Make sure to unplug the power cord from the motor controller before switching wires around.

The rear shaft of this motor can be equipped with the HKT22 Optical Encoder for applications where you need to keep track of the exact position, velocity, or acceleration of the motor.


warning Connecting the motor directly to a power supply will destroy the motor and void the warranty. If you want to check your motor make sure it is connected to a constant current / chopper drive controller.

Motor Properties

Motor Type Bipolar Stepper
Manufacturer Part Number 57STH56-2804B
Step Angle 1.8°
Step Accuracy ± 5 %
Holding Torque 12.6 kg·cm
Rated Torque 11 kg·cm
Maximum Speed (w/1067 Motor Controller) 3000 RPM
Acceleration at Max Speed
(w/1067 Motor Controller)
300000 1/16 steps/sec²


Electrical Properties

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


Physical Properties

Shaft Diameter 6.4 mm
Rear Shaft Diameter 3.9 mm
Mounting Plate Size NEMA - 23
Weight 686 g
Number of Leads 4
Wire Length

300 mm

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