• Bipolar Stepper with 77:1 Gearbox (57STH56 NEMA-23)

This NEMA-23 motor has an integrated Planetary gearbox with a 76 49/64 :1 ratio. It comes with the rear shaft exposed, so you can mount an encoder or shaft coupler.

When connected to a 1067 - PhidgetStepper Bipolar HC, the 3333 has a maximum speed of 116 RPM. At the output of the gearbox, the step angle is approximately 0.12°. When using the step angle in calculations, you should derive the exact step angle by dividing 1.8° by the gearbox reduction ratio.

At 2.8 Amps, this stepper motor can produce a maximum torque of 960 kg-cm. However, the gearbox is only rated for 240 kg-cm of continuous torque. Loading this gearbox stepper beyond the torque rating of the gearbox will shorten its useful life.

Product Specifications

Motor Properties
Motor Type Bipolar Stepper
Manufacturer Part Number 57STH56-2804B / 56JXS300K77
Step Angle 0.023°
Step Accuracy ± 5 %
Holding Torque 240 kg·cm
Rated Torque 240 kg·cm
Maximum Motor Speed 25 RPM
Electrical Properties
Recommended Voltage 12 V DC
Rated Current 2.8 A
Coil Resistance 900 mΩ
Phase Inductance 2.5 mH
Physical Properties
Shaft Diameter 12 mm
Rear Shaft Diameter 3.9 mm
Mounting Plate Size NEMA - 23
Weight 1.5 kg
Number of Leads 4
Wire Length 300 mm
Gearbox Properties
Gearbox Type Planetary
Gear Ratio 76 4964 : 1
Backlash Error 1 12°
Maximum Strength of Gears 240 kg·cm
Shaft Maximum Axial Load 100 N
Shaft Maximum Radial Load 250 N

Mechanical Drawing

More information to be found in the Stepper User Guide


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Bipolar Stepper with 77:1 Gearbox (57STH56 NEMA-23)

  • Brand: Phidgets
  • Product Code: 3334_0
  • Availability: In Stock
  • 98.01€

  • Ex Tax: 81.00€