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SKU 193327

3327 - 42STH38 NEMA-17 Bipolar Stepper with 26.85:1 Gearbox

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Original price €68,48 - Original price €68,48
Original price
€68,48 - €68,48
Current price €68,48

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This NEMA-17 motor has an integrated Planetary gearbox with a 26 103 / 121 :1 ratio. It comes with the rear shaft exposed, so you can mount an encoder or shaft coupler .

At 1.7 Amps (maximum current), this stepper motor can produce a maximum torque of 77 kg-cm. However, the gearbox is only rated for 30 kg-cm of continuous torque, and 80 kg-cm for brief overloads. Loading this gearbox stepper beyond the torque rating of the gearbox will shorten its useful life.

When connected to a 1067 - PhidgetStepper Bipolar HC, the 3327 has a maximum speed of approximately 23 RPM at no load. At the output of the gearbox, the step angle is a little under 0.07°. When using the step angle in calculations, you should derive the exact step angle by dividing 1.8° by the gearbox reduction ratio.

Motor Controller and Connection

The 3327 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 TO B C D

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


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.

Product Features

  • High Torque
  • 0.067° Step Angle
  • Motor can produces 30 kg-cm holding torque @ 1.7A
  • NEMA-17 Bipolar 4-wire
  • Rear shaft exposed for compatibility with encoders
Product Specifications

Motor Properties

Motor Type Bipolar Stepper
Manufacturer Part Number 42STH38-1684B / 36JXS60K26
Step Angle 0.067°
Step Accuracy 5 %
Holding Torque 30 kg·cm
Rated Torque 30 kg·cm
Maximum Speed ​​(w/1063 Motor Controller) 21 RPM
Maximum Speed ​​(w/1067 Motor Controller) 174 RPM
Acceleration at Max Speed
(w/1067 Motor Controller)
600000 1/16 steps/sec²

Electrical Properties

Recommended Voltage 12V DC
Rated Current 1.7 A
Coil Resistance 1.7 Ω

Physical Properties

Shaft Diameter 8 mm
Rear Shaft Diameter 3.8mm
Mounting Plate Size NEMA - 17
Weight 503 g
Number of Leads 4
Wire Length 300 mm

Gearbox Properties

Gearbox Type Planetary
Gear Ratio 26 103121 : 1
Backlash Error 1 12 °
Maximum Strength of Gears 30 kg·cm
Shaft Maximum Axial Load 49.1 No
Shaft Maximum Radial Load 98.1 No