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3325_0 42STH38 NEMA-17 Bipolar Stepper with 5.18:1

Product Code: 3325
Excl. VAT: £36.45 Incl. VAT: £43.74
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This bipolar stepper with a rear shaft and a planetary gearbox has a 0.35° step angle and 18 kg·cm of torque at low speeds. 

When connected to a 1067 - PhidgetStepper Bipolar HC, the 3325 has a maximum speed of approximately 900RPM.

This NEMA-17 motor has an integrated Planetary gearbox with a 52/11 :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 3325 has a maximum speed of approximately 900 RPM. At the output of the gearbox, the step angle is a little under 0.35°. When using the step angle in calculations, you should derive the exact step angle by dividing 1.8° by the gearbox reduction ratio.

At 1.7 Amps, this stepper motor can produce a maximum torque of 18.6 kg-cm. However, the gearbox is only rated for 18 kg-cm of continuous torque. Loading this gearbox stepper beyond the torque rating of the gearbox will shorten its useful life.


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.
Product Specifications


Motor Properties

Motor Type Bipolar Stepper
Manufacturer Part Number 42STH38-1684B / 36JXS60K5.18
Step Angle 0.35°
Step Accuracy ± 5 %
Holding Torque 18 kg·cm
Rated Torque 18 kg·cm
Maximum Speed (w/1067 Motor Controller) 904 RPM
Acceleration at Max Speed
(w/1067 Motor Controller)
410000 1/16 steps/sec²


Electrical Properties

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


Physical Properties

Shaft Diameter 8 mm
Rear Shaft Diameter 3.9 mm
Mounting Plate Size NEMA - 17
Weight 457 g
Number of Leads 4
Wire Length 300 mm


Gearbox Properties

Gearbox Type Planetary
Gear Ratio 5 211 : 1
Backlash Error 1 12°
Maximum Strength of Gears 18 kg·cm
Shaft Maximum Axial Load 49.1 N
Shaft Maximum Radial Load 98.1 N

Product Attachments

View File3325. 3329 Mechanical Drawings    Size: (44.81 KB)

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Whenever possible, items which are in stock are dispatched the same day, or the next working day.

Large and/or heavy items are dispatched by UPS courier service and these orders must be placed before 15:00hrs (GMT) to ensure same day dispatch.

Small items are normally sent using a Royal Mail service for UK orders, and International Airmail or UPS for overseas orders

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3325_0 42STH38 NEMA-17 Bipolar Stepper with 5.18:1