193329 3329 - 42STH38 NEMA-17 Bipolar Stepper with 99.51:1 Gearbox

3329 - 42STH38 NEMA-17 Bipolar Stepper with 99.51:1 Gearbox

This bipolar stepper with a rear shaft and a planetary gearbox has a 0.018° step angle and 48 kg·cm of torque at low speeds.
Prezzi IVA inclusa
€ 74,71 Prezzo
€ 61,24 + VAT



This NEMA-17 motor has an integrated Planetary gearbox with a 991044/2057 :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 3329 has a maximum speed of 34 RPM. At the output of the gearbox, the step angle is approximately 0.018°. 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 gearbox stepper can produce a maximum torque of 250 kg-cm. However, the gearbox is only rated for 48 kg-cm of continuous torque, and 100 kg-cm for brief overloads. Loading this gearbox stepper beyond the torque rating of the gearbox will shorten its useful life.

The 3329 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.

Motor Properties

Motor Type Bipolar Stepper
Manufacturer Part Number 42STH38-1684B / 36JXS60K99.51
Step Angle 0.018°
Step Accuracy ± 5 %
Holding Torque 48 kg·cm
Rated Torque 48 kg·cm
Maximum Speed (w/1067 Motor Controller) 34 RPM
Acceleration at Max Speed 
(w/1067 Motor Controller)
1.2E+06 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 564 g
Number of Leads 4
Wire Length 300 mm


Gearbox Properties

Gearbox Type Planetary
Gear Ratio 99 10442057 : 1
Backlash Error 12°
Maximum Strength of Gears 48 kg·cm
Shaft Maximum Axial Load 49.1 N
Shaft Maximum Radial Load 98.1 N


Part. No. : 3329
NEMA : 17
WINDING : Bipolar
Diam. Asse mm : 8

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Questions on 3329 - 42STH38 NEMA-17 Bipolar Stepper with 99.51:1 Gearbox

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  • 11/03/19 16.10 Buongiorno. E' possibile avere lo schema del circuito del motore? Devo capire qual è l'ordine dei fili per il collegamento con un Pololu A4988 .
    • Salve,
      non abbiamo documentazione oltre a quella che trova sul sito. Puo' semplicemente misurare la resistenza dei fili a coppie per determinare come sono collegati. Grazie
    • Do you find this question helpful?  Si   No
  • 11/03/19 17.49 La velocità indicata di 34 RPM è riferita al motore senza gearbox o al gearbox?
    • Salve, si riferisce alla velocita' max del riduttore: When connected to a 1067 - PhidgetStepper Bipolar HC, the 3329 has a maximum speed of 34 RPM. At the output of the gearbox ....
    • Do you find this question helpful?  Si   No
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  1. 3531 - Optical Rotary Encoder HKT22

    193531 3531 - Optical Rotary Encoder HKT22

    This low-cost encoder is designed to fit on the rear shaft of our stepper motors. Measure the rotation of your motor even whefalse
    Tasse escluse:
    € 31,02
    IVA inclusa:
    € 37,84