JK42HS40-1204AF-02 NEMA17 4.2 kg-cm Stepper Motor – D-Type Shaft

(11 customer reviews)

In stock

SKU: 51732
  1. Step Angle: 1.8 °
  2. Current: 1.2 A/Phase
  3. Holding Torque: 4.2 kg-cm
  4. Detent torque: 2.2 N.cm (Maximum)
  5. Lead Wires: 4
  6. Shaft diameter: 5 mm


(Including GST)

In stock

Select below products to add together

EasyMech Aluminum NEMA17 Shaft Coupling 5mm X 8mm ₹ 90
EasyMech Bracket for NEMA 17 Stepper Motor - BEND ₹ 199
EasyMech Bracket For NEMA 17 Stepper Motor - STRAIGHT ₹ 168
EasyMech NEMA17 Motor Coupling Hub 5 MM Internal Dia (ID) (BIG) ₹ 472
Leadshine DM542 Digital Stepper Motor Driver ₹ 2699
TB6600 Stepper Motor Driver Controller 8~50V 4.5A ₹ 664

New Price: ₹ 649

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Category: Stepper Motors and Accessories
Tags: Stepper Motor, Nema, Nema17

The stepper motors move in precisely repeatable steps, hence they are the motors of choice for the machines requiring precise position control. The NEMA17 4.2 kg-cm Stepper Motor can provide 4.2 kg-cm of torque at 1.2A current per phase.

The motor’s position can be commanded to move or hold at one position with the help of Stepper Motor Drivers. The NEMA17 4.2 kg-cm Stepper Motor provides excellent response to starting, stopping and reversing pulses from stepper motor driver.

They are very useful in the various application, especially which demands low speed with high precision. Many machines such as 3D Printers, CNC Router and Mills, Camera Platforms, XYZ Plotters etc.

It is a brushless DC motor, so the life of this motor is dependent upon life of the bearings. The position control is achieved by a simple Open Loop control mechanism so doesn’t require complex electronic control circuitry.

It comes with a detachable 70cm cable which makes wiring and rewiring very fast and easy work. The design of this cable is such that it can directly be mounted on a stepper motor controller. So, playing with the connection is done with just snap of fingers.

The motor’s shaft has been machined for good grip with a pulley, drive gear etc., and especially avoiding stall or slip.

We are engaged in supplying and wholesaling a quality approved collection of the Stepper Motors which are highly acknowledged and accepted for long service life and high reliability. To explore more of them click below, 

Stepper Motors

Note :

  1. The Nema17 4.2kgcm Stepper motor dimensions and weight may have  ±2% error.
  2. Resonances can occur because of improper installment.
  3.  Not easy to operate at extremely high speeds.
  4.  You need TB6600 or DM542 driver to run NEMA motors because they have switches to provide more current to motors.
  5. We have another motor 42HS40-1504 NEMA17 which is similar to this one, except 42HS40-1504 NEMA17 has 21mm shaft length, 1m cable, 38mm motor height, and some technical parameters such as it’s Supply Current (A) is 1.5 A/Phase. Kindly note and buy accordingly. 

Features :

  1. Input pulse decides the rotation angle of the motor.
  2. High accuracy of around 3 to 5% a step.
  3. Provides good starting, stopping and reversing.
  4. Control of this motor is less costly because of exclusion of complex control circuitry.
  5. The speed is proportional to the frequency of the input pulses.

Package Includes :

1 x JK42HS40-1204AF-02 NEMA17 4.2 kg-cm Stepper Motor – D-Type Shaft

Supply Current (A)

1.2 A/Phase

No. of Leads


Inductance (mH/Phase)


Rotor Inertia (gm-cm2)


Weight (gm)


Dimensions (mm) LxWxH


Detent Torque (kg-cm)


Frame Size (mm)

42 x 42

 Inductance Accuracy


Resistance Accuracy


Shaft Type


Shaft Diameter (mm)


Shaft Length (mm)


Step Angle Accuracy


Cable Length (cm)


Shipping Weight 0.35 kg
Shipping Dimensions 5 × 5 × 7 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects.  Reimbursement or replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

Based on 11 reviews

4.8 overall

Add a review

  1. Prakash Jidiya (verified owner)

    ok good

    Prakash Jidiya

  2. ckovoor (verified owner)

    Excellent. Torque to Rated Current…..as described.


  3. tabishakhtarsr (verified owner)

    very low noise and smooth motor with great power


  4. nharishankar (verified owner)

    Works amazing, powerful and accurate. You can reduce the noise with the right driver.


  5. 3DEYE 3DPrinting (verified owner)

    Product is good working. But courier was too bad within 2 day its came to my city and took 6 days to deliver.

    3DEYE 3DPrinting

  6. Chinmay (verified owner)

    Compact n powerful motor


  7. Teerth (verified owner)

    I bought 4 motors from robu and was working well, feel safe to buy from robu.


  8. Sachin Bhangale (verified owner)

    Good motor. working good. but not sure its 4.2Kg-cm

    Sachin Bhangale

  9. [email protected]

    excellent product

    [email protected]

  10. shivaprasad.n (verified owner)

    Have purchased 6 of this so far for my dual extruder Prusa. Very good build quality and fits perfect


  11. [email protected] (verified owner)

    Product is nice and working perfectly

    [email protected]


Questions and answers of the customers

  1. 0 votes
    There are no answers for this question yet. Answer now
  2. 0 votes

    You need a TB6600 or  Read more

  3. 0 votes
    Q What is the rated voltage for this stepper motor? answer now
    Asked by omkar.6997 on March 16, 2023 2:12 pm

    To operate this motor need a motor driver. You ... Read more

  4. 0 votes
    Q what are the voltage specifications for this stepper motor? answer now
    Asked by shakoor.rehan2017 on September 22, 2022 2:03 am

    You can give up to 12-24 VDC to this stepper mo... Read more

  5. 0 votes
    Q Is this bipolar or unipolar? answer now
    Asked by Adwait Patankar on August 4, 2020 8:57 pm

    for your query, drop the mail at [email protected] Read more

  6. 0 votes
    Q Can we use DRV8825 driver for this motor...? answer now
    Asked by noormohammed1112222 on July 14, 2020 8:59 pm

    Yes, you can use

  7. 0 votes
    Q Can it be supplied with 12volt 2 amp DC ?
    Asked by AKP on July 14, 2020 4:35 pm
    There are no answers for this question yet. Answer now
  8. 1 vote
    Q what is a+ and a- wires? answer now
    Asked by kswwarrier on February 11, 2020 4:15 pm

    A stepper motor consists of a fixed stator made... Read more

  9. 1 vote
    Q Is this unipolar or bipolar..??? answer now
    Asked by rohithkhari460 on January 29, 2020 7:19 pm

    This is a Hybrid Stepper Motor.

  10. 0 votes
    Q Does it give feed back? answer now
    Asked by Anonymous user on December 3, 2019 2:45 pm

    It does not generate any feedback, but as it is... Read more

  11. 0 votes
    Q Are you sure it is having 4.2kg-cm tongue?? answer now
    Asked by sumantabaskey1020 on November 13, 2019 6:40 pm

    Yes, as per the specifications it has 4.2 Kgcm ... Read more

Only registered users are eligible to enter questions
Country Of Origin: China

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