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NEMA 8 Stepper Motor

NEMA 8 Stepper Motor inch20x20 mm Series two-phase (four-phase ) stepper motor high holding torque is a compact and highly precise electromechanical device that plays a crucial role in various applications requiring precision motion control. With its compact size and exceptional performance, the NEMA 8 stepper motor has become a popular choice in industries ranging from robotics and automation to medical equipment and 3D printing.

  • 20H

  • CS

  • 8501109990

  • 20mm

  • 2 or 4 phase

  • 0.2A~0.8A


  • 28mm~42mm


NEMA 8 Small Stepper Motor made by the manufacturer&supplier -Cosda Automation

NEMA 8 Stepper Motor Description:

We're the professional hybrid stepper motor manufacturer. A NEMA 8 stepper motor is a type of hybrid stepper motor that conforms to the standards set by the National Electrical Manufacturers Association (NEMA). The NEMA 8 designation signifies the physical dimensions of the motor. Specifically, it denotes the faceplate dimensions of the motor in inches. For NEMA 8, the faceplate is approximately 0.8 x 0.8 inches (20mm x 20mm). These motors are relatively small and lightweight, making them suitable for applications where space is limited or weight is a concern.

NEMA 8 Hybrid Stepper motor made by the stepper motor manfacturer Cosda Automation has the following characters :

Small size NEMA 8 Stepper Motor 20mm hybrid stepper motor

Model: NEMA8, 20H

Phase: 2phase 

Stepper Angle: 200 steps per revolution (1.8 deg/step)1.8º

Low Current

High Holding Torque

Lead wire no.: 4 wires

Speed: low or high speed

Shape: Square

NEMA 8 Stepper Motor Features:



Some of the main features of a NEMA 8 stepper motor include:

● High torque-to-size ratio

● Accurate positioning and repeatability

● Low power consumption

● Smooth and quiet operation

● Easy to control and program

● Available in a range of step angles and holding torques

NEMA 8 Stepper Motor Paramaters:

Step Angle----------------------------- 1.8°±5%

Temperature Rise-------------------------- 80℃ Max.

Insulation Resistant-------- 100MΩ Min.,500VDC

Dielectric Strength-------- 500VAC for one minute

Ambient Temperature ---------- —20~+50

Shaft Radial Play------------------------------- 0.02Max.(450 g-load)

NEMA 8 Stepper Motor Technical Specs :

Model No.

Rated Voltage




Holding Torque


No.of leads


Signal shaft

Double Shaft




















































NEMA 8 Stepper Motor Dimensions :

Nema 8 stepper motor size 

NEMA 8 Stepper Motor Wiring Diagram 

4 wires

NEMA 8 Stepper Motor Wire Colors can be customized

The stepper motors can be customized according to the customers' requirements.

NEMA 8 Stepper Motor Customizable Factors:

● Motor Shaft

● Cable

● Connector

● Encoder

● Brake

● Gearbox

NEMA 8 Stepper Motor Data Sheet Download 

NEMA 8 Hybrid Stepper Motor .pdf

Size and Dimensions of NEMA 8 Stepper Motor

NEMA 8 stepper motors belong to a compact size category. The "8" in the designation refers to the mounting face size of the motor in inches. These motors are relatively small, making them ideal for applications where space is limited.

Torque and Resolution of NEMA 8 Stepper Motor

NEMA 8 stepper motors offer a good balance between torque and resolution. While they might not deliver the same high torque as larger NEMA-rated motors, they provide sufficient torque for various precision applications.

How NEMA 8 Stepper Motors Work

NEMA 8 stepper motors are designed based on a simple yet effective principle. These motors convert electrical pulses into discrete mechanical movements or steps, allowing for precise control over the position and speed of the motor shaft. The motor's rotor moves in small angular increments, making it ideal for applications that demand accuracy and repeatability.

Applications of NEMA 8 Stepper Motor

NEMA 8 stepper motors find applications in industries like medical equipment, robotics, 3D printing, camera systems, and small CNC machines.

Advantages of NEMA 8 Stepper Motors

Precision and Control

NEMA 8 stepper motors offer excellent precision and control, allowing for accurate and repeatable positioning. They can perform tasks with high accuracy, making them indispensable in applications that require fine adjustments.

Compact Size

The compact size of NEMA 8 stepper motors makes them suitable for devices and equipment with limited space. This advantage allows engineers to design more compact and lightweight products.

Low Power Consumption

NEMA 8 stepper motors are energy-efficient and consume less power compared to some other motor types. This efficiency is beneficial for applications that prioritize energy conservation.

Limitations of NEMA 8 Stepper Motors

Limited Torque

Due to their smaller size, NEMA 8 stepper motors have lower torque capabilities compared to larger stepper motors. While they are suitable for many applications, high-torque requirements might necessitate larger motors.

Limited Speed

NEMA 8 stepper motors have limitations regarding their maximum speed. If high-speed operation is a critical requirement, alternative motor types might be more suitable.

Choosing the Right NEMA 8 Stepper Motor for Your Application

Torque Requirements

When selecting a NEMA 8 stepper motor, it is crucial to consider the torque requirements of the application. Ensure that the motor can provide sufficient torque to drive the load.

Step Angle

NEMA 8 stepper motors typically have a step angle of 1.8 degrees, meaning they move 1.8 degrees per step. This value affects the motor's resolution and positioning accuracy.


Microstepping is a technique that allows for smoother motion and increased resolution in stepper motors. Understanding and implementing microstepping can improve the performance of NEMA 8 motors.

How to Drive and Control NEMA 8 Stepper Motors

Driver Circuits

To control NEMA 8 stepper motors, driver circuits are essential components. These circuits interpret control signals and supply the necessary current to drive the motor.

Pulse and Direction Control

NEMA 8 stepper motors typically use a pulse and direction control interface. By varying the pulse frequency and sequence, the motor can move in either direction and at different speeds.

Microcontrollers and PLCs

Microcontrollers and Programmable Logic Controllers (PLCs) are commonly used to interface with and control NEMA 8 stepper motors. They offer a flexible and programmable solution for precise motor control.

Installation, Maintenance and Care Tips


Ensure the motor is securely mounted to avoid vibration and misalignment issues.


Check the wiring connections regularly to prevent loose connections and potential damage.


Proper lubrication is essential to ensure the smooth operation and longevity of NEMA 8 stepper motors. Regularly lubricate the motor according to the manufacturer's guidelines.

Temperature Considerations

Pay attention to the operating temperature of NEMA 8 stepper motors, as excessive heat can affect performance and lifespan. Adequate cooling may be necessary in certain applications.

Protecting Against Overloads

Avoid overloading NEMA 8 stepper motors beyond their specified capacity to prevent damage and ensure optimal performance.

Dust and Debris

Keep the motor's surroundings clean to prevent dust and debris from affecting its performance.

Comparing NEMA 8 Stepper Motors with Other Motor Types

NEMA 8 vs. NEMA 17

NEMA 8 stepper motors are smaller than NEMA 17 motors, making them suitable for more compact applications. However, NEMA 17 motors typically offer higher torque.

NEMA 8 vs. Servo Motors

NEMA 8 stepper motors provide precise positioning at a lower cost compared to servo motors. However, servo motors excel in high-speed and high-torque applications.

Future Trends and Developments in NEMA 8 Stepper Motors

As technology advances, NEMA 8 stepper motors are likely to see further improvements in their performance, efficiency, and miniaturization. Innovations may lead to enhanced torque density, reduced power consumption, and integration of advanced control features.

FAQs for NEMA 8 Hybrid Stepper Motor :

1. Can I use a NEMA 8 stepper motor for high-speed applications?

Yes, NEMA 8 stepper motors can be used for certain high-speed applications, but they might have limitations in achieving extremely high speeds.

2. Are NEMA 8 stepper motors suitable for industrial automation?

Yes, NEMA 8 stepper motors find applications in industrial automation where precise and controlled movements are required. However, their use in industrial settings may depend on the specific requirements of the automation process.

3. What are the typical voltage and current ratings for NEMA 8 motors?

The voltage and current ratings for NEMA 8 stepper motors can vary based on the specific model and manufacturer. It is essential to refer to the motor's datasheet for accurate and detailed information.

4. Can I replace a NEMA 8 motor with a higher-rated one for more torque?

In most cases, it is possible to replace a NEMA 8 stepper motor with a higher-rated one to achieve more torque. However, consideration should be given to the physical dimensions and mounting compatibility of the new motor.

5. How do I wire and connect a NEMA 8 stepper motor?

Wiring and connecting a NEMA 8 stepper motor depend on the specific driver and controller being used. Typically, the motor will have four or six wires that need to be connected to the corresponding terminals on the driver. The driver, in turn, will be connected to a microcontroller, PLC, or other control system that sends pulses to control the motor.

FAQs for the factory : 

1. Are you a factory?

Yes, we are facotry, and we produce Stepper Motor& Stepper Motor Driver,  Switching Power supply, Short Cycle Press Line and other automatic machines.

2. How to select models?

Before purchasing, please contact us to confirm model No. and drawings to avoid any misunderstanding.

3. Do you offer OEM & ODM service? 

Yes.We can supply OEM&ODM and make customized design for any specific application.

4. How can we know the product quality?

We suggest you ording a sample. And you can also send us email with detailed photos and specifications for checking if you cannot get enough information in the product page.

5. What's the delivery time?

Except special order.For samples usually 10-14 working days .For batch order .Usually 17-25days. For Stock motors usually 1~2 days.

Cosda Automation is a manufacturer of a wide variety of automatic products.



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