NEMA 17 Worm Gear Motor 42mm – Low Speed High Torque Self-Locking Stepper Motor (24V)

High Torque NEMA 17 Worm Gear Motor with Self-Locking Design

This worm gear motor is a compact NEMA 17 stepper motor integrated with a precision worm gearbox, designed for low-speed and high-torque applications.
Thanks to the mechanical characteristics of the worm drive gear, the motor provides a reliable self-locking function, ensuring the load position remains stable even when power is removed.

Integrated Worm Gearbox for Stable and Precise Motion

The integrated worm gear gearbox converts high-speed motor rotation into smooth, controlled low-speed output.
Compared with traditional spur or planetary gear systems, the gearbox worm drive offers superior holding torque and shock resistance.
This makes the motor ideal for lifting mechanisms, valves, conveyors, medical equipment, and industrial automation systems.

Electrical and Mechanical Performance

This NEMA 17 worm gear motor operates at 24V DC and supports pulse control with multiple subdivision settings.
The stepper motor delivers accurate positioning, while the worm drive structure increases output torque significantly.
For OEM and automation projects, both shaft size and gearbox ratio can be customized.

Motor Specifications

Parameter	Value
Step Angle	1.8° ±5%
Number of Phase	2
Phase Voltage	2.8 VDC
Phase Current	2.0 A
Phase Resistance	1.4 Ω ±10% (20℃)
Phase Inductance	3.0 mH ±20%
Static Torque	0.59 N·m
Insulation Class	Class B
Insulation Resistance	≥100 MΩ (500V DC)
Ambient Temperature	-20℃ to +50℃
Humidity	15% – 95%
Motor Weight	Approx. 0.4 kg
Rated Voltage	DC 12–36V

Dimensions (mm)

Item	Dimension
Frame Size	NEMA 17 (42mm)
Gearbox Length	26.8 mm
Total Length	133 mm
Output Shaft Diameter	Customizable

Subdivision Settings (Pulse / Rev)

Pulse/Rev	SW3	SW4	SW5	SW6
200	on	on	on	on
400	off	on	on	on
800	on	off	on	on
1600	off	off	on	on
3200	on	on	off	on
6400	off	on	off	on
12800	on	off	off	on
25600	off	off	off	on

Spontaneous Pulse Speed Settings

RPM	SW3	SW4	SW5	SW6
200	on	on	on	on
400	off	on	on	on
800	on	off	on	on
1600	off	off	on	on
3200	on	on	off	on
6400	off	on	off	on

Typical Applications

• Automatic doors and actuators
• Medical and laboratory equipment
• Industrial automation systems
• Positioning platforms
• Self-locking lifting mechanisms

Download Datasheet

Download the full specification sheet for detailed parameters, wiring guide, and performance curves.

📄 Download PDF Datasheet

This stepper motor belongs to our

Stepper Motor series
, designed for industrial automation applications.

What is a worm gear motor?

A worm gear motor uses a worm drive gear and worm gearbox to reduce speed and increase torque. It is widely used where high holding torque and compact design are required.

Why does a worm gear motor have a self-locking function?

Due to the friction angle between the worm and the gear, most worm gear motors cannot be back-driven. This self-locking feature keeps the load in position when power is off.

Is this worm gear motor available in 12V and 24V?

Yes, this worm gear motor supports both 12V and 24V DC configurations depending on application requirements.

What applications are suitable for a worm gear gearbox?

Worm gearboxes are ideal for lifting systems, automation equipment, medical devices, and any application requiring low speed, high torque, and stable holding performance.

 

If you are comparing self-locking gear mechanisms, our technical guide explains the differences in detail:

Worm Gear Motor vs Planetary Gearbox