NEMA 17 Through-Screw Linear Screw Actuator | 42mm Stepper Motor

This NEMA 17 through-screw motor is a high-precision linear screw actuator integrating a hybrid stepper motor and a 6.35mm lead screw.
With its compact 42mm frame size, 1.8° step angle, and 0.28Nm holding torque, it provides consistent, stable, and accurate linear motion for automation, CNC equipment, testing devices, 3D printers, and linear drive mechanisms.

Main Features

• Integrated design: stepper motor + through lead screw
• High precision 1.8° step angle
• 6.35mm screw diameter and 3.175mm lead for fine positioning
• Wide voltage range: DC 12–24V
• Low current 0.75A per phase
• Suitable for linear shaft systems and compact linear drive applications
• Stable 0.28Nm holding torque
• Customizable screw length

Technical Parameters

Parameter	Specification
Motor Model	NEMA 17 Through Screw Stepper Motor
Frame Size	42×42 mm
Step Angle	1.8° ± 5%
Rated Voltage	DC12–24V
Phase Current	0.75A
Holding Torque	0.28Nm
Resistance	6.0Ω ±10%
Inductance	10.5mH ±20%
Insulation Class	Class B
Ambient Temp	-20°C to +50°C
Motor Weight	Approx. 0.25kg

Lead Screw Specifications

Item	Specification
Screw Diameter	6.35mm
Lead (Pitch)	3.175mm
Step per revolution	200 steps (1.8°)
Screw Material	POM nut / Stainless steel screw
Screw Length	Customizable (100mm–600mm)
Drive Mode	Internal screw drive

Motor Dimensions

Dimension	Value
Motor Body Length	34mm
Mounting Size	42×42mm
Mounting Hole Spacing	31±0.1mm
Front Plate Thickness	8mm
Overall Shaft Length	Customizable

Wiring Diagram

Wire Color	Function
Black	A+
Green	A−
Red	B+
Blue	B−

Excitation Sequence & Direction of Rotation

Step	A+	A−	B+	B−
1	+	−	+	−
2	+	−	−	+
3	−	+	−	+
4	−	+	+	−

Viewed from the mounting surface: CW and CCW directions follow the above excitation pattern.

Customization Options

Custom screw length, connectors, cables, and optional modifications are available.
For custom wires, visit:
Custom Extension Cable

FAQ

1. Ball screw vs lead screw — which is better?

Ball screws offer higher efficiency and lower friction, suitable for heavy-load CNC systems.
Lead screws are quieter, lower cost, and ideal for compact linear actuators like stepper motor linear systems.

2. What is a stepper motor with a lead screw?

It combines a stepper motor and a lead screw to convert rotary motion into precise linear movement.

3. Why is it called a “screw stepper motor” or “linear stepper motor”?

Both terms describe the same device.
“Screw stepper motor” emphasizes the integrated screw.
“Linear stepper motor” emphasizes the output motion (linear movement).
Functionally they are the same.

Download Datasheet

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

📄 Download PDF Datasheet