20mm Linear Screw Stepper Motor 2-Phase 4-Wire 3D Printer
20mm Linear Screw Stepper Motor 2-Phase 4-Wire 3D Printer
20mm Micro Linear Screw Stepper Motor – 2-Phase 4-Wire Linear Actuator
Precision-engineered for makers, engineers, and DIY enthusiasts, this compact 20mm 2-phase 4-wire linear screw stepper motor delivers accurate, repeatable linear motion in a slim, lightweight form factor. Ideal for 3D printers, CNC machines, robotic arms, camera sliders, lab equipment, and automated mechanisms, this miniature linear actuator combines a threaded screw with a stepper motor to convert rotational steps into precise straight-line travel — all within an 88mm overall length.
Key Features
- Compact 20mm Diameter — Fits tight spaces without sacrificing precision or torque
- 55mm Slider Stroke — Generous travel range for a micro-class actuator
- 0.5mm Screw Pitch — Fine resolution per step for accurate positioning
- 18° Step Angle — 20 steps per revolution for smooth, controllable incremental movement
- 12V / 600mA Drive Voltage — Standard voltage compatible with most microcontroller driver boards
- Low Operating Voltage — Below 50Vac / 75Vdc, EU LVD compliant
- No Battery Required — Runs directly from your project's power supply
- Standard 4-Wire Wiring — Yellow A+, Blue A−, Black B+, Red B− for straightforward driver hookup
Technical Specifications
| Motor Type | 2-Phase, 4-Wire Stepper |
| Motor Diameter | 20mm |
| Drive Voltage | 12V / 600mA |
| Screw Length | 66mm |
| Slider Stroke | 55mm |
| Screw Diameter | 3mm |
| Light Shaft Diameter | 3mm |
| Screw Pitch | 0.5mm |
| Step Angle | 18° |
| Phase Resistance | 20 Ohms |
| Overall Dimensions | 88 × 20 × 21.5mm |
| Wire Colors | Yellow A+, Blue A−, Black B+, Red B− |
⚠️ Important Note: This stepper motor cannot be operated by directly connecting to a power source — it requires a compatible stepper motor driver board and a microcontroller board (e.g. Arduino, Raspberry Pi) to function. Higher drive voltage increases thrust force but also generates more heat; ensure adequate cooling in enclosed builds.
Made in Mainland China.
Perfect For
- DIY 3D printer Z-axis or extruder mechanisms
- CNC engraver and router tables
- Automated camera sliders and focus rails
- Robotic arm linear joints
- Lab automation and scientific instruments
- Electronics prototyping and maker projects
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Frequently Asked Questions
Q: Can I connect this linear stepper motor directly to a 12V power supply to make it move?
A: No — a stepper motor cannot run by directly connecting its wires to a power supply. You must use a compatible stepper motor driver board (such as a DRV8825 or A4988) paired with a microcontroller (e.g. Arduino) to send the correct step pulses and control direction. Direct connection will not produce rotation and may damage the motor windings.
Q: What is the travel stroke of this linear actuator and how precise is each step?
A: This 20mm linear screw stepper motor offers a 55mm slider stroke with a 0.5mm screw pitch and 18° step angle (20 steps per revolution). Each full step moves the nut approximately 0.025mm linearly, making it well-suited for fine-position applications such as 3D printer axes and camera focus rails.
Q: Is this stepper motor compatible with 3D printers and Arduino-based projects?
A: Yes. The 2-phase 4-wire design is widely compatible with standard stepper driver modules commonly used in 3D printers and Arduino/Raspberry Pi maker projects. Simply wire the four leads (Yellow A+, Blue A−, Black B+, Red B−) to your driver board and configure the step angle and microstepping settings in your firmware.
Q: Does operating at higher voltage improve performance?
A: Increasing the drive voltage above 12V can provide greater thrust force and faster response; however, it also increases heat generation in the motor windings. If you operate at elevated voltages, ensure proper thermal management — such as heat sinks or active cooling — to maintain reliable long-term operation.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.