When precision and reliability matter, lead screw stepper motors are a top choice for 3D printers and small CNC machines. This guide highlights five proven options, each pairing a NEMA 17 body with a built-in or long lead screw for stable, accurate linear motion. Across varied lengths and torque profiles, these motors support smooth operation, straightforward wiring, and easy integration into common Prusa, RepRap, and hobby CNC setups.
| Product | Brand | Lead Screw Length | Current | Torque | Link |
|---|---|---|---|---|---|
| YEJMKJ 42×40 Nema 17 Lead Screw Stepper Motor | YEJMKJ | 150 mm | 1.7 A | 0.4 Nm | https://www.amazon.com/dp/B0CX8Z2MGT?tag=somicnke-20 |
| Iverntech NEMA 17 Stepper With 100 mm T8 Lead Screw | Iverntech | 100 mm | 2 A | 400 mN·m | https://www.amazon.com/dp/B07YQRCHW7?tag=somicnke-20 |
| Iverntech NEMA 17 Stepper With 300 mm T8 Lead Screw | Iverntech | 300 mm | 2 A | 400 mN·m | https://www.amazon.com/dp/B07D6GC4C4?tag=somicnke-20 |
| Iverntech 359 mm TR8x2 Lead Screw Model | Iverntech | 359 mm | 1.5 A | 500 mN·m | https://www.amazon.com/dp/B0FHWL5N3G?tag=somicnke-20 |
| FYSETC Prus MK3S+ Z Motor 2-Pack | FYSETC | 320 mm | 1.0 A | 340 mN·m | https://www.amazon.com/dp/B0BN81M7T8?tag=somicnke-20 |
Introductory note: This article concentrates on lead screw stepper motors with 42 mm frames (NEMA 17) and integrated or long lead screws suitable for 3D printers and small CNC machines. It aims to provide objective, comparative insight for American readers researching durable, cost-effective motion components.
YEJMKJ 42×40 Nema 17 Lead Screw Stepper Motor
Key details show a 1.8° step angle, two phases, and a rated current of 1.7 A. With a 150 mm lead screw and a 0.4 Nm holding torque, this motor is positioned for precise Z-axis actuation, linear motion tasks, and small automation systems. The compact form factor (42 mm length) supports tight machine assemblies, while the 4-conductor wiring facilitates straightforward driver integration. Applications span 3D printing, CNC milling, engraving, and medical devices where stable positioning matters.
Features highlighted in product notes include precise step resolution (2000 steps per revolution), robust torque for small-format machines, and suitability for high-precision positioning. Rotor inertia and wire gauge contribute to responsive control in typical hobby and light industrial setups.
Iverntech NEMA 17 Stepper With Integrated 100mm T8 Lead Screw
This model combines a NEMA 17 frame with a 100 mm T8 lead screw, suitable for Z-axis tasks in RepRap or Prusa-style printers. The motor delivers 400 mN·m of torque and includes a brass nut plus a 1-meter motor cable, simplifying integration. Its 2-phase, 4-wire design aligns with common stepper drivers, and the 2 mm pitch with 4 starts ensures stable linear travel and predictable advancement per step. Ideal for compact builds where space is at a premium.
Iverntech NEMA 17 With 300mm T8 Lead Screw
This variant extends the lead screw to 300 mm, benefiting projects requiring deeper travel or longer Z-axis motion. It shares the same NEMA 17 footprint and 2-phase, 4-wire configuration, delivering about 400 mN·m torque. The included brass nut and 1-meter motor wire support quick deployment in DIY CNC, laser engraving, or 3D printer upgrades. The longer screw enhances travel range while maintaining reliable step accuracy for layered fabrication tasks.
Iverntech 359 mm TR8x2 Lead Screw Motor Assembly
With a 359 mm lead screw, this option emphasizes long-travel Z-axis capabilities while maintaining a compact 42×48 mm frame. The motor provides 1.5 A per phase for steady motion and a holding torque around 500 mN·m. A 1.8° step angle paired with 4-wire wiring provides precise incremental motion, with a nut and motor wire included to simplify assembly. Suitable for advanced printer upgrades, CNC milling, and high-precision automation work where linear travel is a priority.
FYSETC Prus MK3S+ Z Motor 2-Pack
Packaged as a two-motor kit designed for Prusa MK3S+ Z-axis upgrades, these 42-34 mm motors integrate a 320 mm lead screw with 2-phase, 4-wire wiring. The stated torque is around 340 mN·m, with a 1 A current rating and 1.8° step angle. The kit includes the necessary wiring and fasteners, making it a practical option for users replacing or upgrading Z motors in multi-motor configurations. Applications extend to small CNC projects and laser-engraving rigs where synchronized Z motion matters.
Buying Guide
Key considerations when choosing a lead screw stepper motor:
- Torque and current: Higher holding torque improves load-bearing capability but may require more robust drivers and cooling. Compare torque specifications with your intended load and travel speed.
- Lead screw length and pitch: Longer screws offer greater travel but can increase backlash and friction. A 2 mm pitch with a 2-phase, 4-wire motor provides reliable, predictable steps for Z-axis motion.
- Frame size and mounting: A 42×40 mm (NEMA 17) frame is widely compatible with hobby printers and light CNCs. Check mounting holes and shaft diameter (often 10 mm) to ensure compatibility with existing brackets.
- Lead screw type: TR8x2 and T8 screws are common; consider screw length, nut type, and lubrication needs to minimize wear and noise in long runs.
- Integrated vs. separate components: Integrated lead screws simplify assembly and reduce misalignment risk, while separate screws offer customization but require precise coupling and alignment.
- Wiring and compatibility: Look for 4-wire, 2-phase configurations with standard driver interfaces. Ensure cable length suits your machine layout and controller wiring.
- Application fit: For high-precision 3D printers, prioritize low backlash and stable holding torque. For CNC or engraving, consider travel length and torque balance to maintain cutting accuracy during motion.
Performance perspective: For compact builds, a motor with a 100–150 mm lead screw tends to balance travel range with controllability. For larger printers or multi-axis setups, longer screws (200–400 mm) paired with stable micro-stepping drivers can reduce step loss and improve repeatability. Always verify compatibility with your controller, driver current limits, and heat management needs.