Hollow shaft stepper motors enable clean wiring, easy mounting, and direct through-shaft mounting for gadgets like extruders, CNC tools, and robotics. This guide highlights five top hollow shaft models, explains who each is best for, and helps you choose based on shaft size, phase, and compatibility. The selections favor compact NEMA and small-size hollow options ideal for DIY CNC projects, 3D printers, and light automation tasks. Below is a quick summary table of the featured products to compare key details at a glance.
| Product | Shaft Size | Phase | Best For | Notes |
|---|---|---|---|---|
| 20mm Dual Hollow Shaft Stepper (MDFLY) | 20mm | 2 Phase | Compact printers and small CNCs | Dual hollow shaft for through-bore applications |
| NEMA11 28mm Dual Shaft Hollow (MDFLY) | 28mm | 2 Phase | Small robotics and precise lead-through systems | Dual hollow shaft enhances mounting options |
| CYFANG 1.8° 4 Phase Hollow Shaft (Nema 17) | 8 mm hollow shaft | 4 Phase | Precision extruders and compact automation | Low current; compact 39x39x22mm body |
| 1 PC NEMA8 Hollow Shaft (Xinhuangduo) | 8 mm? | 2 Phase | Budget builds and small mills | ROHS/CCC certifications cited |
| Hollow Rotary Platform Kit (TOSEASTARS) | Supports standard NEMA17 shafts | N/A | Rotary positioning with hollow design | Includes rotating platform with 10:1 ratio |
Best Overall: MDFLY 20mm Dual Hollow Shaft Stepper
This 20mm dual hollow shaft motor is designed for compact assemblies where through shafts simplify mounting and wiring. With a 2-phase, 1.8-degree step angle, it provides smooth microstepping potential and straightforward integration for small CNCs, extruders, and robotics. Best for budget-conscious builders needing a reliable, space-saving option. Choose this if you want a simple, through-bore design with minimal footprint and proven compatibility in light automation tasks. A limitation is the lack of explicit torque specifications in the listing, so confirm torque for heavier loads before committing.
Solid 28mm Dual Shaft Hollow: MDFLY NEMA11
This NEMA11 dual-shaft hollow motor is suited for compact automation projects requiring through-bore capabilities. With 2-phase operation and a 1.8-degree step angle, it balances size and performance for small CNCs, micro-assembly lines, or robotics modules. Best for compact installations where mounting flexibility and through-hole wiring matter. A potential limitation is that detailed torque curves or holding torque figures are not provided in the listing, so verify suitability for heavier loads.
CYFANG Hollow Shaft: 1.8° 4 Phase Nema 17
CYFANG’s compact NEMA17 hollow shaft motor uses a 1.8-degree step angle with 4-phase configuration and a through-hole shaft. Its dimensions (39x39x22mm) make it ideal for tight extruder assemblies, small printers, and other space-constrained devices. Best for precision-focused builds that benefit from higher phase count for smoother motion. Limitation: current and power ratings indicate modest torque; ensure load requirements align with the 0.05A current rating and 5W power.
Small Hollow Shaft: Xinhuangduo Nema 8 Motor
This NEMA8 hollow-shaft motor from Xinhuangduo targets compact projects like micro-milling, mini CNCs, and 3D printers. It is marketed with ROHS and CCC certifications, which can reassure compliance-minded buyers. Best for small, budget-friendly builds where a hollow shaft improves integration with through-bore accessories. A caution is that publicly stated torque data is not included; confirm torque requirements against your application.
Hollow Rotary Platform With Nema17 Compatibility
This hollow rotary actuator from TOSEASTARS provides a 10:1 gear ratio with a high-precision hollow design that accommodates standard NEMA17 through-shafts. Best for projects needing precise positioning, repeatable motion, and easy integration with hollow motor designs. It’s a viable option when a rotating platform is the core requirement. Limitation: the data focuses on platform specs rather than motor torque; ensure your motor meets required torque for your application.
Buying Guide: Key Considerations For Hollow Shaft Stepper Motors
- Through-shaft compatibility: Confirm bore size and whether you need a through-bore for cables, sensors, or tooling.
- Step angle and driving phase: 1.8° is standard; 2-phase motors are common for basic systems, while higher-phase variants offer smoother microsteps.
- Size and mounting: Match the mechanical footprint (NEMA codes and hollow shaft diameter) to your enclosure and mounting hardware.
- Torque and current ratings: Look for explicit torque or holding torque data and ensure power limits align with your load requirements.
- Rotary platforms and accessories: If using a rotating table or direct-drive substitute, verify compatibility with your motor shaft size and flange pattern.
- Certifications: ROHS/CCC marks can be helpful for compliance in certain projects; verify if required for your region.
Frequently Asked Questions
- What is hollow shaft motor used for?: They allow through-shaft mounting, clean wiring, and easier integration with accessories like extruders or rotary platforms.
- Is a higher phase count better?
- Higher phase counts can offer smoother motion and finer microstepping, but require appropriate drivers and power.
- Do hollow shaft motors come with torque specs?
- Torque figures vary by model; always check the datasheet or product listing for holding torque and peak torque values before selecting for a load.
- Can I mix a hollow shaft motor with a hollow rotary platform?
- Yes, provided the shaft diameters and mounting interfaces align; verify flange compatibility and mechanical clearances.
- What should I verify before buying?
- shaft size, phase configuration, current rating, and whether the through-hole path suits your wiring or accessory layout.