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AW39HS Series — NEMA 16 Stepper Motor with Hollow Shaft
The AW39HS series is Apexwell's NEMA 16 (39mm) hybrid stepper motor line built around a through-bore hollow shaft, letting cables, optical fibers, pneumatic lines, or a pass-through mechanism run directly through the rotor axis instead of routing around the motor. Across five body lengths from 34mm to 54mm, holding torque scales from 0.16 N·m to 0.45 N·m, positioning this frame size between the AW35HS and AW42HS hollow-shaft lines for applications needing finer torque granularity than either neighboring platform offers.
Shared Specifications (all models)
| Parameter | Value |
|---|---|
| Step Angle | 1.8° |
| Step Accuracy | ±5% |
| Lead Wires | 4 (bipolar) |
| Shaft Type | Through-bore hollow shaft |
| Insulation Class | Class B (130°C) |
| Temperature Rise | 50K Max |
| Ambient Temperature | -20°C to +50°C |
| Insulation Resistance | ≥100 MΩ (500 VDC) |
| Dielectric Strength | 500 VAC, 1 minute |
Model Comparison
| Model | Body Length | Phase Current | Phase Resistance | Phase Inductance | Holding Torque | Rotor Inertia | Mass |
|---|---|---|---|---|---|---|---|
| AW39HS34-0404A | 34 mm | 0.40 A | 30.0 Ω | 35.0 mH | 0.16 N·m | 26.5 g·cm² | 0.16 kg |
| AW39HS38-1004A | 38 mm | 1.00 A | 2.0 Ω | 3.7 mH | 0.23 N·m | 37.0 g·cm² | 0.21 kg |
| AW39HS44-1004A | 44 mm | 1.00 A | 6.0 Ω | 14.8 mH | 0.45 N·m | 46.0 g·cm² | 0.26 kg |
| AW39HS47-1004A | 47 mm | 1.00 A | 7.8 Ω | 17.0 mH | 0.45 N·m | 41.0 g·cm² | 0.30 kg |
| AW39HS54-1504A | 54 mm | 1.50 A | 2.3 Ω | 5.8 mH | 0.45 N·m | 55.6 g·cm² | 0.40 kg |
Typical Applications
With a through-bore hollow shaft on a NEMA 16 footprint, the AW39HS series fits rotary stages needing cable or fiber-optic pass-through, camera and lens positioning systems, robotics wrist and turret joints, and small CNC or dispensing equipment where NEMA 14 doesn't have enough torque and NEMA 17 is larger than the design needs.
Why Choose the AW39HS Series
A hollow shaft removes the need for a separate cable pass-through mechanism or slip ring — wiring, fiber, or a secondary shaft can run straight through the motor's rotational axis, simplifying the mechanical design around it. Five body lengths on the same NEMA 16 mounting footprint let a product line scale holding torque nearly 3x (0.16–0.45 N·m) without changing the bore diameter or mounting interface. Custom shaft bore diameter and length are available on request.
We can customize the electrical parameters of the motor and geometric dimensions such as the motor output shaft size according to customer requirements. Accessories including pulleys, eccentric gearboxes, planetary gearboxes and encoders can also be added. For more products and detailed specifications, please download the product catalog from the Download Center.
