Previous
Next
AW39HS Series — NEMA 16 Hybrid Stepper Motor
The AW39HS series is Apexwell's NEMA 16 (39mm) hybrid stepper motor line, offered across six body lengths from 20mm to 54mm. Holding torque scales from 0.086 N·m to 0.45 N·m — a 5.2x range — positioning this frame size between NEMA 14 (AW35HS) and NEMA 17 (AW42HS) 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) |
| 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 |
|---|---|---|---|---|---|---|---|
| AW39HS20-0474A | 20 mm | 0.47 A | 25 Ω | 22.1 mH | 0.086 N·m | 10.7 g·cm² | 0.12 kg |
| AW39HS34-0404A | 34 mm | 0.4 A | 30 Ω | 35 mH | 0.16 N·m | 26.5 g·cm² | 0.16 kg |
| AW39HS38-1004A | 38 mm | 1.0 A | 2.0 Ω | 3.7 mH | 0.23 N·m | 37.0 g·cm² | 0.21 kg |
| AW39HS44-1004A | 44 mm | 1.0 A | 6.0 Ω | 14.8 mH | 0.45 N·m | 46.0 g·cm² | 0.26 kg |
| AW39HS47-1004A | 47 mm | 1.0 A | 7.8 Ω | 17.0 mH | 0.45 N·m | 41.0 g·cm² | 0.30 kg |
| AW39HS54-1504A | 54 mm | 1.5 A | 2.3 Ω | 5.8 mH | 0.45 N·m | 55.6 g·cm² | 0.40 kg |
Typical Applications
The AW39HS's NEMA 16 footprint suits small CNC engraving axes, camera and lens positioning systems, medical pump actuators, and robotics joints where NEMA 14 doesn't have enough torque and NEMA 17 is larger than the design needs.
Why Choose the AW39HS Series
Six body lengths on one NEMA 16 mounting interface give a 5.2x torque range without changing the mechanical footprint — one of the widest torque spreads in Apexwell's small-frame stepper lineup. For applications where occasional step loss under load is a concern, see our article on why closed loop stepper motors are replacing traditional steppers to evaluate whether a closed loop configuration makes sense for your design. Custom shaft length and connector configurations 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.
